塔里木盆地玛扎塔格构造带断裂构造分析  

ANALYSIS ON THRUSTINGS OF THE MAZHATAGE STRUCTURAL BELT IN THE TARIM BASIN

作　　者：杨海军[1] 李曰俊[2] 冯晓军[3] 郑民[2] 张春莲[3] 赵岩[2] 

机构地区：[1]中国地质大学,武汉430074 [2]中国科学院地质与地球物理研究所,北京100029 [3]中国石油天然气股份有限公司塔里木油田分公司,新疆库尔勒841000

出　　处：《地质科学》2007年第3期506-517,共12页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家重点基础研究发展计划(973项目;编号:2006CB202301);中国科学院知识创新工程重要方向项目(编号:KZCX3-SW-147);国家"十五"重点科技攻关项目(编号:2004BA616A02)共同资助

摘　　要：玛扎塔格构造带是麦盖提斜坡与巴楚断隆之间的一条边界断裂带,其中已发现和田河气田。断裂构造对于圈闭的形成和油气运聚成藏具有决定性的制约作用。通过系统的地震剖面解释,在玛扎塔格构造带识别出3期断裂构造:第1期构造活动以中寒武统的膏盐层为主滑脱面,由麦盖提斜坡向巴楚断隆冲断,伴生有断层传播褶皱发育,形成于新生界沉积之前,玛扎塔格背斜形成;这期冲断构造是本次研究的一个新发现。第2期活动为基底卷入型挤压走滑断裂,由相互背冲、近于平行的玛南断层和玛北断层组成,形成于中新世末,玛扎塔格背冲断块背斜形成。第3期活动以古近系底部的膏盐层为主滑脱面,由麦盖提斜坡向巴楚断隆冲断,也伴有断层传播褶皱发育,形成于更新世—全新世。在此基础上讨论了区域构造演化对玛扎塔格构造带3期断裂活动的形成和发育的控制。The Mazhatage structural belt is a boundary between the Markit Slope and the Bachu Fault-Uplift in the Tarim Basin. The Hetianhe （Hetian River） Gasfield was discovered in Markit-Bachu area, and the fault structures were one of the dominant factors for trap-formation and hydrocarbon migration and accumulation. On the basis of seismic section interpretation, 3 generations of thrusting structures were recognized in the Mazhatage structural belt. The first generation occurred in Late Cretaceous or towards the end of Cretaceous, when the detachment occurred along the Middle Cambrian gypsum-sah layer and the strata thrust from Markit to Ba- chu, accompanied with the fault-propagation folding, which resulted in creation of the Mazhatage anticline belt. The second generation occurred towards the end of Miocene, when the basement-involved faults formed, composed of the parallel South Mazhatage and North Mazhatage fractures, and the both making up a back-thrust structure. The third generation developed in Pleistocene to Holocene. In this period, the Cenozoic rocks detached and slided along the basal gypsum-salt layer of the Paleogene, and over-thrust northeastwards, from the Markit Slope to the Bachu Fault-Uplift. The faut-propagation fold was formed in the upper wall of the thrust in the neotectonic period. Based on what mentioned above, the relation between development of the Mazhatage structural belt and the regional tectonic evolution in Late Mesozoic and Cenozoic was explored.

关 键 词：玛扎塔格构造带 3期冲断活动 基底卷入断层 盖层滑脱冲断层 巴楚断隆 塔里木盆地 

分 类 号：P542[天文地球—构造地质学]