Hydrocarbon Charge History of Yingdong Oilfield,Western Qaidam Basin
Gui Lili
Liu Keyu
Liu Shaobo
Sun Weifeng
Meng Qingyang
Yuan Li
Wu Fan
Hao Jiaqing
Abstract：The Yingdong oilfield,western Qaidam basin,is an important petroleum exploration front in the basin.However, the distribution of oil-gas-water is complex due to the complex structures and the pervasive faulting in the reservoirs and the pe-troleum accumulation process is still to be probed in detail.The petroleum accumulation process in the area was investigated by using an integrated grain fluorescence,fluid inclusion and organic geochemical analyses in this study.The results show follows:(1)There were two episodes of oil charge in N12-N22 ,as reflected by three types of hydrocarbon inclusions,occurred in around 12 Ma and 5 Ma,respectively.(2)The current oil accumulations in the oilfield derived from upward migration of palaeo-oil res-ervoirs in the depth are from the same sources.(3)The QGF index which is larger than 2 and the development of yellow fluo-rescent hydrocarbon inclusions with low mature crude oil indicate that there existed crude oil with low maturity recharge in the early stage.Such crude oil came from the same low mature oil source and there is no high mature oil in the source.The decrea-sing of light component with increasing buried depth indicates that the blue fluorescent hydrocarbon inclusions and gas hydro-carbon inclusions resulted from the late tectonic activity and the fault adjusted upward migration degassing channel system.The Yingdong oilfield has great exploration potential because of the inheritance structural development and the occurrence of two ep-isodes of hydrocarbon accumulations.
Keywords：Yingdong oilfieldhydrocarbon charge historyquantitative grain fluorescencefluid inclusioninfrared spectrosco-pypetroleum geologyQaidam basin
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 890-899 )