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Fluid inclusion evidence for petroleum accumulation in northern Qaidam Basin.pdf

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Fluid inclusion evidence for petroleum accumulation in northern Qaidam Basin

Chin．J．Geochem．(2Ol 0)29：422-430 D0I：10．1007／sl 163l一0l0—0475一l Fluid inclusion evidence for petroleum accumula- tion in northern Qaidam Basin YANG Yu ．，nfeng 213，LI Xi。anqing ，，FENG． Songbao ’。，wANG Kangdong ，KONG Longxi ’。，DONG Peng ， XU Feng ．PENG Dehua ．and CHEN Yan StateKeyLaboratoryofCoalResourcesandSafeMining,ChinaUniversity ofMiningandTechnology,Beijing100083，China Colege ofGeoscienceandSurveyingEngineering,ChinaUniversityofMiningandTechnology,Beijing100083，China State Key Laboratory D，Petroleum Resource andProspecting,China University ofPetroleum，Beijing 102249，China Research Institute ofExploration and Development．Qinghai Oilfeld Company,PetroChina,Dunhuang 736202，China Coresponding author,E-mail：上 @cumtb edu en Received August 25，2009；accepted November 3，2009 ◎ Science Press and Institute of Geochemistry,CAS and Springer-Verlag Berlin Heidelberg 20 1 0 Abstract Based on the results of fluid inclusion study(microscopic characteristics，homogenization temperatures and grains wich oil inclusions)，the pool—forming time of the Nanbaxian and Mabei 1 oilfields in no~hern Oaidam Basin was discussed in this paper．Fluid inclusions in no~hern Oaidam Basin are relatively abundant，including aqueous inclusions and hydrocarbon inclusions．These inclusions are smal(5—1 0 m)，and mainly distributed in quartz fissures．overgrowths and cementations．The abundances of grains with oil inclusions(GOB are commonly low．The GOI values of most samples are between 2．0％ 1 0．5％．and those of about 40 percent of total samples ex— ceed 5％，The homogenization temperatures of fluid inclusions in diferent samples are markedly dissimilar,indicat— ing mat these inclusions were formed in different periods．According to the measured homogenization temperatures of fluid inclusions and in combination with bufial history and ther／nal evolution history,the Nanbaxian and Mabei 1 oilfields are deduced，which have experienced two hydrocarbon charging periods，with the form er ofN1一N2 and N2 一 N7 ，and th