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Formation mechanism and geochemical characteristics of shallow natural gas in heavy oil province,china

Science china Earth Sciences 2008年第S1期51卷 96-106页

作者： zhu guangyou,zhang shuichang,zhao wenzhi,wang zhengjun,liang yingbo, zhao xuefeng&zhang jingyan petrochina oil geologic lab center,research institutes of petrochina exploration and development,beijing 100083,china petrochina oil Geol lab Ctr Res Inst PetroChina Explorat & Dev Beijing 100083 Peoples R China

Shallow gas reservoirs are distributed widely in Chinese heavy oil-bearing *** present,shallow gas resources have opened up giant *** previous researches indicate the intimate genetic relationship between shallow gas and heavy *** gas resources are generated from crude oil degraded by anaerobic microscopic organism,it belongs to biogenic gas family of secondary genesis, namely heavy oil degraded *** gas resources are usually distributed in the upward position or the vicinity of heavy oil *** are mainly of dry gas,which are composed of methane and only tiny C2 + heavy hydrocarbon and relatively higher contents of nitrogen ***,methane isotopes are light,whose values are between biogenic gas and thermal cracking *** isotopes are heavy,which mixed possibly with thermogenic *** dioxide bear the characteristics of very heavy carbon isotope,so carbon isotopic fractionation effects are very obvious on the process of microscopic organism degradation crude *** heavy oil degraded gas formation,a very complex geological,geochemical and microbiological geochemical process,is the result of a series of reactions of organic matter-microbes and water-hydrocarbon,which is controlled by many factors.

关键词： heavy oil degraded gas shallow gas heavy oil biogenic gas anaerobic degradation

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