石油勘探与开发2017，Vol.44Issue(5)：659-669,11.DOI:10.11698/PED.2017.05.01
四川盆地万源—达州克拉通内裂陷的发现及勘探意义
Discovery of Wanyuan-Dazhou Intracratonic Rift and its exploration significance in the Sichuan Basin, SW China
摘要
Abstract
With the development of gas exploration of the Sinian-Cambrian strata in the Sichuan Basin,creative understandings of geology were achieved.An N-E trending intracratonic rift was found in the Wanyuan-Dazhou area,northeastern Sichuan Basin.Based on seismic interpretation data,outcrop data and analysis of regional structural geological background,studies on the boundary,distribution,formation and evolution history of Wanyuan-Dazhou rift were carried out,and the significance on exploration was discussed.The following findings were obtained.(1) The seismic section indicated that a steep-slope belt was developed in the first and second members (Z2dn1-Z2dn2) of the Dengying Formation of the Sinian System,showing platform edge facies.The rift generally strikes in NE direction.(2) The thicknesses of the first and second members of the Dengying Formation are thicker than the third and fourth members (Z2dn3-Z2dn4) at the rift periphery,while it came to the opposite conclusion at the inside of the rift.(3) The rift formed in Z2dn1-Z2dn2 of Sinian deposition period.Filling and subsidence occurred in Z2dn3-Z2dn4 of Sinian deposition period.The shrinkage stage was the deposition period of the Early Cambrian Maidiping Formation-Qiongzhusi Formation.The formation of the rift was controlled by the Nanhua rift and regional uplift.The finding of the Wanyuan-Dazhou rift changed the traditional understanding of the Sinian-Early Cambrian tectonic sedimentary framework,and the rift will be the significant exploration direction in the future due to its superior natural gas accumulation conditions in the Sinian.关键词
四川盆地/川东北地区/万源—达州/震旦纪—早寒武世/克拉通内裂陷/岩相古地理/构造运动Key words
Sichuan Basin/Northeastern Sichuan/Wanyuan-Dazhou/Sinian-Early Cambrian/intracratonic rift/lithofacies paleogeography/tectonic movement分类
能源科技引用本文复制引用
赵文智,魏国齐,杨威,莫午零,谢武仁,苏楠,刘满仓,曾富英,武赛军..四川盆地万源—达州克拉通内裂陷的发现及勘探意义[J].石油勘探与开发,2017,44(5):659-669,11.基金项目
国家科技重大专项(2016ZX05007) （2016ZX05007）
