中国地质2012，Vol.39Issue(1)：96-105,10.
川西坳陷中段中侏罗统上沙溪庙组层序岩相古地理及砂体展布特征
Sedimentary facies and sand body distribution of the Middle Jurassic Upper Shaximiao Formation in the middle segment of western Sichuan depression
摘要
Abstract
Guided by the theory of high-resolution sequence stratigraphy, based on the classification of base level cycle sequence, and aimed at the distribution characteristics of sand bodies, this paper has divided Upper Shaximiao Formation into base level cyclic sequences of one long period (LI) and four moderate periods (Ml, M2,M3,M4). Sequence -based lithofacies and paleogeographic maps of Upper Shaximiao Formation were compiled on the basis of mapping units of middle period base level cyclic sequence. The result shows that meandering river delta fades and lake facies were developed during the stage of Ml and M2. During the stage of M3 and M4, the depositional setting was changed and characterized by the development of alluvial fan facies, alluvial plain facies, braided river delta facies and lake facies. The sand bodies were distributed in two areas, I.e., Dayi-Wenjiang area and Zhongjiang area: the former occurred during the stage of Ml, M3 and M4, whereas the latter came into existance during the stage of Ml ,M2 and M3.关键词
层序岩相古地理/砂体展布/上沙溪庙组/川西坳陷中段Key words
sequence-based lithofacies and paleogeography/ sand body distribution/ Upper Shaximiao Formation/ Millde segment of western Sichuan depression分类
天文与地球科学引用本文复制引用
李国新,徐胜林,陈洪德,时志强,高山..川西坳陷中段中侏罗统上沙溪庙组层序岩相古地理及砂体展布特征[J].中国地质,2012,39(1):96-105,10.基金项目
国家自然科学基金重点项目(40739901)资助. （40739901）
