西昌盆地构造演化及特征研究  

The study on tectonic evolution and characteristics of Xichang basin

作　　者：赵杰[1] 周欣 王燕 孙玮[4] 刘顺[4] ZHAO Jie;ZHOU Xin;WANG Yan;SUN Wei;LIU Shun(Exploration Branch of Daqing Oilfield Co., Ltd, Heilongjiang 163000,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;Jinchuan group co. LTD,Gansu 730020,China;College of Earth Science, Chengdu University of Technology, Chengdu 610059, China)

机构地区：[1]大庆油田有限责任公司勘探分公司,黑龙江163000 [2]成都理工大学油气藏地质及开发工程国家重点实验室,成都610059 [3]金川集团有限公司,甘肃730020 [4]成都理工大学地球科学学院,成都610059

出　　处：《物探化探计算技术》2020年第5期651-659,共9页Computing Techniques For Geophysical and Geochemical Exploration

摘　　要：西昌盆地为四川盆地周缘最有勘探潜力的盆地之一,但其构造复杂,油气地质条件不明。这里根据野外踏勘资料与地震剖面解释成果对比,结合区域地质背景对西昌盆地构造特征进行了综合分析。分析认为西昌盆地构造演化可分为:①晚震旦系—晚志留系被动大陆边缘稳定克拉通盆地发展阶段;②泥盆—石炭纪海西运动整体隆升剥蚀阶段;③二叠系被动大陆边缘稳定克拉通盆地发展阶段;④早中三叠系印支运动隆升剥蚀阶段;⑤晚三叠系—晚白垩系末陆相盆地形成阶段;⑥喜马拉雅期挤压隆升,盆地变形改造阶段等六个阶段。西昌盆地腹地主要发育近南北向、北西向和北东向三组构造,其中以近南北向构造为主,总体表现为隔挡式褶皱和走滑—逆冲断裂构造格局。盆地大地构造位置属于康滇基底杂岩带,横跨康滇地轴和凉山台坳两个Ⅱ级构造单元,可根据构造形态与发展特征将西昌盆地进一步细分为炭山背斜带、西河乡—尔乌背斜带、七里坝背斜带、罗木大山背斜带和四开背斜带等五个Ⅳ级构造带。The Xichang Basin is one of the most exploration basins in the periphery of the Sichuan basin,but the structure is complex and the oil and gas geological conditions are unknown.According to the comparison between the field survey data and the seismic section interpretation results,combined with the regional geological background,the structural characteristics of the Xichang basin are comprehensively analyzed.It is believed that the tectonic evolution of the Xichang basin can be divided into six stages:including 1)the late Sinian to late Silurian passive continental margin stable craton basin development Stage,2)from devonian to carboniferous Haixi movement,overall uplift and denudation stage,3)Permian passive continental margin,stable Craton basin development stage,4)early middle triassic indosinian uplift and erosion stage,5)Late triassic to late the formation of the late cretaceous continental basin,and 6)the Himalayan extrusion and the basin deformation and reconstruction stages.Three groups of structures are developed in the Xichang basin:namely,the north-south direction,the northwest direction,and the north-east direction.This basin has the near-south-north-trending structure as the main structure,and the overall performance is the barrier-type fold and the strike-slip-thrust fault structure.The geotectonic location of the basin belongs to the Kangyu basement complex belt,which spans the gradeⅡtectonic units of the Kangxi axis and the Liangshan platform.The Xichang basin can be further subdivided into five grade IV tectonic belts according to the tectonic form and development characteristics,such as Tanshan anticline,the Xihe-Erwu anticline,the Qiliba anticline,the Luomudashan anticline and the Sikai anticline.

关 键 词：构造演化 构造单元 康滇地轴 凉山台坳 西昌盆地 

分 类 号：P631.4[天文地球—地质矿产勘探]