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  • Table of Content
      24 June 1995, Volume 19 Issue 3 Previous Issue    Next Issue
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    DYNAMIC COLLECTION OF GEOGAS AND ITS PRELIMINARY APPLICATION IN SEARCH FOR CONCEALED DEPOSITS
    Wang Xueqiu, Xie Xuejing, Lu Yinxiu
    Geophysical and Geochemical Exploration. 1995, 19 (3): 161-171.  
    Abstract   HTML   PDF (587KB) ( 850 )

    Geoges method, a method designed to search for concealed deposits, was developedin mid-1980s. The method may be a powerful means in the prospecting for deeply concealeddeposits. Nevertheless, it has merely a limited application because of its high cost and lowefficiency. Hence, the anchors developed a new rapid method for dynamic collection of geogaswhich has proved to be satisfactory over a buried gold deposit. The possible migration mechanism of geogas is also discussed in this paper. This new technique will enable prospectors to meet the challenge in search for concealed deposits in near future.

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    THE INTEGRATED EXPLORATION OF OIL AND GAS FIELDS WITH HYDROGEN SULFIDE,PHASE STATE HYDROCARBON AND SELF-POTENTIAL METHODS
    Li Shengyu, Xu Fengfu
    Geophysical and Geochemical Exploration. 1995, 19 (3): 172-177.  
    Abstract   HTML   PDF (442KB) ( 499 )

    Based on tests conducted in recent years. the anchors advance a new method forexploration of oil and gas fields with soil-adsorbed hydrogen sulfide as an index. Combiningthis method with phase state hydrocarbon method and self-potential method, the authorsobtained satisfactory results over some known oil and gas fields. In oil and gas accumulations, there are large quantities of hydrogen sulfide gases and sultur-bearing organic compounds. When oil and gas approach the surface through vertical micropercolation, sulfide gasesalso reach such place. In the process of migration, a series of complicated chemical changesof hydrogen sulfide gasas and sulfur-bearing compounds would tabe place under the action ofbacteria and oxygen, forming for example sulfate. Nevertheless, tests have proved that innear-surface soils over oil and gas accumulations there remain obvious anomalies of hydrogensulfide gases, which assume anular, semi-anaular, sheet and zonal shapes. The anomlies agreewith the underlying oil and gas accumulations or fault structures, suggesting that hydrogensulfide survey may be used in the exploration of oil and gas fields.Moreover, these anomaliesare in good accord with phase state hydrogen anomalies and self-potential anomalies, with allof these anomalies appearing over the oil and gas accumulations. All this shows that theintegrated utilization of these three methods would yield more satisfactory rosults.

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    THE APPLICATION OF GENETIC ALGORITHM TO RAYLEIGH WAVE INVERSION
    Zhao Dong, Wang Guangji, Wang Xingtai, Sun Renguo
    Geophysical and Geochemical Exploration. 1995, 19 (3): 178-185.  
    Abstract   HTML   PDF (750KB) ( 1216 )

    The Rayleigh wave inversion is of the nonlinear optimization problem. The available local linearization techniques (such as the method of the damping least squares) oftencause the solution estimation to fall into the local minimum value of the objective function,and depend largely on the initial model. In addition, some simple Rayleigh wave inversionmethods widely used at present also have apparent defects.The overall optimization method-genetic algorithm-greatly lowers the requirements forselection of the initial modols and is unlikely to fall into the local optimal solution. Thepresent paper first used an available simple and convenient inverse interpretation method toobtain the initial model, thus deciding the searching range of model parameters, and thenmado inversion by using genetic algorithm to obtain the final medium model. The result isvery satisfactory.

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    THE STUDY AND EVALUATION OF THE CONFINING BEHAVIOR OF THE CAPPING BED BY USING WELL LOGGING DATA
    Chen Yaocen
    Geophysical and Geochemical Exploration. 1995, 19 (3): 186-194.  
    Abstract   HTML   PDF (611KB) ( 593 )

    in this parer, the author first dealt with the capping bed, the major indices controlling the confining and blocking quality of the caping bed. the grading evaluation of thecapping bed, and the factors affecting the confining capacity of the capping bed. After that,regression analysis was used to find out the correlation between the geophysical characteristics of the capping bed and such factors as breakthrough pressure, permeability, mud contentand porosity under different conditions. Finally, grading evaluation of the capping bed wasperformed on the basis of well logging data.Exemplified by the work in a certain oil field, the present paper points out the feasibilityof applying wall logging data to the study and evaluation of the confining behavior of thecapping bed as well as the fairly good geological effect that can be obtained.

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    THE EFFECT OF APPLYING R-MODE FACTOR ANALYSIS TO RADIOACTIVE OIL-GAS EXPLORATION
    Wang Xiangyun, Shi Yuchun, Wu Yaocheng
    Geophysical and Geochemical Exploration. 1995, 19 (3): 195-199.  
    Abstract   HTML   PDF (376KB) ( 405 )

    Oil and gas exploration and survey with seven radioactive methods were conductedin an area of 150 km2 in central Sichuan and, as a result, 1902 data were obtained. UsingR-mode factor analysis, the authors studied five methods, seven indices and 1176 data. Theresults of the study show that factor analysis can provide combinational information fordelineating oil and gas anomalies, reduce interference, make prominent anomalies, and pointout prospect area for further oil and gas exploration in the study district.

