吐哈盆地鲁克沁构造带二叠系—三叠系油气成藏特征与主控因素  

Characteristics and main controlling factors of hydrocarbon accumulation of Permian-Triassic in Lukeqin structural zone,Tuha Basin

作　　者：武超[1] 李宏伟 盛双占 程甜 师效飞[1] 姜萌蕾 Wu Chao;Li Hongwei;Sheng Shuangzhan;Cheng Tian;Shi Xiaofei;Jiang Menglei(Research Institute of Exploration&Development,PetroChina Tuha Oilfield Company)

机构地区：[1]中国石油吐哈油田公司勘探开发研究院

出　　处：《中国石油勘探》2021年第4期137-148,共12页China Petroleum Exploration

基　　金：中国石油天然气股份有限公司勘探与生产分公司科技项目“吐哈探区重点勘探领域综合评价与有利预探目标优选”(kt2017-08-04-1、kt2021-06-05)。

摘　　要：吐哈盆地二叠系—三叠系油气资源潜力大、剩余资源量多,勘探程度低,托克逊凹陷、三堡凹陷、台北凹陷取得零星油气突破,目前勘探主要集中在库木凸起鲁克沁构造带。研究认为,鲁克沁大型复合鼻状凸起带是吐哈盆地二叠系—三叠系油藏最为富集的领域,该构造带构造地层格架复杂,油藏类型多。围绕古凸起的地层上超、断陷回返褶皱、不整合、断陷扇体等有利于形成多种复合圈闭,这些有利条件决定了鲁克沁大型鼻状凸起复式油气聚集带的成藏特征。通过梳理明确了紧邻台北凹陷桃东沟群主力生烃中心是其规模成藏的基础,古隆起为燕山早期油气聚集提供了良好构造背景,早期控制构造的深大断裂是油气纵向运移的主要通道,也是区带差异成藏的关键因素;二叠系梧桐沟组油藏主要受扇三角洲前缘相有利砂体展布控制,三叠系克拉玛依组油藏主要受断块等控制。The Permian-Triassic in Tuha Basin has great potential for oil and gas exploration and a large amount of remaining resources.However,the degree of exploration is low and only sporadic oil and gas breakthroughs have been made in Tuokexun Sag,Sanpu Sag and Taibei Sag.The current exploration activities mainly concentrate in Lukeqin structural zone in Kumu Bulge.The study shows that the Lukeqin large complex nose bulge zone has the richest Permian-Triassic oil reservoirs in Tuha Basin with complex tectono-stratigraphic framework and multiple types of oil reservoirs.The stratigraphic onlapping,reversion fold of fault depression,unconformity surface and faulted fan surrounding the paleo bulge are favorable conditions for the formation of multiple types of traps,which determine the hydrocarbon accumulation characteristics of complex oil and gas enrichment zone in Lukeqin large nose bulge zone.The source rocks of Taodonggou group in main hydrocarbon generation center of adjacent Taibei Sag are material basis for the large-scale hydrocarbon accumulation.The paleo uplift provides favorable tectonic settings for hydrocarbon accumulation in the Early Yanshanian period.The early deep and major faults controlling structures are the main channels for vertical hydrocarbon migration,which are also the key factors for differential hydrocarbon accumulation.The oil reservoir of Permian Wutonggou Formation is mainly controlled by the distribution of favorable sand bodies of fan delta front facies,while that of the Triassic Karamay Formation is mainly controlled by fault blocks.

关 键 词：吐哈盆地 鲁克沁构造带 二叠系—三叠系 复式油气聚集带 成藏特征 主控因素 

分 类 号：TE122.3[石油与天然气工程—油气勘探]