巴楚断隆西段古董山构造带断层封堵性与油气成藏的关系  

Relationship between sealing characteristics of Gudongshan tectonic belt and hydrocarbon accumulation in west part of Bachu fault-rift area

作　　者：赵明[1,2,3] 王华[1] 余腾孝[3] 曹自成[3] 岳勇[1] 

机构地区：[1]中国地质大学(武汉)资源学院,湖北武汉430074 [2]中国地质大学(武汉)构造与油气资源教育部重点实验室,湖北武汉430074 [3]中国石化西北油田分公司,新疆乌鲁木齐830011

出　　处：《中南大学学报（自然科学版）》2009年第4期1099-1105,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(40702023);中国地质大学(武汉)构造与油气资源教育部重点实验室基金资助项目(2007年)

摘　　要：对塔里木盆地巴楚隆起西段古董山断裂带断裂封堵性以及断裂封堵、开启与油气成藏关系进行分析,参考领区色力布亚断裂南段亚松迪油气藏,最终确定该断裂上、下盘油气成藏可能性。研究结果表明:穹塔克—古董山断层上盘断背斜下奥陶统碳酸盐储层(T81～T74),侧向封堵条件差,油气成藏的可能性不大;而断层下盘中下奥陶统储层(T81～T74)在该断层活动期间,纵向不封闭,构成油气运移通道,断层停止活动后,由于其正压力大而使它很快紧闭,加之逆掩推覆,寒武系膏盐岩直接披盖其上,断层封堵性较好,有利于油气藏的保存。By analyzing factors which influence sealing characteristics as the normal pressure on two fault walls, lithology co-relationship, and gypsum mudstone smear analysis, the fault sealing characteristics were studied. Integrated fault sealing characteristics and fault sealing, opening, and its relation with hydrocarbon accumulation were researched in Gudongshan tectonic belt of west part of Bachu fault-rift area in Tarim Basin, and therefore the hydrocarbon accumulation possibility of the two fault walls was predicted. The results indicate that, because of the bad laterally hydrocarbon reservoir condition, the hydrocarbon accumulation of lower Ordovician carbonate reservoir （T8^1--T7^4） of hanging-wall faulted-anticline in Qiongtake-Gudongshan Fault has a little possibility. While, during the fault activity period, because of its low content of gypsum mudstone and its laterally non-sealing condition, mid-lower Ordovician reservoir （T8^1--T7^4） of footwall in Qiongtake-Gudongshan Fault, forms a pathway for oil and gas transportation. However, after the fault＇s activity, the positive pressure was too high to seal the pathway. Owing to this normal pressure together with overthrust nappe, Cambrian gypsum rock covers on it directly to form a good sealing section which is good for the hydrocarbon reservoir.

关 键 词：巴楚 古董山构造带 断裂封堵性 油气成藏 

分 类 号：TE112[石油与天然气工程—油气勘探]