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  • Table of Content
      20 June 2017, Volume 41 Issue 3 Previous Issue    Next Issue
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    The basement tectonic characteristics from interpretation of aeromagnetic data in Xiong'an region
    YU Chang-Chun, QIAO Ri-Xin, ZHANG Di-Shuo
    Geophysical and Geochemical Exploration. 2017, 41 (3): 385-391.   DOI: 10.11720/wtyht.2017.3.01
    Abstract   HTML   PDF (5600KB) ( 345 )
    Xiong'an region is located in the plain thick coverage area,before Cenozoic lithology basement structure and tectonics is important basis of urban planning and development.In the paper,based on the aeromagnetic survey and airborne gamma-ray spectrometry survey results around the Xiong'an region and the surrounding in 1988,we rearranged the rock ore property, magnetic field and deduce the lithology structure map etc,analyzed the basement tectonics and the characteristics of oil and gas prospect area,and then presented the 3D lithologic structural diagram.It's state that the area of the deep crust structure is relatively stable.
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    Present situation and research progress of the SEDEX deposit
    ZHAI Yu-Lin, WEI Jun-Hao, LI Yan-Jun, LI Xiang, KE Kun-Jia
    Geophysical and Geochemical Exploration. 2017, 41 (3): 392-401.   DOI: 10.11720/wtyht.2017.3.02
    Abstract   HTML   PDF (1761KB) ( 295 )
    Sedimentary exhalative deposits (SEDEX) are an important kind of ore deposits, and provide about 60% of the lead and 50% of the zinc in the world. In this paper, based on consulting previous and the latest research achievements, reading relevant literatures and synthesizing the different theories, the authors summarize the ore-forming tectonic setting and geological characteristics and, in combination with S, Pb, H, O and B isotopes, discuss the sources of ore-forming materials and fluids in terms of geochemistry. Based on former metallogenic model, the authors further improve the mineralization mechanism. In the end, this paper describes the new research progress, and gives some suggestions for the existent problems and development trends in the future.
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    A discussion on the geochemical characteristics of stream sediments and ore-prospecting orientation in Weixing-Anquan area of Heilongjiang Province
    YIN Guo-Liang, LIANG Ke-Wei, YANG Fu-Shen, WEN Dan, Wang Yan
    Geophysical and Geochemical Exploration. 2017, 41 (3): 402-409.   DOI: 10.11720/wtyht.2017.3.03
    Abstract   HTML   PDF (2409KB) ( 226 )
    The Luming molybdenum deposit is located in Weixing-Anquan area of Heilongjiang Province, where stream sediments are well-developed. This paper introduces the popular statistical method which investigates the relationship between geochemical characteristics of stream sediments and mineralization. Some conclusions have been reached : ① Mo is most likely to form large deposits; Au may form ore deposits, but the size will not be large. ② Mo and Sb, Cu, Pb, Zn W belong to the same factor, and Mo has experienced multi-period mineralization; Au, Ag and As belong to the same factor. ③ The authors chose 4 mineralization prospective areas to study stream sediment anomaly and found a new Mo orebody, which suggests that this area has good ore-search prospects of Mo deposits.
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    The application of geochemical exploration to geological prospecting in Tianshuihai area of Western Kunlun Mountains
    XIE Yu, TAO Ling, LI Hui, XIE Xian-Gang, ZHAO Sen, ZHAO Tong-Shou
    Geophysical and Geochemical Exploration. 2017, 41 (3): 410-420.   DOI: 10.11720/wtyht.2017.3.04
    Abstract   HTML   PDF (4373KB) ( 268 )
    To make new breakthrough in lead-zinc exploration in the Qiao'er Tianshan-Chalukou lead and zinc ore concentration area of the Western Kunlun Mountains, the authors arranged 1:50 000 survey project of geochemical exploration based on the results of 1:500 000 stream sediment survey, and picked out the integrated anomalies of HS-10 and HS-27 which are mainly composed of Pb according to the anomalies delineated in 1:50 000 geochemical exploration. Then, together with the geochemical characteristics of the landscape and the results of 1:10 000 soil survey as well as the analysis of the geochemical characteristics of the main ore-forming elements, the distribution positions of lead orebodies were estimated. At last, according to the exterior and deep engineering verification, the Tianshuihai lead-zinc deposit and the Tianzhushan lead-zinc deposit were found. The experience gained from prospecting work in Tianshuihai area indicates that the means put forward by the authors will effectively improve the prospecting rate and shorten the period of exploration by paying attention to picking out regional geochemical anomalies, focusing on abnormity-testing step by step, and selecting the most favorable ore-forming position for geological survey and engineering revealing.
