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  • Table of Content
      24 December 1989, Volume 13 Issue 6 Previous Issue    Next Issue
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    THE APPLICATION OF HIGH-PRECISION LARGE SCALE(1:50, 000) AEROGEOPHYSICAL PROSPECTING TO THEEXPLORATION OF OIL-GAS RESERVOIRS
    Cai Zhenjing
    Geophysical and Geochemical Exploration. 1989, 13 (6): 401-411.  
    Abstract   HTML   PDF (825KB) ( 609 )

    This paper describes the geological effects of high-precision aeromagnetic survey and high-sensitivity aeroradiometry performed from 1985 to 1988 by Aerogeophysical Remote Sensing Center in eleven areas including Binxian-Boxing.sea area of Liaodong Gulf, Uagang, northern part of central Hebei, mouth of the Yellow River and Nanyang basin. It summarizes the role played by high-precision aerogeophysical prospecting method in prospecting for oil-gas fields, and makes a preliminary discussion on direct search for oil.

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    THE MIGRATION PORM OF GOLD IN THE LINGLONGGOLD OREFIELD AND ITS GEOCHEMICAL SIGNIFICANCE
    Qiu Yunin
    Geophysical and Geochemical Exploration. 1989, 13 (6): 412-420.  
    Abstract   HTML   PDF (646KB) ( 657 )

    Using geochemical methods, this paper studies the migration form of gold in various gold deposits of the Linglong gold orefield and its geochemical significance. The results show that gold migrated in the form of various complexes such as AuCl4-, AuCl2-, Au(HS)2- and Au2S(HS)22-, with AuCl2- dominant in the early hypothermal stage and Au(HS)2- dominant in the late mesothermal-epithermal stage. This understanding is of great significance in the study and application of new geochemical gold prospecting techniqes such as thermal chlorine-releasing and geoelectrical chemical survey.

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    A STUDY OF PRIMARY HALOS AROUND A GOLDDEPOSIT OP BRECCIA PIPE
    Qiu Detong, Fan Hongrui, Yu Yangcheng, Chu Shide
    Geophysical and Geochemical Exploration. 1989, 13 (6): 421-428.  
    Abstract   HTML   PDF (545KB) ( 415 )

    This paper deals with the composition and zonality of the primary halos around the Qibaoshan gold deposit, pointing out that the enrichment of tung sten element has indicator significance for gold mineralization. The elements in primary halos of the ore deposit show distinct zoned distribution, and the vertical zoning is especially clear and consistent fully with the general verti cal zoning model for primary halos around volcanic type gold mineralizations and deposits. This paper provides not only valuable data for ore prospecting, but also significant information for geological evaluation, exploitation and uti lization of the ore deposit. The element associations of primaiy halos play a guiding role in exploration of the ore deposit, and the delineation of the ano malies contributes to the correct determination of the shape and attitude of the orebodies. The study of spatial distribution of major mecallogenic elements in primary halos can provide theoretical basis for exploitation of the ore deposit.

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    THE APPLICATION OF HISTOGRAM TECHNIQUE TOLOGGING INTERPRETATION
    Li Daxin
    Geophysical and Geochemical Exploration. 1989, 13 (6): 429-434.  
    Abstract   HTML   PDF (409KB) ( 325 )

    The histogram technique is a simple and audio-visual analytical method which is especially suitable for interpretation workers in checking on the qua lity of original logging curves and choosing strata parameters that the inter pretation model requires. Under some favorable conditions, this technique can also be used to correlate strata and distinguish sedimentary environments.

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    A STUDY OF IMAGE RECONSTRUCTION AND IMAGEPROCESSING TECHNIQUES FOR PHOTOS OFDEEP-SEA POLYMETALLIC NODULES
    Zhang Yujun, Shi Jianwen
    Geophysical and Geochemical Exploration. 1989, 13 (6): 435-441.  
    Abstract   HTML   PDF (1170KB) ( 407 )

    This paper reports the results of research on image reconstruction and image processing techniques for photos of poly metallic nodules from the bottom of deep sea. The major troubles with submarine photos include uneven distribution of illuminance, unsatisfactory focusing, frequent existence of iron wire image, local mud interference etc. The present paper analyses the mathematio model for distiibution of illuminance and derives the formulae for illuminance distiibution and light sensitivity distribution under the conditions of inclining camera system and horizontal camera system. Using image proces sing system, we have successfully developed a suite of image reconstruction and image processing techniques suitable for submarine photos and drawn a detailed flow chart. As examples, four pictures are attached to this paper, which illustrate the obvious effects of our method in such aspects as elimina ting uneven illuminance and iron wire interference, laising contrast and resolution power, automatic classification and scientific statistical analysis of coverage, and indicate the possibility of examining textures and shapes of the nodules by means of partial enlargement. The method described in this paper serves as an important tool for improving and studying precious submarine photos.

