Sand body architecture and controlling factors of shallow water delta in the Member 2 of Xujiahe Formation in Xinchang structural belt,western Sichuan Basin
DENG Wenlong1, YE Tairan1, JI Youliang2,3, ZHOU Yong2,3, WAN Hongfeng2,3, REN Yutao2,3
1 Southwest Petroleum Brach Company,Sinopec,Chengdu 610081,China; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China; 3 National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China
Abstract：The sand bodies of the Member 2 of the Upper Triassic Xujiahe Formation in the Xinchang structural belt of western Sichuan Basin are widely distributed,with various types of sand bodies and large thickness differences. This results in uneven distribution of interlayer barrier bed and intraformational bed in gas reservoirs,and strong reservoir heterogeneity. Therefore,it is crucial to investigate the sedimentary microfacies,distribution characteristics and architecture of reservoir sand bodies,so as to lay a foundation for the following reservoir prediction and efficient gas reservoir development. Using core,well logs,3D seismic and laboratory data,and guided by the theory of high-resolution sequence stratigraphy proposed by T.A. Cross,the authors systematically examined the structural characteristics and controlling factors of sand bodies in the second member of Xujiahe Formation in the Xinchang structural belt,western Sichuan Basin. The results show that: The study area was largely located in a shallow water delta front environment,which consists mainly of subaqueous distributary channel sand bodies with subordinate mouth bar sand bodies. These channel sand bodies are characterized by frequent lateral migration,multiple vertical amalgamation and extensive areal coverage. It is concluded that in the study area there are two main categories and nine subcategories of sand body vertical stacking patterns and three lateral contact patterns. The structural characteristics and development patterns of sand bodies are controlled mainly by base-level fluctuation and river energy. Finally,the sedimentary facies and sand body development model of the Xinchang structural belt in western Sichuan Basin are established,which has important applications for guiding exploration and development of gas reservoirs in similar settings.
DENG Wenlong,YE Tairan,JI Youliang et al. Sand body architecture and controlling factors of shallow water delta in the Member 2 of Xujiahe Formation in Xinchang structural belt,western Sichuan Basin[J]. JOPC, 2024, 26(3): 545-566.
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