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    Aeromagnetic and aero-radioactive characteristics of the gold deposits in Changshanhao area
    DU Hua-Yu, LI Xiao-Lu, YANG Yu-Qin
    Geophysical and Geochemical Exploration. 2017, 41 (3): 421-428.   DOI: 10.11720/wtyht.2017.3.05
    Abstract   HTML   PDF (7783KB) ( 166 )
    The gold deposit possesses particular geophysical characteristics. On the basis of its characteristics and ore-forming geological environment,the authors point out the prospecting direction, thus improving the results and getting greater achievements in gold prospecting by using the geophysical survey data. The Changshanhao gold deposit occurs in dark slate in Baiyun Obo Group and belongs to metamorphic rock type gold deposit. Applying 1:50,000 aviation radioactivity measurement and aeromagnetic data, the authors obtained the aerial survey potassium content of 2.64%,uranium content of 2.65×10-6 and thorium content of 10.2~13.5×10-6 in mineralized dark slate layer of Bilute Group. Compared with the background value, the layer possesses "high uranium, high thorium, low potassium" characteristics. The high value information of total count rate, U and Th is closely related to the gold-forming environment. The aeromagnetic field in the gold deposit has high aeromagnetic anomaly zones in NE direction, and there exist superimposed magnetic anomalies in the range from 200 to 600 nT. Aeromagnetic information contains the hidden rock mass information which is related to and controls the gold deposit, and the prospecting work was conducted in the gold prospecting areas around the Changshanhao gold deposit by using the deposit characteristic method. 11 promising areas were delineated along the northeastward extension gold belt, thus obtaining satisfactory achievements in gold prospecting by using the geophysical survey data.
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    The application of ground magnetic measurement and borehole magnetic measurement to the exploration of the Lucaotan magnetite deposit
    LI Rong-Liang, REN Jie, TIAN Jian-Rong, LIU Yang
    Geophysical and Geochemical Exploration. 2017, 41 (3): 429-436.   DOI: 10.11720/wtyht.2017.3.06
    Abstract   HTML   PDF (3027KB) ( 216 )
    Through geological survey, the authors infer that there are more blind orebodies at the depth of the Lucaotan mining area, and hence it is necessary to carry out further exploration. Using the 1:1 million ground high-precision magnetic measurement, the authors delineated the magnetic anomalies, inferred and divided the geological structures. Through interpretation and study of the magnetic anomalies, the authors found the hidden magnetite orebody. By using the 2.5D human-computer interactive inversion technique the authors inferred that there exist hidden magnetic orebodies at the depth. Borehole magnetic measurement plays an important role in guiding drilling work. Practice has proved that the organic combination of ground magnetic measurement and borehole magnetic measurement in the exploration of the Lucaotan magnetite deposit has made significant prospecting effect.
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    The application of seismic exploration technology in the Kalatongke orefield
    LIU Jian-Xun, ZHOU Jian-Yong, XU Ming-Cai, WANG Xiao-Jiang, ZHANG Bao-Wei, LI Pei, ZHANG Kai, WANG Kai, GAO Jing-Hua, WANG Guang-Ke, CHAI Ming-Tao, RONG Li-Xin
    Geophysical and Geochemical Exploration. 2017, 41 (3): 437-444.   DOI: 10.11720/wtyht.2017.3.07
    Abstract   HTML   PDF (6484KB) ( 175 )
    Currently,deep mineralization has become an important object of mineral exploration.The deep mineralization is characterized by deep burial depth,weak mineralization and a low level of synthetic geological study.Such a situation influences to some extent the application of geophysical technology,and causes more difficulties in the exploration of deep mineral deposits.Seismic method for metallic ore exploration is a new and promising technique,which has such merits as great detecting depth and high detection accuracy.This exploration technology was applied to deep prospecting in the Kalatongke Cu-Ni deposit of Xinjiang,with the emphasis placed on the suppression of the background noise in data acquisition and processing.During the field seismic exploration,the acquisition method included such means as a large explosive excitation,a small detector spacing and higher stacking fold.The technique achieved good detection results,with some of the results verified by drilling.
