Loading...
E-mail Alert Rss
 
Office Online
News
gfff
More>>
Information
Sponsored by:
China Aero Geophysical Survey and Remote Sensing Center for Natural Resources
Edited by:
Editorial Office of Geophysical and Geochemical Exploration
Add:
29 Xueyuan Road, Beijing 100083,China
Tel: 86-010-62060192/62060193
Fax: 86-010-62060193
Email: whtbjb@sina.com
Web: http://www.wutanyuhuatan.com
Editor in Chief: XIONG ShengQing
Published by:
The Geological Publishing House (31 Xueyuan Road,Beijing 100083,China)
Printer:
Beijing Changning Printing Co. Ltd.
Distributor: Beijing Post Office
Abroad Distributor:
China International Book Trading〖DW〗Corporation
Subscription Hander:
Local Post Offices of China
Links
More>>
  • Table of Content
      10 December 2009, Volume 33 Issue 6 Previous Issue    Next Issue
    For Selected: View Abstracts Toggle Thumbnails
    wutanyuhuatan
    MINERALOGICAL CHARACTERISTICS AND MATERIAL SOURCE OF POLYMETALLIC NODULES IN CC AREA OF EAST PACIFIC
    LI Guosheng
    Geophysical and Geochemical Exploration. 2009, 33 (6): 613-619.  
    Abstract   HTML   PDF (789KB) ( 802 )

    Based on submarine geological sampling in CC area of East Pacific and using such geophysical methods as the experimental analysis of photographs and the multifrequency detection, this paper deals with main types, abundance and coverage, taste, chemical composition and distribution of nodules in CC area. Based on studying such factors as sedimentation, biological function, submarine volcanoes, chemical composition and Antarctic waters, the authors revealed the material source of the nodules. According to an integrated analysis of the geological background and the landform, this paper further discusses the formation environment of the nodules. On such a basis, a metallogenic model has been established.

    Related Articles | Metrics
    A SYSTEMATICAL EVALUATIONOF THE REGIONAL GEOCHEMICAL ENVIRONMENT OF GEJIU AREA
    ZHOU Yu-Guo, GAO Qi-Zhi, LIU Ji-Shun, MA Hui-Ying, HUANG Yuan-You
    Geophysical and Geochemical Exploration. 2009, 33 (6): 620-625.  
    Abstract   HTML   PDF (615KB) ( 635 )

    This paper deals in detail with the regional geochemical environment of Gejiu area in Yunnan Province on the basis of

    regional geochemical data combined with achievements obtained in such aspects as medical geology, agricultural geology and

    environmental geology. Fuzzy comprehensive assessment (FCA) was used to evaluate the regional geochemical environment over 630

    km2 of Gejiu area. It is concluded that the regional geochemical environment of Gejiu area has been polluted severely, resulting

    not only from the disadvantageous natural environment but also from the pollution of local factories. The situation deserves

    serious attention.

    Related Articles | Metrics
    GEOCHEMICAL CHARACTERISTICS AND ORE SEARCH PROSPECTS OF PUCHIYA AREA IN TIBET BASED ON STREAM SEDIMENT SURVEY
    XIA Xiang-Biao, ZHENG Lai-Lin
    Geophysical and Geochemical Exploration. 2009, 33 (6): 626-629.  
    Abstract   HTML   PDF (336KB) ( 824 )

    This preliminary study of the geochemical features in Puchiya area, Xaitongmoin, Tibet, was based on the 1∶50 000

    stream sediment survey. It included element distribution characteristics, element anomalies, element correlation and element

    anomaly assemblage. The result shows that the study area might be a prospective area for Pb, Zn and Cu. It is inferred that ore

    deposits in Puchiya area are probably volcanic type lead-zinc polymetallic deposits and acidic intrusive-associated porphyry

    copper polymetallic ore deposits. The Zhanzanmubu area is expected to be a prospective area for volcanic type lead-zinc

    polymetallic deposits and the Seyao area is likely to have copper polymetallic ore deposits associated with intermediate-acidic

    intrusive rocks.

