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  • Table of Content
      24 December 1998, Volume 22 Issue 6 Previous Issue    Next Issue
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    THE STUDY OF VSP APPLICATION IN ENGINEERING EXPLORATION
    Xu Mingcai, Gao Jinghua, Chai Mingtao
    Geophysical and Geochemical Exploration. 1998, 22 (6): 401-407,414.  
    Abstract   HTML   PDF (373KB) ( 799 )

    Vertical seismic profile (VSP) is an effective method for engineering geological investigation. The paper begins with the forward modeling problem based on character of the investigation and then discusses the technique and application effects of engineering VSPas examplified by the VSPinvestigation of the second tunnel through the Huangpu River in Shanghai. The utilization of downhole multi channel instrument and electrical spark source helps to carry out the VSPinvestigation. Double f-k filtering can effectively separate up and down going wave fields in date processing.

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    SOME BASIC PROBLEMS IN THE APPLICATION OF GROUND-PENETRATION RADAR
    Lei Linyuan
    Geophysical and Geochemical Exploration. 1998, 22 (6): 408-414.  
    Abstract   HTML   PDF (1144KB) ( 1628 )

    Four basic problems in the application of Ground penetrtion-radar are discussed in this paper:(1) the wave-impedance of electromagnetic wave transmission in strata; (2) the reflectivity and transmissivity of electromagnetic field at the subsurface of strata; (3) reflective phase and propagating velocity of electromagnetic wave in strta; (4) detection depth of the Ground-penetration radar.

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    THE EFFECTS OF APPLYING THE ELECTRIC ADSORPTION METHOD TO THE PROSPECTING FOR CONCEALED OREBODIES IN THE HOUGOU GOLD DEPOSIT, HEBEI PROVINCE
    Zhou Qiming, Zhang Maozhong, Li Shuiming, Lai Jinqiu, Huang Hualuan
    Geophysical and Geochemical Exploration. 1998, 22 (6): 415-419.  
    Abstract   HTML   PDF (220KB) ( 522 )

    Based on the theory of CHIMelectrogeochemistry,the electric adsorption method means the discovery of concealed orebodies by their element anomalies,which are shown through stimulating the samples in a special electric installation and adsorbent in laboratory.Satisfactory test results were obtained over the orebody in the Hougou gold deposit which is covered by several meters of soil.

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    INSPECTION OF COMPOSITE ANOMALIES AND OPTIMIZATION OF GOLD-PROSPECTING TARGETS IN WUSHAN AREA,NORTHERN SUIZHOU—ZAOYANG,HUBEI PROVINCE
    Chen Shouyu, Zhang Jun, Cao Xinzhi
    Geophysical and Geochemical Exploration. 1998, 22 (6): 420-424,419.  
    Abstract   HTML   PDF (545KB) ( 739 )

    The Wushan area of Hubei Province is characterized by detailed exploration and insufficient research work.In the light of such a condition,the authors tapped the valuable ore-prospecting informatiuon from the original data,detected composite geological,geophysical and geochemical anomalies through the calculation of information quantity and,using the technique combining points,lines and planes,made anomaly inspection and gold target optimization.As a result,the favorable sector in search for Qingshansi faulted altered rock type gold deposit was discovered.

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    GEOCHEMICAL CHARACTERISTICS OF THE NAKYN KIMBERLITE ORE DISTRICT IN YAKUT AREA
    Wang Fengyu, S. V. Grigorian
    Geophysical and Geochemical Exploration. 1998, 22 (6): 425-430.  
    Abstract   HTML   PDF (383KB) ( 571 )

    The present paper has described geochemical characteristics of the Nakyn kimberlite ore district in Yakut area,Russia. Through geochemical sampling on different scales from stream sediments, soils and drilling cores of this area in combination with spectral absorption and X-ray radiometric survey,this paper has revealed secondary anomalies of indicator elements or kimberlite in this area in the light of rounded structure of the ore district as well as the distribution characteristics of such indicator elemlents of kimberlite as Cr,Co,Sr,Zr and Yin stream sediments,soils and drilling cores.In this way,the feasibility of applying geochemical tecnique to the prospecting for deep concealed kimberlite pipes has been proved.

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    THE ELIMINATION OF FALSE ANOMALIES RESULTING FROM CORRELATION BETWEEN BOUGUER ANOMALIES AND TOPOGRAPHY IN QIANGTANG,TIBET
    Chen Chao
    Geophysical and Geochemical Exploration. 1998, 22 (6): 431-435,439.  
    Abstract   HTML   PDF (461KB) ( 836 )

    In highland areas,Bouguer anomalies observed on the undulating ground often take the shape related to the topographic relief.This leads to misunderstanding and renders the interpretation of the gravity anomalies difficult.In this paper,the author describes the causes of this trouble in Qiangtang,Tibet,and presents an effective approach to remove the false anomalies,which involves doing bouguer correction with relative height instead of absolute elevation and adjusting the density of the correction by making correlation analysis for the anomalies and elevations.

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    A CASE STUDY OF SOIL MAGNETISM USED IN OIL AND GAS EXPLORATION
    Sun Aiqiu
    Geophysical and Geochemical Exploration. 1998, 22 (6): 436-439.  
    Abstract   HTML   PDF (607KB) ( 458 )

    A case study of soil magnetism used to survey hydrocarbon is described in this paper.Two sections over the oil field in Langfang—Guan depression was studied and 164 soil magnetism samples were collected from 59 sites.Magentic susceptibility (MS) and nature residual magnetism (NRM) were tested,but the anomalies of MS,NRM could not be easily associated with oil wells.Alternating demagnetization for part of samples was done and,as a result,a specific demagnetization curve over the oil well was found,which is different from the curve over dry well.Amineralization model is advanced,in which magnetite is developed over hydrocarbon seepage,and hematite is distributed over the formation that contains no hydrocarbon.