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    The application of the induced polarization method to the replacement resources exploration of the Dongxi gold deposit
    ZHANG Xiao-Dong, FANG Jie, ZHANG Ding-Yuan, XIE En-Cai, LING Qi-Huai, SUN Ying, FENG Hai-Lin
    Geophysical and Geochemical Exploration. 2017, 41 (3): 445-451.   DOI: 10.11720/wtyht.2017.3.08
    Abstract   HTML   PDF (5404KB) ( 299 )
    The Dongxi gold deposit is the first primary gold deposit discovered in the eastern part of northern Huaiyang tectonic belt, and it is also the first gold deposit for industrial mining. There exists controversy concerning the problem whether the induced polarization measurement could be an effective method or not under the condition of the lack of sulfides in the ore. According to the analysis of apparent resistivity and apparent polarizability measurement, the authors found that the commonly used geophysical exploration technique is effective for the replacement resources exploration in the Dongxi gold deposit with low sulfide content. The apparent resistivity anomaly indicates the auriferous quartz (carbonate) veins, and the apparent polarization anomaly might indicate dikes and fault structures related to the mineralization. The induced polarization measurement provides strong evidence for exploration of ore-controlling structure and drilling engineering implementation.
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    Geochemical exploration of natural gas hydrate in mud volcano area of the Qiangtang Basin
    YANG Zhi-Bin, ZHOU Ya-Long, SUN Zhong-Jun, ZHANG Fu-Gui, ZHANG Shun-Yao, LI Guang-Zhi
    Geophysical and Geochemical Exploration. 2017, 41 (3): 452-458.   DOI: 10.11720/wtyht.2017.3.09
    Abstract   HTML   PDF (5251KB) ( 158 )
    Mud volcano is one of the signs of gas hydrate, and it is the main evidence for the existence of natural gas hydrate. The permafrost area in Qiangtang basin has developed a lot of mud volcanoes, the geochemical exploration of mud volcanoes shows that acidolysis hydrocarbon and fluorescence spectra, carbonate, altered carbonate and trace elements geochemical indices are abnormal in mud volcanoes, and methane carbon isotope and three-dimensional fluorescence analytical results show that hydrocarbon geochemical anomalies of crude oil are genetically related to associated gas and condensate oil formation, and that the peripheral area of mud volcano exhibits hydrocarbon enrichment, formed by the leakage of oil and gas reservoir. The results obtained by the authors are of important significance for gas hydrate exploration breakthrough in Qiangtang basin.
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    The recognition and extraction of Au, Cu geochemical composite anomalies:A case study of the east of Laji Mountains
    JIANG Xiao-Jia, CHEN Xin, ZHENG You-Ye, GAO Shun-Bao, OUYANG-Song, ZHANG Yong-Chao, ZHENG Lei, HUANG Jian
    Geophysical and Geochemical Exploration. 2017, 41 (3): 459-467.   DOI: 10.11720/wtyht.2017.3.10
    Abstract   HTML   PDF (3554KB) ( 236 )
    In order to weaken the closure effect of the geochemical data which serve as typical component data, the authors analyzed the spatial distribution of geochemical elements in the Laji Mountains. The authors used the isometric log-ratio(ilr) transformation to "open" the geochemical data of the water sediments, built the combined model using robust principal component analysis (RPCA) to identify the combined geochemical anomalies and employed fractal filtering technique to strengthen weak anomalies and separate anomaly from background. In this way, the authors delineated geochemical anomaly so as to guide mineral exploration better. The result obtained by using RPCA displays two different compositional assemblages: (I) Au-As, probably representing tectonic-altered rock type gold deposit like the east ditch of Jinyuan, and (II) Cu-Ni, likely representing copper-nickel sulfide mineralization such as Lashuixia. The results from S-A filter technique can decompose anomalies further, strengthen weak anomaly and reduce the abnormal area in the strong background and, in combination with the geological survey of the study area and the anomaly map, can better search for tectonic-altered rock type Au-As deposits and Cu-Ni sulfide mineralization.
