High-resolution sequence stratigraphy and sedimentary characteristics of the Member 3 of Qingshankou Formation of Upper Cretaceous in Qian'an area, south Songliao Basin
Wang Jun1, 2, Bao Zhidong1, 2, Wang Yunlong3, Hua Songtao3, Yang Yichun1, 2, He Lingyuan1, 2, Wang Xiaotao1, 2, Zhang Yunyi4
1 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 2 State Key Laboratary of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249; 3 Fuyu Oil Production Plant,Jilin Oilfield Company,PetroChina,Songyuan 138000,Jilin ; 4 Changqing Downhole Technology Service Company of CNPC Chuanqing Drilling Engineering Co.,Ltd.,Xi'an 710018,Shaanxi;
Abstract：Integrated with core and logging data,the recognition marks of high resolution sequence stratigraphic boundary of the Member 3 of Qingshankou Formation of Upper Cretaceous in Qian'an area of south Songliao Basin is summarized systematically. The high￣resolution sequence is established. Moreover, the stacking pattern of the strata in the framework of high-resolution sequence stratigraphy is discussed and the characteristics of sand distribution and disciplines of sedimentary facies evolution in the sequence framework is analyzed. Several conclusions are made as follows. Three sequence boundaries and two supporting evidences have been recognized in the study area,such as erosion surface,stranded sediments at the bottom of the deposit,slump deposit, switched color of mudstone and differences in petroliferous. Then the Member 3 of Qingshankou Formation is divided into two 3rd-order sequences(SQ1,SQ2)and thirteen 4th-order sequences(HFSQ1-HFSQ13),and each of the sequence can be divided into lake transgressive system tract(LTST)and lake regressive system tract(LRST). Five types of the 4th-order sequence structure have been recognized in the system tract. The process of lake level fluctuation can be divided into four stages,and the combination model of 4th-order sequences in each stage is different. Based on the analysis of sand correlation in cross-section and facies distribution, according to the phase division of lake level fluctuation,four types of sedimentary model have been recognized in the framework of high-resolution sequence stratigraphy. Each model has its unique sand distribution feature in vertical direction and shape in horizontal direction.
Wang Jun,Bao Zhidong,Wang Yunlong et al. High-resolution sequence stratigraphy and sedimentary characteristics of the Member 3 of Qingshankou Formation of Upper Cretaceous in Qian'an area, south Songliao Basin[J]. JOPC, 2017, 19(2): 327-340.
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