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    THE LEAST MEAN-SQUARE ERROR FILTERING REDUCTION TO THE POLE OF MAGNETIC ANOMALIES
    Zhang Xiaolu
    Geophysical and Geochemical Exploration. 1995, 19 (3): 200-211,217.  
    Abstract   HTML   PDF (933KB) ( 833 )

    As a regularization technique for reduction to the pole of wavenmber dcmainmagnetic anomalies, the method can enhance the stableness of the operator of the raductionto the pole, and suppress the interference of high wavenumber. As for the reduction to thepole of aeromagnetic anomalies in low latitude area and middle-low latitude area with graveinterference,the method can suppress banded magnetic interference in north-south directionand produce stable results. In the case of redoction to the pole for △T anomnalies of highprecision ground magnetic survey with effective high noise level, it can considerably suppressthe noise level and gain high-quality reduction to the pole results,regardless of the latitude.

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    A PRELIMINARY DISCUSSION ON THE NECESSITYAND FEASIBILITY OF CARRYING OUT PHYSICAL PROPERTY SURVEY OF REGIONAL ROCKS
    Lü Jingjian
    Geophysical and Geochemical Exploration. 1995, 19 (3): 212-217.  
    Abstract   HTML   PDF (709KB) ( 779 )

    Following a summarization of the state of regional rock physical property surveyin China,the present paper has given such survey a clear definition and sets forth its necessity and feasibility. The regional rock physical property survey should be carried out inaccordance with a plan, the integrity (i. e., no lfthologic series being absent) and represeotativeness (i. e. key rocks in various series being made prominent) of sampling must be emphasized, and the method for integrated physical property determination and investigationought to be adopted so as to carry out correlative studies of various aspects. Unlike the routine physical property work, such survey has a more profound and extensive practical significance. It can provide basic data for regional geological survey, design and interpretationof regional geophysical and geochemical prospecting, and solution of some specific geologicalproblems. It is thus absolutely necessary to conduct ragional rock physical property surveyat the present stage.

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    THE EFFECT OF APPLYING IP TIME SPECTRUM APPARENT PARAMETERS TO THE APPRAISAL OF IP ANOMALIES
    Zhuang Mingshang, Shang Shigui
    Geophysical and Geochemical Exploration. 1995, 19 (3): 218-223.  
    Abstract   HTML   PDF (412KB) ( 542 )

    In four known areas, time spectrum IP method was used to evaluate apparentparameters of Cole-Cole model by means of inversion and, through an integrated considerationof the function of ηsηs and Cs parameters, the IP Properties Of the buried polarized bodieswere studied comprehensively. According to the application achievements, it is shown thatunder the condition of three-dimensional terrestrial electricity and polarized wall rock, IPanomalies can be appraised, i. e., anomalies with ore-prospecting significance can be pointedout.

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    THE EFFECT OF APPLYING HIGH POWER IP TO THE EXPLORATION OF OIL AND GAS FIELDS
    Xing Yingdi
    Geophysical and Geochemical Exploration. 1995, 19 (3): 224-228.  
    Abstract   HTML   PDF (387KB) ( 410 )

    This paper deals briefly with the basic principles of applying time domain IP tothe exploration and evaluation of oil and gas fields. Based on the adoption of Canadian TSQ-4 high power IP system and exemplified by its application to several oil fields in North China and Northwest China,it is concluded that this method is inexpensive,effective, flexible,and suitable for complex topography, and hence its effecct is very obvious.

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    A PRELIMINARY DISCUSSION ON THE EFFECT OF APPLYING HIGH-DENSITY RESISTIVITY METHOD TO ENGINEERING SURVEY
    Wang Wenlong, Chen Tiankui
    Geophysical and Geochemical Exploration. 1995, 19 (3): 229-237.  
    Abstract   HTML   PDF (556KB) ( 1125 )

    In engineering geological survey, people used to adopt electrical sounding methodas electrical exploration. Nevertheless, the electrical sounding method has the defects ofsparse measuring points, insufficient information and, for some detection objects, difficultyin data interpreation. For the purpse of overcoming these troubles, the authors introduced anew method for electrical oxploration-high density resistivity method. Several years application of this method to different detection objects has shown that the high-densityresistivity method is a simple, convenient and effective technique in engineering geological survey.

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    THE APPLICATION OF ELASTIC WAVE FREQUENCY TEST IN SHALLOW SEISMIC EXPLORATION
    Du Pingan
    Geophysical and Geochemical Exploration. 1995, 19 (3): 238-240.  
    Abstract   HTML   PDF (338KB) ( 346 )
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