    Related Articles | Metrics
    THE APPLICATION OF INTEGRATED GEOPHYSICAL EXPLORATIONTECHNIQUE TO THE STUDY OF COMPLEX STRUCTURES IN BOGEDA PIEDMONT ANCIENT GRAZING AREA
    SUO Xiao-Dong
    Geophysical and Geochemical Exploration. 2009, 33 (6): 630-634.  
    Abstract   HTML   PDF (984KB) ( 787 )

    The ancient grazing area on the southern margin of Junggar Basin has abundant oil and gas exploration potential;

    nevertheless, due to the existence of blind areas in medium and deep layer seismic imaging, the structural characteristics of

    this area remain unclear, which has restricted  the oil and gas exploration process. Using high-precision gravity and magnetic

    and electrical CEMP integrated geophysical technique, the author studied the structural characteristics of the ancient grazing

    area and obtained valuable new understanding. The results show that the structure of the ancient grazing area is the front

    structure of Bogeda piedmont folded thrust zone. Controlled by step fault, the ancient grazing area is longitudinally

    characterized by multi-layer structure, in which the shallow layer is tight type thrust overturned anticline, the medium layer is

    ridgeshaped fault block controlled by step thrust, and the deep layer is thrust anticline covered by buried hill. Gravity

    anomaly has revealed that the western pericline of the ancient grazing anticline is probably a complete anticline structure. The

    medium and deep structure of the ancient grazing area and the western pericline seem to be favorable targets for oil and gas

    exploration.

    Related Articles | Metrics
    THE EXPERIMENTAL APPLICATION OF THE HIGHDENSITY ELECTRIC METHODTO THE DETECTION OF UNDERGROUND OYSTER BIOHERM
    CAI Yun-Sheng
    Geophysical and Geochemical Exploration. 2009, 33 (6): 635-637.  
    Abstract   HTML   PDF (685KB) ( 680 )

    Through an analysis and study of the composition of individual oyster bodies in the coastal area of Tianjin and

    according to obvious resistance difference between the oyster body and the wall rock, the author adopted the high-density

    electric method to conduct the detection. Compared with other techniques, this method is characterized by high efficiency,

    rapidness and accuracy. With the inspection of a few drill holes, this method can attain the aim of both realizing largearea

    survey and reducing exploration expenses.

    Related Articles | Metrics
    SEISMIC FACIES ANALYSIS OF DAMOGUAIHE FORMATION IN THE SOUTH OF WUERXUN EPRESSION
    ZHANG Ming-Xue, LIU Shu-Fen
    Geophysical and Geochemical Exploration. 2009, 33 (6): 638-641.  
    Abstract   HTML   PDF (2459KB) ( 763 )

    Wuerxun depression is the main oil exploration objective in Hailar basin. Based on the sequence stratigraphy, this

    paper deals in detail with the seismic facies in Wunan area, where the distribution of drill holes is concentrated and the

    characteristics of seismic reflection are clear. In combination with the characteristics of seismic reflection events of

    configuration on the time section,the authors made an integrated interpretation of the interval structure,continuity,

    oscillation amplitude and other seismic facies for the seismic data from Wunan area of Wuerxun depression. Seven kinds of main

    seismic types with indicative significance are summed up. According to the characteristics of the seismic facies and in

    combination with structural background and drilling information,this paper describes the distribution of depositional system and

    points out that the sharp sandstone surface seems to be the favorable reservoir.

    Related Articles | Metrics
    GEOCHEMICAL CHARACTERISTICS AND TECTONIC ENVIRONMENT OF YAOWUGOU GRANITE PORPHYRY
    OU Yang-Hai-Song, LIU Shan, HU Xiang-Zhao
    Geophysical and Geochemical Exploration. 2009, 33 (6): 642-645.  
    Abstract   HTML   PDF (535KB) ( 905 )

    Located in Taibus Banner of Inner Mongolia, the Yaowugou stock is a granite porphyry assuming a north-south spheroidal

    form. The rock has porphyritic texture, and the minerals are mainly quartz, plagioclase, plagioclase and subordinately biotite.

