地质论评2018，Vol.64Issue(2)：347-360,14.DOI:10.16509/j.georeview.2018.02.004
龙门山褶皱冲断带典型地震剖面平衡剖面恢复及构造演化分析
Analysis of Typical Seismic Profile and Balanced Cross-section Recovery and Tectonic Evolution in the Longmenshan Fold—Thrust Belt
摘要
Abstract
Objectives:In recent years,the Longmenshan fold—thrust belt is a natural laboratory for domestic and foreign experts and scholars to study complex geological structures.Through the field geological survey,fine seismic structure interpretation,the latest advanced imaging data are used,selecting three typical lines of the Longmenshan northern,middle and southern sections,which is basically vertical toward the strike.With the aid of Geo-sec 2D balanced cross-section technique,the tectonic development and evolution of the Longmenshan fold—thrust belt are analyzed.Through the deeply analysis of the tectonic development and the evolution history of faults,the author have summarized seven tectonic development style and tectonic feature patterns of the northern,middle and southern sections.Methods:This paper carries out research with seismic profile,geological outcrops and balanced cross-section comprehensive analysis and previous research results.Results:Through the in-depth analysis of the tectonic development and the evolution history of faults,the authors have summarized 7 tectonic development patterns and tectonic features of the northern,middle and south sections.By comparing the tectonic development and evolution characteristics of the northern,middle and southern sections,it is confirmed that the Longmenshan fold—thrust belt is a multi-stage structure formed by superposition of multi-stage tectonic movements.The results show that the basement is involved-thrusting,Thrusting thrust,passive roof duplex and other structural styles.Before the early Indo—China movement,the stress environmental mainly was extensional environment,slowly uplifted;and lately was the compressional environment,rapid thrusting uplift and till the Himalayaorogeny period stereotype.Conclusions:On the basis of constructed style analysis,combining the comprehensive evaluation of the petroleum geology and the structural characteristics of gas fields found in the nearby sections,the structural styles of the favorable oil and gas are predicted.The passive fault-bend and fault-propagation folds,passive roof duplex,back thrusts are favorable structural styles of oil and gas exploration.关键词
褶皱冲断带/平衡剖面/地球物理/演化特征/油气预测/龙门山Key words
fold—thrust belt/balanced cross-section profile/geophysics/evolution characteristics/hydrocarbon prediction/Longmenshan引用本文复制引用
范增辉,刘树根,范存辉,胡林辉,李文佳,米鸿,韩翀,韩小俊..龙门山褶皱冲断带典型地震剖面平衡剖面恢复及构造演化分析[J].地质论评,2018,64(2):347-360,14.基金项目
本文为国家重大专项“大型油气田及煤层气开发”(编号:2017ZX05035003)和四川省应用基础研究项目(编号:2017JY0176)资助成果.This study was financially supported by National Science and Technology major project " large-scale oil—gas and coal-bed methane development" (No:2017ZX05035003) and Application of Basic Research Projects of Sichuan Province (No:2017JY0176). （编号:2017ZX05035003）
