Thermochemical sulfate reduction in fossil Ordovician deposits of the Majiang area:Evidence from a molecular-marker investigation  

作　　者：WANG GuangLi LI NingXi GAO Bo LI XianQing SHI ShengBao WANG TieGuan 

机构地区：[1]State Key Laboratory of Petroleum Resources and Prospecting,and Department of Organic Geochemistry and Environmental Science,College of Geosciences,China University of Petroleum [2]Petroleum Exploration and Production Research Institute,SINOPEC [3]State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology

出　　处：《Chinese Science Bulletin》2013年第28期3588-3594,共7页

基　　金：supported by the State Key Project of Petroleum(2008ZX05005-001-009HZ);the National Natural Science Foundation of China(41172126);the State Key Laboratory of Petroleum Resources and Prospecting(PRP2010-01);the Science Foundation of China University of Petroleum(LLYJ-2011-05 and KYJJ-2012-01-01)

摘　　要：The main reservoirs of Majiang fossil deposits consist of the Silurian Wengxiang group,dominantly sandstones,and the Ordovician Honghuayuan formation,dominantly carbonate rocks,and the Lower Cambrian Niutitang Formation mudstones serve as the major source rocks.Thermochemical sulfate reduction(TSR)might have taken place in the Paleozoic marine carbonate oil pools,as indicated by high concentrations of dibenzothiophenes in the extracts(MDBT=0.27 4.32 g/g extract,and MDBT/MPH=0.71 1.38).Hydrocarbons in the Pojiaozhai Ordovician carbonate reservoirs have undergone severe TSR and are characterized by higher quantities of diamondoids and MDBT and heavier isotopic values(13C=28.4‰).The very large amounts of dibenzothiophenes might be products of reactions between biphenyls and sulfur species associated with TSR.The main reservoirs of Majiang fossil deposits consist of the Silurian Wengxiang group, dominantly sandstones, and the Ordovician Honghuayuan formation, dominantly carbonate rocks, and the Lower Cambrian Niutitang Formation mudstones serve as the major source rocks. Thermochemical sulfate reduction （TSR） might have taken place in the Paleozoic marine carbonate oil pools, as indicated by high concentrations of dibenzothiophenes in the extracts （MDBT=0.27-4.32 mg/g extract, and MDBT/MPH= 0.71-1.38）. Hydrocarbons in the Pojiaozhai Ordovician carbonate reservoirs have undergone severe TSR and are characterized by higher quantities of diamondoids and MDBT and heavier isotopic values （δ13C=-28.4‰）. The very large amounts of dibenzothiophenes might be products of reactions between biphenyls and sulfur species associated with TSR.

关 键 词：硫酸盐 热化学 分子标记 化石 碳酸盐岩油气藏 奥陶纪 碳酸盐岩储层 二苯并噻吩 

分 类 号：P618.13[天文地球—矿床学]