石油实验地质2017，Vol.39Issue(1)：58-64,7.DOI:10.11781/sysydz201701058
四川盆地川西坳陷中段须四段层序结构特征
Sequence characteristics of the fourth member of Xujiahe Formation in the middle area of Western Sichuan Depression, Sichuan Basin
摘要
Abstract
The sequence characteristics of the fourth member of Xujiahe Formation in the middle area of Western Sichuan Depression have been studied by using outcrop, core, logging and seismic data. The fourth member of Xu⁃jiahe Formation is a three⁃order sequence and was divided into lowstand system tract, transgressive system tract and highstand system tract. An isochronous sequence stratigraphic framework was established, and its internal sedimen⁃tary characteristics were clarified, mainly developing an alluvial fan-alluvial plain-delta-lacustrine depositional system. The sequence was divided into three types based on depositional settings:symmetrical type, asymmetrical type A1 and A2. Type A1 developed in the piedmont region before the Longmen Mountain, the type A2 mainly developed in Zhongjiang-Luodai area, and the symmetrical type mainly developed in the piedmont region before the Longmen Mountain and the depression between Zhongjiang and Luodai. LST and HST of the asymmetric type and symmetric type A2 sequence were advantageous for the development of high⁃quality reservoirs.关键词
层序地层格架/层序结构/须四段/三叠系/川西坳陷中段/四川盆地Key words
sequence stratigraphic framework/sequence structure/fourth member of Xujiahe Formation/Trias-sic/middle area of Western Sichuan Depression/Sichuan Basin分类
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陈贤良,纪友亮,杨克明..四川盆地川西坳陷中段须四段层序结构特征[J].石油实验地质,2017,39(1):58-64,7.基金项目
国家自然科学基金面上项目“地质历史时期碎屑岩储层物性参数恢复的定量研究”（41272157）和西安科技大学博士启动基金项目“前陆盆地层序结构内储层成岩演化特征研究”（2015QDJ075）联合资助。 （）