    As for chemical components, SiO2 is slightly lower than the average SiO2 value of granites, potassium is rich but sodium is poor,

    FeO and CaO are very low, and aluminum is oversaturated. The rock has high differentiation index and high total REE. The values

    of LREE are by far higher than the values of HREE, with a very weak negative Eu anomaly. All this indicates that the Yaowugou

    stock should be genetically a S-type granite.

    Related Articles | Metrics
    GEOCHEMICAL PROGNOSTIC INDICATORS FOR THE XIAOTIESHAN CONCEALEDPOLYMETALLIC DEPOSIT IN GANSU PROVINCE
    LIU Chong-Min, MA Sheng-Ming, ZHU Li-Xin, LIANG Sheng-Yue, LI Bing
    Geophysical and Geochemical Exploration. 2009, 33 (6): 646-651.  
    Abstract   HTML   PDF (874KB) ( 749 )

    The Xiaotieshan concealed polymetallic deposit is genetically a submarine volcanic eruptive-sedimentary deposit. Its

    orehosting strata contain fairly abundant Cu, Zn, Ba, Ag and Co. Within the ore field and the ore deposit, these elements form

    distinct primary anomalies, which are superimposed on the mineralization sector. In the extending direction of the ore body, the

    distribution and association of the primary anomalies assume axial zoning, with the frontal elements being I, Na2O, Li, the

    elements closely associated with the ore body being Cu, Zn, Hg, Au, Pb, Ag, Bi, Sb, As, and the rear elements being Cd, Mo, Co,

    Sn. From the upper part of the ore body to the rear part,[(w(Na2O)×w(Li)]/[w(K2O)×w(Rb)] decreases regularly. The

    element association in the hanging wall is obviously different from that in the lying wall: the hanging wall is enriched with

    siderophile elements, while the lying wall has abundant thiophile elements. These indicators are surely of some significance in

    the evaluation of anomaly prospects and mineralization-denudation extent.

    Related Articles | Metrics
    THE APPLICATION OF GEOCHEMICAL SOIL SURVEY TO THE QAGANQULU Ag-Pb-Zn POLYMETALLIC ORE DISTRICTIN DONG UJIMQIN BANNER, INNER MONGOLIA
    WANG Qiu-Yin, CHENG Hua-Sheng, ZHU Mei-Hua, YAN Xiao-Hui, LI Jie
    Geophysical and Geochemical Exploration. 2009, 33 (6): 652-656.  
    Abstract   HTML   PDF (1150KB) ( 1166 )

    A great number of geochemical anomaly zones and prospecting target areas were found by geochemical soil survey in Dong

    Ujimqin Benner, Inner Mongolia, most of which are related to polymetallic ore deposits with great prospecting potential. In

    Qaganqulu, for example, three prospecting targets were defined and, with limited amounts of trenching work, a pay grade Ag-Cu-Pb

    ore deposit was discovered. These achievements show that the method of geochemical soil survey can yield favorable prospecting

    effect in hill areas.

    Related Articles | Metrics
    THE APPLICATION OF THE METHOD FOR INTERPRETATIONOF MAGNETIC ΔT ANOMALIES IN THE LOW MAGNETIC LATITUDEAREA TO GOLD ORE PROGNOSIS IN TANZANIA
    LI Shui-Ping
    Geophysical and Geochemical Exploration. 2009, 33 (6): 657-659.  
    Abstract   HTML   PDF (560KB) ( 1075 )

    Situated in a low magnetic latitude area, Tanzania lies in a horizontally magnetized environment. The characteristics

    of ΔT anomalies caused by magnetic bodies in this area differ greatly from those in the middle magnetic latitude area of

    mainland China. Based on the application and study of the measured data, the authors put forward the interpretation train of

    thought and a "phase reversal 180°" interpretation method for ΔT anomalies in the low magnetic latitude area and applied

    approaches to the interpretation of magnetic ΔT anomalies in a mid-high latitude. The application and study of the measured data

    show that the effect of the interpretation is consistent fairly well with practical geological situation.

