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《Fault-Block Oil & Gas Field》 2018-03
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Sequence stratigraphy and grain shoal characteristics of Feixianguan Formation in Xuanhan-Daxian zone

XIE Shengyang;WANG Xingzhi;MEI Qiuyong;HUO Fei;LI Yong;CHEN Yuqiao;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu University of Technology;School of Geoscience and Technology,Southwest Petroleum University;Pudong Oil Production Plant,Zhongyuan Oilfield Company,SINOPEC;  
Based on the study of precise observation and description of core and outcrops, with the analysis of seismic stratigraphic comprehensive interpretation, the Feixianguan Formation in the Xuanhan-Daxian zone, northeastern Sichuan, can be divided into 2 third-order sequences, eight system tracts in terms of sedimentary facies and sequence interfaces. At the same time, the vertical and horizontal developmental characteristics and the distribution of different system tracts of the sequences and shoal were studied.Results show that, during the development of TSQ1 sequence, grain shoales, mostly platform margin shoales, mainly developed during the highstand system tracts and have the characteristics of thickening and coarsening upward, but the thickness of single shoal varies greatly; the distribution of shoales is unstable horizontally, and migrates upward toward south in developing stratum on the profile, which expands in the direction of northwest-southeast along the platform margin; during the development of TSQ2 sequence, due to the effect of filling, PG area evolved into restricted platform; grain shoals developed mainly in the early of highstand system tract, which are platform inner shoals, and these shoales were thin in thickness and expands in the direction of northeast-southwest.
【Fund】: 国家科技重大专项专题“四川盆地二、三叠系构造-沉积演化及储层形成机制研究”(2016ZX05007-004-001);; 中国石油科技创新基金项目(2015D-5006-0107);; 油气藏地质及开发工程国家重点实验室开放基金(PLN201613)
【CateGory Index】: P618.13
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