查干凹陷乌力吉构造带浅层成藏主控因素

Main controlling factors on shallow hydrocarbon accumulation of Wuliji tectonic zone, Chagan Depression

史大海 陈清棠 邱微 郭展 吴小琴

中国石油大学（北京），北京 102249 中国石化中原油田分公司勘探开发科学研究院，河南 濮阳 457001 中国石化中原油田分公司勘探管理部，河南 濮阳 457001

China University of Petroleum, Beijing 102249, China Research Institute of Exploration and Development, Zhongyuan Oilfield Company, SINOPEC, Puyang 457001, China Exploration Management Department, Zhongyuan Oilfield Company,
SINOPEC, Puyang 457001, China

近年来在查干凹陷乌力吉构造带获得了勘探突破，发现了火山岩之上的浅层普通稠油油藏，油源分析表明，该油藏原油主要来自于深层巴音戈壁组的暗色泥岩。对浅层油藏成藏因素的综合分析认为，毛西断层晚期构造反转，形成了良好的油气输导条件，早期形成于构造带深层原生油藏中的原油向上运移至浅层，是浅层成藏的主控因素。同时，构造浅层沉积相类型主要为扇三角洲相和辫状河流相，储层较为发育，为油气富集提供了良好的储集条件；上覆的乌兰苏海组发育大套泥岩，形成了区域性盖层，为浅层油藏的形成提供了良好的封堵条件，从而形成了下生上储的油气成藏模式。

In recent years, shallow ordinary heavy oil reservoir had been detected on the top of volcanic rocks in Wuliji tectonic zone, Chagan Depression. Oil source analysis indicated that the crude oil of oil reservoir was mainly from melanocratic mudstone of deep Bayingebi Formation. By analyzing hydrocarbon accumulation factors of shallow reservoir, it was known that the later tectonic inversion of Maoxi fault had developed favorable conducting system, and crude oil of early native reservoir in deep structural zone has migrated to shallow layer, which was the main controlling factor of shallow hydrocarbon accumulation. Moreover, the types of sedimentary facies of shallow structure are mainly fan dalta and braided river facies, with reservoir developed, which became favorable reservoir condition for petroleum enrichment. A large set of mudstones developed in overlying Wulansuhai Formation has formed regional cap rock, which provides favorable sealing condition for the formation of shallow reservoir and creates the hydrocarbon accumulation pattern with lower source rock and upper reservoir.

10.6056/dkyqt201303012