    Related Articles | Metrics
    THE ELECTRIC PROSPECTING WORK FOR UNDERGROUND WATER IN AFRICA
    YANG Hong-Zhang
    Geophysical and Geochemical Exploration. 2009, 33 (6): 660-662.  
    Abstract   HTML   PDF (562KB) ( 867 )

     This paper describes the electrical prospecting work for groundwater water in the igneous rock area of Nigeria, Africa, and summarizes characteristics of electrical sounding curves of groundwater in that area. It is shown that the branch tailrace tunnel of the resistivity rises at 45°, the turning point corresponding to AB/2 is larger than or equal to 38 m, and the turning point of the resistivity curve is less than 30 m,with obvious induced polarization rate anomalies.

    Related Articles | Metrics
    DATA PROCESSING TECHNIQUE FOR DUAL-PROBE HEAT-PULSE METHOD TO DETERMINE THERMAL CONDUCTIVITY OF MARINE SEDIMENTS
    LI Guan-Bao, LIU Bao-Hua, DING Zhong-Jun
    Geophysical and Geochemical Exploration. 2009, 33 (6): 663-667.  
    Abstract   HTML   PDF (753KB) ( 705 )

    Dual-Probe Heat-Pulse method was modified for application of determining in-situ thermal conductivity of marine

    sediments. It was crucial to process DPHP data and extract thermal conductivity from these data. A processing flow was

    established based on measured data with consideration of the specific measurement situations at sea. The pre-processing

    procedure, including filtering, trimming, and ambient temperature fitting and eliminating, was suggested in order to obtain a

    temperature response curve of heat pulse, which was then utilized to calculate thermal conductivity. Besides the K-B model, a

    simplified model to calculate thermal conductivity was advanced which has advantage in reducing operation and cumulative error.

    By comparing the two thermal conductivity calculation methods, extremum method and fitting method, it was proposed that the

    extremum method will be the first choice so long as the sampling rate was high enough.

    Related Articles | Metrics
    EVALUATING WATERFLOODED FORMATION WITH HIGH SALINITY WATER BY THE LOGGING TECHNOLOGIES OF NUCLEAR MAGNETIC RESONANCE AND DUAL FREQUENCY RESISTIVITY
    TANG Yong-Mei, ZOU Chang-Chun, QIN Fei-Li, LI Feng-Qin
    Geophysical and Geochemical Exploration. 2009, 33 (6): 668-673.  
    Abstract   HTML   PDF (1159KB) ( 880 )

    The original salinity of formation water is high in Zhongyuan oil field. The salinity of injected water is usually

    lower than original salinity. Based on the experiment of water displacing oil, the resistivity curve of some reservoirs change in

    “U” shape after waterflooding. The law of changing is different according to the salinity ratio of injected water to original

    formation water and pore structure of the reservoir. Thus there are interpretation ambiguity to identify oiliness of the

    reservoir using resistivity curve, which adding the difficulties of identifying waterflooded formation using conventional logging

    data. The new logging technologies of Nuclear Magnetic Resonance and Dual Frequency Resistivity have the advantage that they are

    hardly affected by lithology and salinity. They are unique in identifying waterflooded formation, which somewhat making up the

    deficiency of conventional logging technology. According to practical application, this paper discusses the methods of evaluating

    high salinity waterflooded formation in Zhongyuan Oilfield using Nuclear Magnetic Resonance and Dual Frequency Resistivity

    logging data. The effect is good. The paper can use for reference for the new logging technology application in evaluating

    waterflooded formation.

