Tectonic-sedimentary analysis of Shabei area in Bozhong depression
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TE112.31
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Abstract:
Based on the approach of tectonic-sedimentary analysis and the basin tectonic activity,the filling response of paleogene tectonic-sedimentary and its evolution process in great details were studied by 3D seismic and drilling data of the Shabei area in Bozhong depression. Furthermore,combined with the corresponding relationship among the lithofacies,seismic facies and seismic attributes,the tectonic-sedimentary evolution regularity in time-space was discussed. Five types of ancient valley systems(U-type,W-type,V-type valleys,single fault trough,and double fault trough),and four types of tectonic break zones(cliff type,ramp type,synthetic and antithetic fault terrace types)developed in the study area. The sandtransport ability of different ancient valleys varies,so the scale of its corresponding fan body differs as well;sedimentary build-up varies with different slope broken zones. The sand-rich fan delta and mud-rich coastal shallow-lake developed during Shahejie Formation deposited in the study region,whose provenance came from the near source system of Shijiutuo uplift and Shaleitian uplift. However,not only the fan delta developed during Dongying Formation sedimentary period,but also the braided river delta began to develop,which included two main provenance systems(the near source system of Shijiutuo uplift and Shaleitian uplift)and the far source system of northern paleo-Luan River.
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Wang Yongli, Chen Shuguang. Tectonic-sedimentary analysis of Shabei area in Bozhong depression[J]. Petroleum Geology and Recovery Efficiency,2015,22(4):26~32