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    CHARACTERISTICS OF GRAVITY FIELD AND STRUCTURE OF THE EARTH'S CRUST IN THE QINGHAI—TIBET PLATEAU
    Yin Xiuhua, Li Yishi, Feng Hua
    Geophysical and Geochemical Exploration. 1998, 22 (6): 440-445.  
    Abstract   HTML   PDF (552KB) ( 874 )

    In this paper,the authors probe into the characteristics of regional gravity field,residual gravity field,structure of the earth's crust and regional tectonics on the basis of the Bouguer anomaly map in combination with other geological and geophysical data.

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    THE FREQUENCY FIELD SEPARATION TECHNIQUE OF GRAVITY ANOMALIES AND ITS APPLICATION
    Liu Jun
    Geophysical and Geochemical Exploration. 1998, 22 (6): 446-451,445.  
    Abstract   HTML   PDF (610KB) ( 710 )

    Using Nettleton's method,the author made filtering separation for amplitude spectra of regional anomalies and local anomalies.In view of the low discrimination velocity of the traditional polygonous filter,the author worked out a calculation scheme for rapid discrimination and made theoretical model verification.The technique was eventually used to process measured gravity data.

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    THE APPLICATION OF HIGH-DENSITY RESISTIVITY TECHNIQUE TO ARCHAEOMETRY
    Yan Yongli, Di Qingyun, Gao Libing, Chen Gang
    Geophysical and Geochemical Exploration. 1998, 22 (6): 452-457.  
    Abstract   HTML   PDF (277KB) ( 1136 )

    In probing the underground ruins of ancient city wall of Song Kingdom in East Zhou Dynasty located in Shangqiu Prefecture,Henan Province,the authors employed the high-density resistivity technique.The inversion result of the resistivity is quite coincident with the burial condition of the underground ancient city wall.This shows that archaeometry is an important field in geophysical techniques.

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    A BRIEF DESCRIPTION OF THE STRATAGEM TMEH-4 ELECTRICAL CONDUCTIVITY IMAGE-FORMING SYSTEM AND ITS APPLICATION
    Guo Jianqiang, Wu Yi, Shao Rujun, Cao Fuxiang
    Geophysical and Geochemical Exploration. 1998, 22 (6): 458-464.  
    Abstract   HTML   PDF (656KB) ( 1100 )

    The Stratagem TMEH-4 electrical conductivity image-forming system is a magnetotelluric sounding system which combines partly controllable source and natural field source and consists of receiving device and emitter. Based on the exploration object, one can use high-frequency allocation (10 Hz~100 kHz) or low frequency allocation (0.1 Hz~1000 Hz). By collecting two sets of electromagnetic signals (Ex, Hy, Ey, Hx) in time domain which are perpendicular to each other and through spectral analysis and calculation, the variation curves of different frequencies, resistivities, phases and correlation degrees can be drawn. By analysing and comparing these curves, the on-the-spot judgement of data quality can be carried out, the EMAP two-dimensional continuous profiling inversion can be conducted for continuous inversion result of one-dimensional apparent resistivity of measuring points along the profile, and the gray level diagram of the resistivity section can be illustrated. As a result, preliminary interpretation of the exploration result may be made immediately.Three fields work examples are given in this paper.

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    TRANSMISSION OF IP SQUARE WAVE WITH CONTINUOUSLY VARYING PULSE WIDTH AND MEASUREMENT OF 2ND-DEGREE SIGNAL WITH AUTOMATIC PERIODIC VARIATION
    Deng Ming, Liu Shusen
    Geophysical and Geochemical Exploration. 1998, 22 (6): 465-469.  
    Abstract   HTML   PDF (203KB) ( 516 )

    A new IP data acquistion technique is recommended in this paper,which is chafacterized by the simultaneous acquisition of the information about the attenuation of the polarized 2nd-degree field with time and the variation of this field with depth through one measurement operation. In addition, the paper deals with the instrumental working principle for carrying out this acquisition method and some technological problems which are likely to occur in the process of measurement.

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    AN APPLIED STUDY OF THE FINGERPRINTING HYDROCARBON TECHNOLOGY
    Li Wu, Zhang Jianguo
    Geophysical and Geochemical Exploration. 1998, 22 (6): 470-474.  
    Abstract   HTML   PDF (200KB) ( 517 )

    According to the hydrocarbon analyses of crude oil samples an offshore oil field in China and the sea bed sediments just over this field, it is proved that the advanced technology can be used in such aspects of offshore geochemical prospecting as the correlations between oil and oil and between oil and sea bed sediments, the identification of hydrocarbon characteristics, and the estimation of traps.

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    THE APPLICATION OF OVERLAY SWITCH TO UNDERWATER SEISMIC REFRACTION EXPLORATION
    Wang Guangquan
    Geophysical and Geochemical Exploration. 1998, 22 (6): 475-477.  
    Abstract   HTML   PDF (306KB) ( 526 )

    This paper describes the application of shallow seismic refraction wave method to the exploration of foundation for railway bridges. The overlay switch and the interchange technique are employed, which can speed up field data collection and reduce the costs.

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