Geochemical studies of the Silurian oil reservoir in the Well Shun-9 prospect area, Tarim Basin, NW China

查看全文 作　　者：Song [1]Daofu;Li [1]Meijun;Wang T.–[1]G

机构地区：[1]State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum

出　　处：《Petroleum Science》索引2013年第10卷第4期,共10页

基　　金：the Northwest Branch Company, SINOPEC for access to samples and grant support 摘　　要：Commercial oil flow has been obtained from the sandstone reservoir of the Lower Silurian Kelpintag Formation in the Well Shun-9 prospect area.In the present studies,10 Silurian oil and oil sand samples from six wells in the area were analyzed for their molecular and carbon isotopic compositions,oil alteration(biodegradation),oil source rock correlation and oil reservoir filling direction.All the Silurian oils and oil sands are characterized by low Pr/Ph and C21/C23 tricyclic terpane(<1.0) ratios,'V'-pattern C27-C29 steranes distribution,low C28-sterane and triaromatic dinosterane abundances and light δ13C values,which can be correlated well with the carbonate source rock of the O3 l Lianglitage Formation.Different oil biodegradation levels have also been confirmed for the different oils/oil sands intervals.With the S1k2 seal,oils and oil sands from the S1k1 interval of the Kelpintag Formation have only suffered light biodegradation as confirmed by the presence of 'UCM' and absence of 25-norhopanes,whereas the S1k3-1 oil sands were heavily biodegraded(proved by the presence of 25-norhopanes) due to the lack of the S1k2 seal,which suggests a significant role of the S1k2 seal in the protection of the Silurian oil reservoir.Based on the Ts/(Ts+Tm) and 4-/1-MDBT ratios as reservoir filling tracers,a general oil filling direction from NW to SE has been also estimated for the Silurian oil reservoir in the Well Shun-9 prospect area. 关键词：塔里木盆地志留系远景区化学研究油藏地球中国碳同位素组成

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Geochemical studies of the Silurian oil reservoir in the Well Shun-9 prospect area, Tarim Basin, NW China

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