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    Mapping techniques for the World Digital Magnetic Anomaly Map (WDMAM)
    DU Jin-Song, CHEN Chao, LIANG Qing
    Geophysical and Geochemical Exploration. 2017, 41 (3): 468-477.   DOI: 10.11720/wtyht.2017.3.11
    Abstract   HTML   PDF (5291KB) ( 187 )
    As a basic map of the Earth's global geophysical fields, the World Digital Magnetic Anomaly Map (WDMAM) aims at serving education, industry and science. Especially, the global coverage of the map makes possible world-wide comparative researches and global systematic studies of geosciences. Realizing original data sources, processes and distributions of resolution and reliability of the WDMAM is certainly very important and helpful to correctly and properly using this data set in actual applications. Therefore, in this paper, the authors introduce the background, scientific significances and form of the map, present the basic principles of mapping, analyze the corresponding techniques, and deal with the mapping progress. On such a basis, the authors summarize the current bottlenecks and difficulties as well as some points which should be further improved. In addition, the authors correspondingly propose the possible development approaches of the future mapping and provide some basic references for compiling the worldwide magnetic anomaly data by China's experts.
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    A further discussion on the boundary of North China Platform's north margin based on time-domain airborne electromagnetic data
    SUN Dong-Hua, LI Huai-Yuan, JIANG Min-Zhong, WANG Pei-Jian
    Geophysical and Geochemical Exploration. 2017, 41 (3): 478-483.   DOI: 10.11720/wtyht.2017.3.12
    Abstract   HTML   PDF (5163KB) ( 160 )
    The north margin of North China Platform, which possesses very rich mineral resources, is one of the important mineral producing areas in China. However, its boundary with the geosyncline folded system in central Inner Mongolia has not been confirmed,and researchers have debated this problem for a long time. To get a specific definition, the authors made a detailed research on Dachaoyangou area which is located in the south of Wengniute County on the north margin of North China Platform. A large scale geological survey was completed using the VTEM system, and high precision time-domain airborne electromagnetic data were obtained. With these data, the authors analyzed the electromagnetic response, time constant characteristics and the variation regularity of apparent electrical resistivity. The boundary extends along the line from east to west, exhibiting a northward protruding arc in the plane. Its interface overall leans outward with the angle 50 ° to 70 °, and it first leans inward and then outward, showing S-shaped twisting down. Objectively, the conclusions of this paper are conducive not only to the study of regional tectonics but also to the mineral resources exploration within the area.
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    Research on the measurement of interfacial polarization voltage by the extrapolation method
    MO Wan-Ling, SUN Zhong-Hua, XU Ya, ZHAO Bin
    Geophysical and Geochemical Exploration. 2017, 41 (3): 484-488.   DOI: 10.11720/wtyht.2017.3.13
    Abstract   HTML   PDF (830KB) ( 339 )
    It is of practical value to measure the interfacial polarization voltage for improving the sensitivity of BEAM advanced detection method used in TBM tunnel. However, it is difficult for conventional methods to measure the interfacial voltage between solid rock mass and electrode accurately. In order to measure the interfacial voltage, the authors propose an extrapolation measurement method in this paper. The proposed method consists of a sample tube and a number of equally spaced electrodes. Sinusoidal alternating current is exerted on both sides of the sample tube. The AC complex voltages of every electrode are measured. According to the geometrical relationship between the electrodes, the interface voltage of the two power supply electrodes can be obtained by extrapolation. Experimental results indicate that the interfacial polarization voltage between clay and metal electrode can be successfully measured by the proposed method. When abnormal body such as charcoal or water hole exists in the sample tube, the polarization rate change of the measured rock-soil can be greatly raised by subtracting the interfacial polarization voltage from the total voltage. Therefore, the sensitivity of tunnel advance detection can be improved by this method.
