Sedimentary Facies and Reservoir Evaluation of Xueshan Formation of Upper Jurassic in Tuonamu Area, Qiangtang Basin, Tibet

Abstract

Abstract: Shuanghu-Tuonamu area in Qiangtang basin is situated in northern Tibet plateau, along Qiangbei depression and central uplift zone, with widespread Xueshan formation deposits of Upper Jurassic. Two sedimentary associations in its vertical structure appear one coarsen-upward filling sequence. Delta and alluvial fan facies are developed in the first member and second member of Xueshan formation, respectively. The delta facies includes two subfacies of delta front and delta plain. The subfacies of delta front consists of the microfacies of distributary channel, mouth bar, distal bar and interdistributary bay; the subfacies of delta plain consists of the microfacies of natural levee and distributary channel. The alluvial fan facies include the subfacies of outside fan and middle fan. The reservoir analysis shows that the reservoir quality of the second member of Xueshan formation belongs to medium reservoir, better than that of the first member of Xueshan formation.

Key words: Qiangtang basin, Upper Jurassic, sedimentary facies, delta facies, reservoir

CLC Number:

WEI Yu-shuai, WANG Cheng-shan, JIN Wei, LI Ya-lin. Sedimentary Facies and Reservoir Evaluation of Xueshan Formation of Upper Jurassic in Tuonamu Area, Qiangtang Basin, Tibet[J]. Xinjiang Petroleum Geology, 2008, 29(4): 469-474.

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