    Related Articles | Metrics
    MIGRATION VELOCITY ANALYSIS AND MIGRATION IMAGING RESEARCH
    YE Jing-Yan, YAO YA-Lin, WANG Yan-Qun, LI Qing
    Geophysical and Geochemical Exploration. 2009, 33 (6): 674-677.  
    Abstract   HTML   PDF (1927KB) ( 2173 )

    Migration velocity analysis and migration imaging constitute two important parts in seismic data processing. At

    present, time migration has become mature, and depth migration is getting more and more perfect. The common method for time

    domain migration imaging is pre-stack time migration. By adopting stacking velocity analysis along the layer, exact layer

    stacking velocity can be obtained. Through dip correction, pre-stack time migration and CRP de-migration velocity analysis, the

    velocity is optimized step by step, and then a desired RMS velocity field that is up to the geological rule is acquired. In

    addition, the method for building the accurate migration velocity field is summed up through the study of the depth migration

    method. A new seismic data processing flow in combination of Kirchhoff arithmetic based on ray tracing and wave equation

    arithmetic based on wave field extrapolation is presented. As a result, migration velocity analysis and migration imaging are

    considerably improved.

    Related Articles | Metrics
    A DISCUSSION ON THE "SAMPLING GRADE", A KEY TECHNOLOGY IN 1∶200 000 REGIONAL GEOCHEMICAL EXPLORATION
    LENG Fu-Rong, LI Zhi-Qiang
    Geophysical and Geochemical Exploration. 2009, 33 (6): 678-685.  
    Abstract   HTML   PDF (1008KB) ( 940 )

     Stream sediment survey or soil survey was adopted during the 1∶200 000 regional geochemical exploration in Inner

    Mongolia. The coarse sampling grade has performed well in the geological mineral resource prospecting. However, the prospecting

    is to some extent affected by local landscape. Geochemical elements in stream sediments from southern China are distributed in a

    “U”-shaped pattern, which indicates the difference in weathering types and correspondingly the difference in sedimentary

    materials between northern and southern China. Both the coarse and the fine grade samples can probably reflect the anomalies, and

    therefore the -5~+20 meshes(-4~+0.9 mm)and the -120 meshes (-0.125 mm) samples should be adopted during exploration. For

    improving the working efficiency, even the -5 meshes (or -20 meshes) whole grade grains can be adopted. In this way, more

    exploration information can be acquired. This key sampling technology can also be applied to stream sediment survey or soil

    survey of different scales for various landscapes in China.

    Related Articles | Metrics
    THE MAGNETIC FIELD DATA PROCESSING AND INTERPRETATION METHODS BASED ON WAVELET ANALYSIS
    ZHANG Heng-Lei, LIU Tian-You
    Geophysical and Geochemical Exploration. 2009, 33 (6): 686-690.  
    Abstract   HTML   PDF (1404KB) ( 1809 )

    In order to analyze characteristics of underground sources of the high accuracy magnetic data in an effective way, the

    authors employed wavelet transform to make a multiscale analysis of the magnetic data. Based on the inversion and

    interpretation of the plane and profile data, this paper built a geophysical model for the working area by using the 2.5D

    inversion method. Tests show that the wavelet method can separate the information of different underground sources effectively

    and has reliable calculation accuracy and higher resolution than traditional extension and filtering methods.

    Related Articles | Metrics
    THE COMPARATIVE STUDY AND APPLICATION OF SEVERALTIMEFREQUENCY ANALYSIS METHODS IN THE COAL FIELD
    HU Ming-Shun, PAN Dong-Ming, XU Hong-Li, ZHAO Li-Gui
    Geophysical and Geochemical Exploration. 2009, 33 (6): 691-695.  
    Abstract   HTML   PDF (2110KB) ( 2021 )

    In the light of the characteristic time-frequency properties of different time-frequency analysis methods, it is

    important to select an optimal time-frequency analysis method for high precision seismic exploration in the coal field on the

    basis of comparing and studying these methods. Aimed at probing into STFT, Wavelet Transform, S-Transform, Choi-Williams

    Distribution, Wigner-Ville Distribution and its improved methods, this paper studied advantages and disadvantages of every method

    through numerical simulation in time resolution, frequency resolution and interference. The First Break Picking and Separate

    Frequency Display for Collapse Column interpretation were realized by SPWVD and S-Transform, with a good result obtained.