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    High-order FDTD method for multi-offset electromagnetic numerical imaging
    WANG Ke
    Geophysical and Geochemical Exploration. 2017, 41 (3): 489-495.   DOI: 10.11720/wtyht.2017.3.14
    Abstract   HTML   PDF (1874KB) ( 137 )
    Numerical simulation is an important part of data processing and inversion interpretation. In order to improve the efficiency and the accuracy of electromagnetic wave imaging technology in engineering survey, it is important to understand the propagation characteristics of electromagnetic waves by forward modeling. In this study, the finite-difference time-domain FDTD (2, 4) was used to simulate the numerical imaging of electromagnetic waves in three kinds of geoelectric models, i.e., karst caves, faults and boulders. The multi-offset mode was used to acquire the electromagnetic wave gathers. Based on the analysis of the electromagnetic wave wavefield and the waveform profile, the authors summarized the propagation law of electromagnetic waves in different geological bodies and provided reliable basis for practical engineering investigation. The experimental results show that FDTD (2, 4) can simulate the numerical imaging of electromagnetic waves in complex media with high accuracy, and also prove that the multi-offset acquisition mode has high efficiency and flexibility.
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    Three-dimensional finite difference time domain simulation for down-hole transient electromagnetic method
    XU Xin-Gang, XU Zheng-Yu
    Geophysical and Geochemical Exploration. 2017, 41 (3): 496-504.   DOI: 10.11720/wtyht.2017.3.15
    Abstract   HTML   PDF (1987KB) ( 139 )
    As one of the effective methods used in geological prospecting, the down-hole transient electromagnetic method is a geophysical survey method in search for mineral resources, which measures the transient electromagnetic field in a borehole by placing the receiving coils in the borehole. In this paper, based on time domain finite difference algorithm, the authors used a loop source and non-uniform gird, developed a 3D simulation program, and simulated the response of the uniform medium half space, inclined conductor, and inclined conductor with overburden. According to the comparative analysis, the maximum value of response decreases with delay time in uniform half space; in the early period of transient electromagnetic survey, it mainly reflects the response of the surrounding rock; in the late period, abnormal response of the conductor can be obviously displayed. When the source is in the central position, the abnormal response conductor can be reflected, and when the source is in the right position, the need to extend the observation time can be observed in response to abnormal conductor. The impact on overburden conductor is reflected in the entire observation time, making the abnormal response of the conductor ambiguously displayed. The authors studied the work and provide the reference for the down-hole TEM abnormal response characteristics and data interpretation.
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    Electrical resistivity imaging inversion based on support vector regression
    DONG Li, JIANG Fei-Bo, DAI Qian-Wei, FU Yu-Hang
    Geophysical and Geochemical Exploration. 2017, 41 (3): 505-512.   DOI: 10.11720/wtyht.2017.3.16
    Abstract   HTML   PDF (3445KB) ( 126 )
    Support Vector Regression is a Learning Machine based on statistic learning theory. It has better performance of generalization and fitting precision than traditional neural network inversion under the condition of small samples learning. Under the application background of electrical resistivity imaging, SVR inversion method based on limited learning samples was studied in this paper. The key issues of sample division and data preprocessing, inversion flow and evaluation indicators were analyzed. A multi-parameter optimization method based on cross validation was presented. The optimized SVR inversion model by comparing the influence of RBF kernel functions with different ε values with the inversion results was established. Data simulation and model inversion show that the proposed inversion method has better inversion accuracy and imaging quality than traditional least squares inversion and RBFNN inversion, and is equivalent to BPNN, but it has disadvantage of only one output dimension.
