Petroleum Science >2013,??Issue 4:??432-441 DOI: https://doi.org/10.1007/s12182-013-0293-2
Geochemical studies of the Silurian oil reservoir in the Well Shun-9 prospect area, Tarim Basin, NW China Open?Access
文章信息
作者：Song Daofu,Li Meijun and Wang T.–G
作者單位：
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China;State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102250, China;State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102251, China
投稿時間：2013-08-08
引用方式：Song, D., Li, M. & Wang, TG. Pet. Sci. (2013) 10: 432. https://doi.org/10.1007/s12182-013-0293-2
文章摘要
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 O3l 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.
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.
關鍵詞
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Silurian oil reservoir, Well Shun-9 prospect area, geochemistry, oil?source rock correlation, alteration, oil reservoir filing direction