    Related Articles | Metrics
    RESEARCHES ON STABILIZED AND EFFECTIVE INVERSE Q FILTERING
    WANG Shan, YU Cheng-Ye, WANG Yun-Zhuan, LIU Ying-Chao
    Geophysical and Geochemical Exploration. 2009, 33 (6): 696-699.  
    Abstract   HTML   PDF (1520KB) ( 879 )

    The inverse Q filtering is one of the most effective method for tackling the earth attenuation. Stability and

    efficiency are two problems of general concern in inverse Q filtering. In this paper, a stabilized inverse Q filtering was

    implemented and compared with the conventional gain-limited inverse Q filtering by theoretical model and actual seismic data. The

    results show that the stabilized inverse Q filtering can recover effectively the attenuation of the seismic data and restrict

    intelligently the attempt to amplify the ambient noise. At the same time, the effects of noise level and specified gain limit

    Glim on the stabilized inverse Q filtering are also analyzed in this paper.

    Related Articles | Metrics
    WAVE FIELD SEPARATION NUMERICAL MODELING OF SECOND ORDER ELASTIC WAVE EQUATION BY HIGH-PRECISIONSTAGGEREDGRID FINITE DIFFERENCE SCHEME
    CHEN Ke-Yang, YANG Wei, LIU Hong-Lin, WU Qing-Ling
    Geophysical and Geochemical Exploration. 2009, 33 (6): 700-703.  
    Abstract   HTML   PDF (1060KB) ( 2165 )

    This paper proposes an equivalent second order elastic wave equation to solve the problem of being unable to completely

    separate the coupled P and S wave by full elastic wave equation. Through solving this equivalent wave equation by high-order

    staggeredgrid finite difference scheme together with Flux Correction Technology (FCT) and separating wave fields of the

    isotropic model and layered model, the authors accurately obtained the hybrid wave field and completely separated fields of pure

    P wave and pure S wave fields. An analysis of the numerical results shows that the method is effective and reliable in isotropic

    media, and there exists abundant energy transform information in separated pure P and pure S wave field. The result of the study

    is of significance in understanding the propagating law and the elastic wave theory in the complex wave field.

    Related Articles | Metrics
    JOINT INTERPRETATION OF ELECTROMAGNETIC SOUNDINGAND SURFACE MAGNETIC SURVEY DATA
    SUN Zhong-Ren, WANG Li-Na, ZHAO Xue-Juan
    Geophysical and Geochemical Exploration. 2009, 33 (6): 704-706.  
    Abstract   HTML   PDF (453KB) ( 691 )

     The study of gravity-magnetic-electric joint inversion has been very insufficient. Based on electromagnetic sounding data, the authors designed the geological characteristics of the geological body, changed magnetic parameters of the geological body to fit the magnetic survey data, and carried out joint interpretation of electromagnetic sounding and surface magnetic survey data to figure out the magnetic parameters of the geological body. In this way, the aim of the qualitative interpretation of the lithologic character of the geological body can be attained.

    Related Articles | Metrics
    SOME IMPROVEMENTSIN HIGH DENSITY RESISTIVITY DETECTION TECHNIQUE
    CHEN Yi-Jie
    Geophysical and Geochemical Exploration. 2009, 33 (6): 707-709.  
    Abstract   HTML   PDF (417KB) ( 839 )

    In this study, the current supply module and the measurement module in the traditional high-density electric method system are separated from each other, i.e., the measurement circuit is separated from other things. At the same time, the current supply voltage is raised. These measures are evidently effective in suppressing the residual electric field caused by current supply and the environmental noise electric field. The most obvious advantage of this technique lies in the prominence of high resolution and high precision with the preservation of the high-efficiency in the traditional highensity electric method.