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    The multi-criteria velocity analysis of seismic data
    XIE Jun-Fa, SUN Cheng-Yu, WANG Xing-Mou, LI Hong-Mei, LIN Mei-Yan
    Geophysical and Geochemical Exploration. 2017, 41 (3): 513-520.   DOI: 10.11720/wtyht.2017.3.17
    Abstract   HTML   PDF (4941KB) ( 181 )
    Velocity analysis is a key procedure of the seismic data processing,the conventional velocity analysis method scans with a series of given velocities with the same interval,and makes velocity spectrum based on the criteria of stacking power,semblance coefficient and so on.The energy groups of conventional velocity spectrum are usually divergent at the right NMO correction velocity,which affects the velocity pick up.A variance velocity method is studied and its velocity spectrum has higher precision since variance is relatively sensitive to the coherence of the events.The scanning velocity corresponding to the minimum values of the covariance velocity spectrum is picked up as the NMO correction velocity.However,due to the high precision,the area corresponding to the minimum variance value is too small in actual data processing,which is unfavorable for velocity pick up.In view of such a situation,the authors proposed a multi-criteria velocity analysis method regarding the production of variance, stacking power and semblance coefficient as the objective function.Noise will affect the variance by increasing its overall value but does not change its relative value relation.This method can also be applied to the seismic data with certain noise consequently.The authors have proved the correctness and effectiveness of the method by model data and actual data processing.
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    The blind separation denoising method for surface array micro-seismic data
    DIAO Rui, WU Guo-Chen, SHANG Xin-Min, RUI Yong-Jun, CUI Qing-Hui
    Geophysical and Geochemical Exploration. 2017, 41 (3): 521-526.   DOI: 10.11720/wtyht.2017.3.18
    Abstract   HTML   PDF (6681KB) ( 231 )
    Due to the ground noise interference,the signal-to-noise ratio(S/N ) of original micro seismic monitoring data is relatively low,and the data quality determines the positioning accuracy of micro seismic events.Therefore,it is very important to improve the S/N of monitoring data in the processing of micro-seismic event.Based on the advantages of more monitoring sites,short intervals and wide distribution in ground array,the method of blind source separation based on cross-correlation method can denoise random noise.Blind source separation method is based on cross-correlation method,which uses negentropy as the objective function,with particle swarm optimization method for high efficiency solving.Through the cross correlation coefficient to solve the uncertainty problem of blind source separation,the method can realize effective separation of the ground array micro seismic events components and noise interference components.Through the forward simulation signal and the actual ground array micro-seismic data processing,the method was effectively applied to enhancing S/N of the ground array micro seismic data,which confirms that the method is feasible and effective.
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    The application of comparing difference of power spectrum estimated from separated time window to predicting oil-bearing capability of channel sand
    BI Jun-Feng
    Geophysical and Geochemical Exploration. 2017, 41 (3): 527-534.   DOI: 10.11720/wtyht.2017.3.19
    Abstract   HTML   PDF (11569KB) ( 94 )
    The absorption and attenuation attributes based on spectrum characteristic analysis are primary references in the poststack domain.Because there exist some problems in the process of detection using conventional spectrum analysis technique,improvements were done in the analytical method and spectrum estimation algorithm.The technique of comparing differences of power spectrum estimated from separated time window emerges as the times require.On the basis of setting up time window up and down concentrated development segment of the oil layer,power spectrum is obtained from seismic signal by ARMA model.Thus,the difference of spectrum subsequently is obtained to predict oil-bearing capability qualitatively by comparing the differences of power spectra in corresponding window.Also,this paper introduces the calculation procedure,analytical method and algorithm advantage.It is shown that the technique has a high sensitivity and satisfactory prediction effect of oil-bearing capability,as shown by model testing and actual application to Nm Formation in the west of Chengbei fault zone.
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    A study of the method of well controlled high precision variable velocity mapping in the subsalt complex structure area of Gabon
    ZHANG Jun
    Geophysical and Geochemical Exploration. 2017, 41 (3): 535-541.   DOI: 10.11720/wtyht.2017.3.20
    Abstract   HTML   PDF (4438KB) ( 156 )
    With the deepening of oil and gas field development,seismic data interpretation and structural mapping accuracy requirements are also increasing.Especially in complex surface,underground complex and steep dip formation regions,high-precision velocity field must be established with variable velocity mapping to obtain a fine structure diagram and fine implementation of construction.However,in the complex structure area,it is difficult to get an accurate structural model with the conventional velocity models,because speed change is very big also in the vertical and horizontal direction.Based on the study of currently used velocity modeling techniques for complex area,the authors put forward the technical method about seismic and logging constrained 3D velocity model that takes full advantage of unified corrected wells velocity,seismic velocity spectrum and other information and,combined with layers control action,finally uses the time depth conversion to realize the structural mapping.Research on the technology for the construction of onshore Gabon Zone salt has achieved good results.