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    THEORETICAL STUDY OF RECEIVING ELECTRODEMAGNETIC-ELECTRIC METHOD
    Xu Zudong, Fu Liangkui, Jiang Guofu
    Geophysical and Geochemical Exploration. 1989, 13 (6): 442-452.  
    Abstract   HTML   PDF (682KB) ( 421 )

    This paper first gives the expression for anomalous magnetic field produ ced by spherical orebody buried in bedrock along the surface peincipal profile under the condition of horizontal cover with the adoption of receiving electrode pure anomaly feed system, then gives calculations for anomalous magnetic fields with different electric conductivities under covers of any thickness, and also makes a systematic analysis of the distribution of anomalies. Finally, it is concluded that in prospecting for blind orebodies at depth under the condition of low-resistance cover, the adoption of receiving electrode magnetic-electric-method can theoretically hold water, whereas the surface feed system will surely be useless.

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    THE CONVERSION OF MEASURED APPARENT COMPLEXRESISTIVITY AMPLITUDE SPECTRA INTO PHASESPECTRA:ITS FEASIBILITY
    Wang Zili, Zhang Saizhen
    Geophysical and Geochemical Exploration. 1989, 13 (6): 453-457.  
    Abstract   HTML   PDF (296KB) ( 445 )

    After giving a theoretical explanation of the feasibility of the conversion of apparent complex resistivity amplitude spectra into apparent phase spectra, this paper, in combination with the practical situation, deals with the error propagation in the process of this conversion. It is concluded that such a conversion, though theoretically feasible, is generally infeasible in practice. The implication of this conclusion lies in the fact that in general the apparent phase spectrum data can only be collected in practice .although this will lower the efficiency of field work.

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    THE ORE-PROSPECTING SIGNIFICANCE OF SECOND-ORDER ANOMALIES IN AN AEROMAGNETICNEGATIVE FLELD
    Liu Hongsong
    Geophysical and Geochemical Exploration. 1989, 13 (6): 458-464.  
    Abstract   HTML   PDF (473KB) ( 352 )

    Based on data of 1:50, 000 aeromagnetic survey performed in 1970s, this paper makes an integrated study and detailed interpretation of some low and gentle second-order anomalies in the background of the negative field, fur thermore, it infers and deals with the properties and values of these low and gentle anomalies, and advances some new ore-prospecting clues.Through the description of some examples, the author tries to tell resear chers that due attention should be paid to aeromagnetic low and gentle se cond-order anomalies.

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    THE PRINCIPLE AND APPLICATION OF RAYLEIGH WAVE EXPLORATION METHOD
    Yang Chenglin
    Geophysical and Geochemical Exploration. 1989, 13 (6): 465-468.  
    Abstract   HTML   PDF (334KB) ( 767 )
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    THE EFFECTS OF APPLYING ELECTROMAGNETIC FIELD TO HYDROLOGIC ENGINEERING WORK
    Cui Guanghao, Zhang Hongyuan
    Geophysical and Geochemical Exploration. 1989, 13 (6): 468-470.  
    Abstract   HTML   PDF (240KB) ( 357 )
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    THE EFFECTS OF APPLYING MAGNETIC-ELECTRIC EXPLORATION LINE INTEGRAL METHOD TO OIL-GAS PROSPECTING
    Ma Ying
    Geophysical and Geochemical Exploration. 1989, 13 (6): 470-472.  
    Abstract   HTML   PDF (291KB) ( 500 )
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    A PRELIMINARY DISCUSSION ON THE GENESIS OF THE XIAOTANGSHAN GEOTHERMAL FIELD IN BEIJING
    Xin Yongshui
    Geophysical and Geochemical Exploration. 1989, 13 (6): 473-475.  
    Abstract   HTML   PDF (262KB) ( 449 )
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