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Primary migration and secondary alteration of the Upper Paleozoic gas reservoir in Ordos Basin,China―Application of fluid inclusion gases

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Science China Earth Sciences 2008年第S1期51卷 165-173页

作者： GONG Se 1,2 ,PENG PingAn 1 ,SHUAI YanHua 3 ,DAI JinXing 3 &ZHANG WenZheng 4 1 Guangzhou Institute of Geochemistry,the Chinese Academy of Sciences,Guangzhou 510640,China 2 common wealth scientific and research organization,petroleum resources,po box 136,north ryde,new south wales,1670,australia 3 research Institute of petroleum Exploration and Development,PetroChina,Beijing 100083,China 4 research Institute of Exploration and Development,Changqing petroleum Corporation,Xi’an 710021,China Guangzhou Institute of Geochemistry the Chinese Academy of Sciences Guangzhou China common wealth scientific and research organization Petroleum Resources North Ryde Australia research Institute of petroleum Exploration and Development PetroChina Beijing China research Institute of Exploration and Development Changqing Petroleum Corporation Xi’an China

The composition of fluid inclusions(FI)often represents the initial geochemical characteristics of palaeo-fluid in reservoir *** on composition and carbon isotopic composition of gas during primary migration,reservoir-forming and subsequent secondary alterations are discussed through comparing fluid inclusion gas with coal-formed gas and natural gas in present gas reservoirs in the Ordos *** results show that primary migration of gas has significant effect on the molecular but not on the carbon isotopic composition of *** and diffusion fractionation took place during the secondary migration of gas in Upper Paleozoic gas reservoir according to carbon isotopic composition of methane in *** and carbon isotopic composition of natural gas were nearly unchanged after the gas reservoir forming through comparing the FI gases with the natural gas in present gas reservoir.

关键词： secondary alteration fluid inclusion carbon isotope Ordos Basin

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