煤田地质与勘探2016，Vol.44Issue(6)：21-26,6.DOI:10.3969/j.issn.1001-1986.2016.06.004
川东南构造变形特征及其对页岩气保存的影响
Structure deformation of southeast Sichuan and its influences on preservation of shale gas
摘要
Abstract
The structure in southeast Sichuan is complicated, and there are abundant shale gas resources in Per-mian and Silurian strata. Based on the analysis of lithology and interpretation of seismic data, Cambrian gyp-sum-salt layer and Middle-Lower Triassic gypsum-salt layer had important control action to structural deforma-tion, most faults sliped along gypsium-salt layer. The study area includes two parts: inner basin and basin margin. In inner basin symmetric folds with decollement of overlying strata were developed, basin margin was featured by structure of base-involved fold and thrust fault, and can be distinguished as piedmont nappe zone and pied-mont conversion zone. High-steep triangle wedge was developed in piedmont nappe zone. Conversion zone can be divided into thrust belt, fold belt and slope belt. Analysis of structure evolution showed that in Late Jurassic Qiyueshan fault started developing, the strata in inner basin were bended and deformed. In Cretaceous triangle wedge was formed in basin margin, and main folds and faults had been already developed in inner basin. In Ce-nozoic Qiyueshan mountain was folded and uplifted, and several anticlines and synclines were formed in sedi-mentary cover above Cambrian in inner basin. In piedmont nappe zone, high-steep structure and intense defor-mation led to the poor preservation condition of shale gas. In piedmont conversion zone, moderate deformation led to the good preservation condition of shale gas, especially in fold belt. Due to the good sealing-capping property of gypsum-salt bed of Middle-Lower Triassic, anticlines with suitable burial depth are the favorable exploration targets.关键词
川东南/三角楔构造/山前转换带/构造演化/页岩气保存Key words
southeast Sichuan/triangle wedge structure/piedmont conversion zone/structure evolution/preservation of shale gas分类
天文与地球科学引用本文复制引用
郭卫星,熊亮,魏力民..川东南构造变形特征及其对页岩气保存的影响[J].煤田地质与勘探,2016,44(6):21-26,6.基金项目
中石化重大导向项目(13KT-14)@@@@Significant guide project of SINOPEC(13KT-14) （13KT-14）
