塔里木盆地玉北冲断带分期活动特征及其控油气作用  

Poly-phase fault activities and the control on hydrocarbon accumulation of Yubei thrust belt,Tarim basin

作　　者：陈刚[1,2] 汤良杰[1,2] 余腾孝[3] 杨勇[1,2] 岳勇[3] 郭颖[1,2] 张旭光[3] 潘玉芳[1,2] 赵彬彬[1,2] 

机构地区：[1]中国石油大学油气资源与探测国家重点实验室,北京102249 [2]中国石油大学盆地与油藏研究中心,北京102249 [3]中国石化西北油田分公司,乌鲁木齐830011

出　　处：《中国矿业大学学报》2014年第5期870-879,共10页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(41172125;40972090);国家重点基础研究发展计划(973)项目(2012CB214804);国家科技重大专项(2011ZX05002-003-001;2011ZX05229-002;2011ZX05002-006-007HZ);中国石油化工股份有限公司项目(P11086);中石化西北油田分公司项目(KY2012-S-051)

摘　　要：通过三维地震资料解释,对塔里木盆地玉北地区断裂特征进行了详细分析,提出该区主断裂在加里东中期早幕已开始活动,厘定了加里东早期、加里东中期早幕、加里东中期Ⅰ幕、加里东中期Ⅲ幕、加里东晚期—海西早期、海西晚期、喜马拉雅期等7个断裂活动期次.玉东1和玉东2断裂带加里东中期以后基本不再活动,玉北7、玉北1、玉东3和玉东4断裂带加里东中期以后仍有继承性活动.总体看,加里东中期断裂活动强烈,后期断裂活动性变弱.呈NE走向的6排断裂带,总体具有东强西弱、北强南弱的活动特点.玉北地区基底断裂和古生界滑脱断裂在中、下寒武统盐岩层内的对接,构成油气向上运移的主要通道,但不同时期断裂活动对油气的控制有差异.加里东中期、海西晚期、喜马拉雅期断裂活动对油气成藏具有建设性作用,其中海西晚期断裂活动对油气成藏有利,喜马拉雅期断裂活动主要影响油气调整.Through a profound interpretation of 3D seismic data, this study provided a detailed analysis of the fault characteristics of Yubei thrust belts, proposed that it was active at early episodes of Middle Caledonian of the main faults. Seven structure stages were redefined, that is, Early Caledonian, Middle Caledonian Early Episodes, I Episodes of Middle Caledonian, III Episodes of Middle Caledonian, Late Caledonian-Early Hereynian, Late Hercynian and Hima- layan. Furthermore, they can be divided into 2 types on the basis of the differential of structure stages： 1） inactive after Middle Caledonian; and 2） active after Middle Caledonian. The faults were of strong activities in Middle Caledonian, and then became weak. In a whole, the move- ment of the faults is stronger in the north than in the south across the strike, and more intense in the east than in the west among the 6 NE strike thrust belts. The basement faults and decol- lement thrust faults consist of the migration pathway to cross the gypsum rock and salt rock of the middle and lower Cambrian in the form of docking together, because of which were stable distribution and high sealing performance. But it is different to the controls of Poly-phase fault activities on hydrocarbon accumulation. The faults activities in Middle Caledonian, Late Her- cynian and Himalayan were beneficial to the hydrocarbon migration and accumulation. Espe- cially, the Hercynian faults are the most advantageous for the hydrocarbon reservoir, and the Himalayan faults are the main influence on the adjustment of hydrocarbon.

关 键 词：玉北冲断带 断裂构造 活动期次 控油气作用 塔里木盆地 

分 类 号：P542.3[天文地球—构造地质学]