    Related Articles | Metrics
    THE DEVELOPMENT OF THE 3D MODEL FOR AEROGEOPHYSICAL SPATIAL DATA
    WU Ping, XU Hui-Ping, XUE Dian-Jun, FU Zong-Tang
    Geophysical and Geochemical Exploration. 2009, 33 (6): 710-714.  
    Abstract   HTML   PDF (806KB) ( 560 )

     As the resultant charts of geophysical data, profile and contour maps are professional and less intuitive; meanwhile, the development of visualization has provided new technology for the display of geophysical results. The authors have mainly fulfilled these tasks: completing the conversation from the aerogeophysical grid to the raster, achieving 3D display for aerogeophysical data and setting the effect of 3D display; obtaining and mapping the multi-surface profiles based on GDI+; designing the interactive fly and fly along the path, putting forward the algorithm of plane design and height design in path planning in the light of three velocity parameters and safe heights in actual flight, which can avoid such impractical situations as the discontinuity of the animation and the flying into the ground.

    Related Articles | Metrics
    THE COMBINATION OF VC++ WITH FORTRANFOR UPGRADING GEOSTATISTICS ALGORITHMS
    LI Jun, LI Shao-Hua, MAO Ping, CHEN Yu-Kun
    Geophysical and Geochemical Exploration. 2009, 33 (6): 715-717.  
    Abstract   HTML   PDF (644KB) ( 1167 )

    Through integrating some stochastic modeling algorithms with small VC++ program, we can easily compare differences of various algorithms and select an appropriate algorithm for the model. Using the good interface of VC++ and combining the mature geostatistics algorithms with Fortran, the authors compiled an easy and convenient system for users. This paper describes the method for changing the Fortran algorithm to dynamic link library (DLL) and calling the DLL in VC++. The utilization of existent Fortran algorithm in VC++ can save much time in programming and help to use resources reasonably.

    Related Articles | Metrics
    THE METHOD AND IMPLEMENTATION OF DATA PROCESSINGIN RESERVOIR EVALUATION  BASED ON VBA
    WANG Gao-Cheng, GUO Ling, CHEN Xin-Bing, XU Lei, TANG Lei
    Geophysical and Geochemical Exploration. 2009, 33 (6): 718-722.  
    Abstract   HTML   PDF (1789KB) ( 1163 )

     Aimed at the existing fussiness and blunders in data processing of reservoir evaluation, the authors designed a software package in VBA language based on the intrinsic relationship between the parameters. Using deviation data, well data, layering data, sand body data, well logging interpretation data and interbed data, its function includes deviation correction, statistics of sand body thickness and sand-shale ratios, interbed data computation, interbed deduction and net computation, zoning statistics of reserve parameters, coordinate selection, and data format translation between common softwares.

    Related Articles | Metrics
    THE QUALITY MANAGEMENT INFORMATION SYSTEMFOR 3D SEISMIC EXPLORATION IN THE COAL FIELD
    KUANG Wei, LI De-Chun, ZHAO Juan-Juan, CUI Wei-Xiong
    Geophysical and Geochemical Exploration. 2009, 33 (6): 723-725.  
    Abstract   HTML   PDF (4729KB) ( 649 )

    In the light of the present requirement and existent problems of 3D seismic data acquisition in the coal filed, the authors applied the information management skill to the 3D seismic exploration, which could reduce man-made error and improve efficiency. According to the demands of the exploration party and coal mine manager, the quality management information system for 3D seismic survey exploration in the coal field was developed. The main functions of this system include area management, file management, shot geophone distribution, fold calculation, construction area statistics, shot to geophone distance or orientation angle display, seismic data quality analysis and evaluation etc. The application of this system to actual production has yielded satisfactory results.

