滨里海盆地东缘盐下油气成藏特征与主控因素  

Characteristics and main controlling factors of sub-salt oil and gas accumulation in the eastern margin of the Precaspian Basin

作　　者：梁爽[1] 吴亚东 王燕琨[1] 王震[1] 盛善波 Liang Shuang;Wu Yadong;Wang Yankun;Wang Zhen;Sheng Shanbo(PetroChina Research Institute of Petroleum Exploration&Development;China National Oil and Gas Exploration and Development Corporation Ltd.;CNPC International Aktobe Company)

机构地区：[1]中国石油勘探开发研究院,100083 [2]中国石油国际勘探开发有限公司 [3]中油国际阿克纠宾公司

出　　处：《中国石油勘探》2020年第4期125-132,共8页China Petroleum Exploration

基　　金：国家科技重大专项“全球油气资源评价与选区选带研究”(2016ZX05029);中国石油天然气集团有限公司科技管理部项目“海外重点战略大区勘探技术与应用”(2019D-4307)。

摘　　要：滨里海盆地盐下油气资源十分丰富,是世界重要的油气产地。盆地东缘受古隆起和乌拉尔造山运动双重影响,油气成藏控制因素复杂。通过分析油气成藏要素特点和成藏模式,提出油气成藏主控因素。盆地东缘油气成藏与乌拉尔洋俯冲—消减—关闭的过程密切相关,这一过程产生的古裂谷、古隆起控制了油气藏的形成。古裂谷控制生烃中心,裂谷作用产生的断裂成为油气运移主通道;古隆起控制早期碳酸盐台地形成及其上优质储层发育,同时也是油气聚集的重要指向区;乌拉尔造山运动控制后期碳酸盐台地形成,乌拉尔造山带及其他海西期造山带使盆地演化为封闭海环境,形成全盆地分布的空谷阶盐岩优质盖层,碰撞造山过程产生的断裂形成断层相关圈闭、改善储层性能及导致油气二次成藏。The Precaspian Basin is rich in sub-salt petroleum resources,which is an important oil and gas producing area in the world.As the eastern margin of the basin is affected by paleo-uplift and Ural orogeny,the controlling factors of hydrocarbon accumulation are complex.Based on the analysis of the characteristics of hydrocarbon accumulation factors and accumulation models,the main controlling factors of oil and gas accumulation are put forward.The hydrocarbon accumulation in the eastern margin of the basin is closely related to the process of subduction,subtraction and closure of the Ural ocean,which formed paleo-rifts and paleo-uplifts that controlled the formation of oil and gas reservoirs.Paleo-rifts controlled hydrocarbon generation centers.The faults formed by rifting became the main pathways of oil and gas migration.Paleo-uplifts controlled the formation of early carbonate platform and the development of the overlying high-quality reservoirs,which are also the important directional areas for oil and gas accumulation.The Ural orogeny controlled the formation of later carbonate platform.The Ural orogenic belt and other Hercynian orogenic belts made the basin evolve into a restricted marine environment,forming the high-quality salt caprocks of Kungurian stage distributed in the whole basin.The faults generated during the collision orogeny formed the fault-related traps,improved the reservoir performance,and led to the secondary hydrocarbon accumulation.

关 键 词：滨里海盆地 东缘 乌拉尔 盐下 控制因素 油气成藏 

分 类 号：TE112.3[石油与天然气工程—油气勘探]