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《Marine Geology & Quaternary Geology》 2002-01
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BASIC CHARACTERISTICS OF OIL AND GAS GEOCHEMICAL EXPLORATION IN THE SEA AREAS IN CHINA

CHENG Jun 1,LIU Chong-xi 2, ZHAO Ke-bin 2, LI Wu 2 ( 1Graduate Institute of China University of Geosciences,Beijing 100083,China; 2Hefei Petroleum Geochemical Prospecting Institute,Sinopec,Hefei 230022,China)  
The study on seeking oil and gas reservoirs in sea areas in China by geochemical prospecting methods has been conducted for almost 30 a,and some primary results have been achieved.Based on the practical and scientific data obtained from the long period of study,the authors summarized the distribution characteristics and the content variation regularities of acid-extraction,head-space hydrocarbons,fluorescence spectrum,ultraviolet absorption spectrum,altered carbonate,heat-released mercury,helium and trace mental elements in the sea bottom sediments,as well as hydrocarbons,benzene and phenol dissolved in waters.The following knowledge has been obtained through the summarization of the relationship between these indicators and the underground reservoirs:①The geochemical distribution varies greatly in different sea areas.②The geochemical effect over oil and gas reservoirs is stronger in the shallow than in the deep.③Vertically,the geochemical indicators change with a positive gradient from the deep to the shallow,indicating significant oil and gas migration trace.④The geochemical anomalies tend to occur within the depression and their adjacent areas,and seldom occur in the uplift areas.⑤The analysis of the indicator combination characteristics shows that the light oil and nature are the exploration focus in various marine areas.The series of techniques selected for marine oil and gas geochemical exploration are for comprehensive hydrocarbon gases(including absorption hydrocarbon,occluded hydrocarbon,water-dissolved hydrocarbon)and aromatic hydrocarbons.While these indicators are sensitive to reservoirs after restraining the disturbance factors and quantitative correction,continuous detecting technique of the chemical composition of the water near sea bottom is the important method for oil and gas geochemical exploration that will develop later.Exploration practices have documented that geochemical prospecting is the direct and effective method for seeking oil and gas reservoirs in sea areas.
【CateGory Index】: P618.13
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