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    The application of casing damage monitoring technology in Ordos basin
    BAI Bin-Yan
    Geophysical and Geochemical Exploration. 2017, 41 (3): 542-549.   DOI: 10.11720/wtyht.2017.3.21
    Abstract   HTML   PDF (8993KB) ( 112 )
    With the development of oil and gas fields, oil casing deformation, damage and corrosion problems caused by various factors have seriously affected the normal production of oil and gas. Electromagnetic inspection of MID-K and multi-arm caliper logging technology used by North China Engineering Logging Branch in casing damage monitoring can not only estimate oil casing deformation characteristics and confirm the degree of corrosion damage of pipe wall but also check the well limb structure, evaluate the speed of casing damage and predict the casing life. At present, the technology is widely used in many blocks such as Daniudi, Mahuangshan, Hangjinqi and Xinjiang and has been successfully used in more than 70 wells. Engineering problems in production wells like well leakage, column deformation and oil casing deformation, damage, corrosion and crust are effectively solved. Significant effects have been proved in comprehensive treatment of damage parts in such aspects as oil casing, remoulding and improving oil and gas well production capacity, enhancing the service life of oil casing and reducing the workover cost.
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    Automatic clipping of maps and producing of legends based on secondary development of MapGIS
    HE Hai-Yang, SHEN Zheng-Xin, AN Zheng-Wei, QIU Chong-Tao
    Geophysical and Geochemical Exploration. 2017, 41 (3): 550-555.   DOI: 10.11720/wtyht.2017.3.22
    Abstract   HTML   PDF (981KB) ( 234 )
    As one of geographic information systems, MapGIS software has been widely applied in geological field in China, which not only has powerful function in map drawing but also provides the secondary development library for users. The forms of expression in geological map and the requirements of legend producing are introduced briefly in this paper. On the basis of components of MapGIS software and according to the map's features of airborne geophysics survey, the authors present the new solutions using C Sharp programming language for rapid maps clipping, legends producing and design and some other work. As a result, the artificial errors are reduced effectively and then the drawing efficiency is raised by multi-times. The key techniques and the codes about components of MapGIS are described in detail.
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    Aircraft type selection for airborne geophysical exploration in super-high plateau and flight performance analysis
    WANG Jin-Long, XIE Ru-Kuan, LIANG Ren, SONG Yan-Bing, LIU Zhi-Qiang, LI Jian, SHAN Xi-Peng
    Geophysical and Geochemical Exploration. 2017, 41 (3): 556-559.   DOI: 10.11720/wtyht.2017.3.23
    Abstract   HTML   PDF (735KB) ( 213 )
    Aircraft landing and flying in super-high plateau area has its special characteristics. Based on the analysis of the characteristics of the geographical environment, climate and the airborne geophysical exploration in the super-high plateau area, the authors put forward the principle of aircraft type selection. The main performance of King Air 350ER aircraft and that of other aircrafts were comparatively studied. The flight performance of King Air 350ER in the eastern region of Tibet was analyzed. The results show that the King Air 350ER meets the requirements of airborne geophysical exploration in super-high plateau area.
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    Disturbance identification and disposal of magnetic diurnal variation in aeromagnetic survey
    WANG Wei-Ping, WANG Qi, WU Cheng-Ping, JIN Long-Zhe, ZHANG Lin-Jie
    Geophysical and Geochemical Exploration. 2017, 41 (3): 560-563.   DOI: 10.11720/wtyht.2017.3.24
    Abstract   HTML   PDF (2055KB) ( 162 )
    In this paper, the authors have analyzed and compared the diurnal variation curves in several survey areas, studied the curves and their disturbance features of magnetic diurnal variation in different places, and summarized magnetic diurnal variation curve features of other external disturbance and curvilinear distortion of instrument reasons. Based on comprehensive analysis and research, the authors have summarized the curve features of magnetic disturbance, external disturbance and instrumental interference, and provided the basis for quick identification of magnetic disturbance and correct editing and processing of magnetic diurnal variation data.