    Related Articles | Metrics
    THE CONVERSION OF POINT FILE IN MapGIS TO NAVIGATION POINTS OF MapSource IN THE REGIONAL GEOCHEMICAL SAMPLING ARRANGEMENT MAP
    XIE Qing-Feng, LI Sheng-Chang, CAI Chun-Nan, GUI Xin-Xing, HE Zhen, CHEN Shu-Mei, LI Chang-Song
    Geophysical and Geochemical Exploration. 2009, 33 (6): 726-728.  
    Abstract   HTML   PDF (393KB) ( 899 )

    GPS navigation is commonly used to locate each sampling points during regional geochemical sampling work. At present, however, the sampling locations should be recorded in GPS by manual input. This paper mainly deals with the conversion of point file in MapGis to navigation points of MapSource in the regional geochemical sampling arrangement map. This technique can undoubtedly improve the sampling efficiency and precision in field work.

    Related Articles | Metrics
    THE THEORY OF THREEDIMENSIONAL DC FOCUSING RESISTIVITY TECHNIQUEIN TUNNEL ADVANCED EXPLORATION
    RUAN Bai-Rao, QIANG Jian-Ke, ZHOU Jun-Jie
    Geophysical and Geochemical Exploration. 2009, 33 (6): 729-732.  
    Abstract   HTML   PDF (611KB) ( 796 )

    In tunnel advanced exploration, the lateral focusing resistivity method has become a common method in logging. The authors carried out researches on the electrode assemblage of the three-dimensional tunnel DC focusing method. Based on the calculation and analysis of the current distribution regularity of two like point electric sources, this paper points out that, due to the mutual repellency of the current, the current density will produce the maximum value at a certain depth below the perpendicular bisector of the two point electric sources, and this depth is in direct proportion with the distance between the two point sources. On such a basis, the authors designed three kinds of electrode assemblages, i.e. four-point electric sources, five-point electric sources and nine-point electric sources. Then, the three-dimensional finite element digital simulation method was used to calculate the spatial potential distribution of these three electrode systems. The results show that the nine-point electric source type can yield fairly good current beam bunching effect and, moreover, the effect of the current seems to be the best when the current of the principal electrode is lower than the current of the shielded electrode.

    Related Articles | Metrics
    THE APPLICATION OF SEISMIC ANGLES OFFSET TOADVANCED GEOLOGICAL PREDICTION IN TUNNEL CONSTRUCTION
    YE Ying
    Geophysical and Geochemical Exploration. 2009, 33 (6): 733-736.  
    Abstract   HTML   PDF (1079KB) ( 654 )

    This paper describes a seismic angles offset method for advanced geological prediction in tunnel construction. The author uses a combined angles and position offset system to manufacture the USP system and, with the practical example of tunnel engineering, shows the application effect.

    Related Articles | Metrics
    THE APPLICATION OF GEOPHYSICAL ELECTRIC METHODTO THE INSPECTION OF FOUNDATION PILE LENGTH
    LI Hong-Tao, WANG Ying-Chao, LEI Ming, LIU Wen-Zeng
    Geophysical and Geochemical Exploration. 2009, 33 (6): 737-740.  
    Abstract   HTML   PDF (682KB) ( 810 )

    On the basis of the electric field distribution characteristics produced by underground-orientated current supply from singlepoint electrode (or multi-point electrode) and infinite electrode and through detection of potential difference distribution at surface, we can determine the buried depth of underground single-point electrode (or multi-point electrode) and, on such a basis, determine the length of the concrete pipe pile. In combination with the inspection of the real pile length of the prestress pipe pile, the authors made electric logging comparative test and found that the inspection was successful. The achievements made by the authors can remedy the ineffectiveness of the low strain reflection wave method and overcome the difficulty in precise determination of the practical length of the multi-joint prestress pipe pile. It is thus held that geophysical electric method can be used to determine the length of the engineering pile and prevent the hidden trouble in engineering quality caused by saving illegally on material and labor.

    Related Articles | Metrics
京ICP备05055290号-3
Copyright © 2021 Geophysical and Geochemical Exploration, All Rights Reserved.
Tel:(8610)62301569   Email:wt@caict.ac.cn