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    A path planning method of UAV for aerogeophysical survey
    XIAO Du, LI Jun-Feng
    Geophysical and Geochemical Exploration. 2017, 41 (3): 564-569.   DOI: 10.11720/wtyht.2017.3.25
    Abstract   HTML   PDF (1135KB) ( 410 )
    This paper presents a three-dimensional automatic path planning method, which is used to solve the problem of autonomous navigation of UAV (Unmanned Aerial Vehicle) under the condition of complex topography in high-precision aerogeophysical survey. With the survey path coordinates and DEM (Digital Elevation Model) data as the input, on the basis of climb rate of the UAV, and by the climbing rate adjustment, cutting line adjustment, rarefying and fitting processing, this method get the matching surface elevation data with the UAV climbing capability, and it could be used to extract 3D path data for autonomous navigation. Simulation and test results show that the path data acquired by this method not only guarantee the flight safety but also have certain terrain following effects, thus creating favorable conditions for high precision aerogeophysical survey with UAV.
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    Health risk assessment of geochemical environment n the water and soil system of Huanghua region
    XU Shan
    Geophysical and Geochemical Exploration. 2017, 41 (3): 570-576.   DOI: 10.11720/wtyht.2017.3.26
    Abstract   HTML   PDF (3349KB) ( 173 )
    To analyze and evaluate the risk of the serious pollution of the elements in soil, grain and water of Huanghua region, the authors delimited the risk management zoning and put forward the countermeasures. According to the elements that exceed the standards in soil, grain and water, the authors selected eleven primary elements as indicators, which were Cd, Cu, Hg, Pb, Zn, As, Ni, F, I, Se, and Cr. The exposure dose model based on daily human intake of unit weight (CDI) was developed, and the risk level was graded by risk quotient method. The risk management zoning was delimited by superimposing risk areas of indicators. The results show that the HQ values of F are all higher than 1 in eleven indicators. The HQ values of I that are higher than 1 reaches 52%. The HQ values of the elements are almost all smaller than 1 except for Pb: only one Pb sample has HQ value higher than 1. The comprehensive high-risk areas are located in the southwest of Huanghuain Changguo-Jiucheng-Yangerzhuang area, and the second high-risk areas are located in the north of Qijiawu and Nanpai River, with the risk caused by groundwater.
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    The application of the ground penetrating radar (GPR) to the detection f ruins of ancient tombs
    ZHU Nan-Nan, LI Jia-Cun, YE Pei-Sheng
    Geophysical and Geochemical Exploration. 2017, 41 (3): 577-582.   DOI: 10.11720/wtyht.2017.3.27
    Abstract   HTML   PDF (6772KB) ( 419 )
    Ground penetrating radar is a non-destructive detection technology characterized by rapid data acquisition and image visualization, and hence it has been used more and more in the exploration of underground archaeological remains. With the tomb group in Tongzhou District as the study object, the authors first did work on tomb which had been discovered but remained to be excavated, analyzed the characteristics of typical abnormal GPR images in the tomb, studied abnormal characteristics so as to analyze other unknown area of the tomb in the working district and find out the characteristic tomb reflection anomaly area in the image. Verification was did with Luoyang shovel. The results of the ground penetrating radar detection are consistent with the results of the actual excavation. The practice shows that the ground penetrating radar technology is effective in the detection of the site of the ancient tomb.
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    The application of transient electromagnetic method to the military shooting range
    ZHAO Zhao, FAN Tao, WANG Ji-Kuang
    Geophysical and Geochemical Exploration. 2017, 41 (3): 583-586.   DOI: 10.11720/wtyht.2017.3.28
    Abstract   HTML   PDF (1924KB) ( 272 )
    During the military shooting range target practice or routine test, a large amount of metal elastomer is likely retained in the soil surrounding the shooting range, which is not easy to find, and this will lead to cost and other safety issues. To solve this problem, this paper proposes a means to detect the lost metal elastomer with the transient electromagnetic method. Theoretical and case analysis of the transient electromagnetic technology was performed in finding lost elastomer in the military shooting range, and the results show that the detection is satisfactory.
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