塔北隆起英买力地区白垩系油气成藏规律——以英买46井区为例  

Cretaceous hydrocarbon accumulation rules of the Yingmaili area in the Tabei uplift:A case study of the Yingmai 46 well block

作　　者：赵海涛[1] 孙琦[1] 李文浩[2,3] 高登宽 赵风云 卢双舫[2,3] 朱鹏飞[2,3] ZHAO Haitao;SUN Qi;LI Wenhao;GAO Dengkuan;ZHAO Fengyun;LU Shuangfang;ZHU Pengfei(Research Institute of Exploration and Development,PetroChina Tarim Oilfield Branch Company,Korla,Xinjiang 841000,China;Key Laboratory of Deep Oil and Gas,China University of Petroleum,Qingdao,Shandong 266580,China;School of Geosciences,China University of Petroleum,Qingdao,Shandong 266580,China)

机构地区：[1]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [2]中国石油大学(华东)深层油气重点实验室,山东青岛266580 [3]中国石油大学(华东)地球科学与技术学院,山东青岛266580

出　　处：《中国矿业大学学报》2022年第1期137-147,共11页Journal of China University of Mining & Technology

基　　金：国家科技重大专项(2016ZX05004-004);中国石油天然气股份有限公司塔里木油田分公司科技项目(041019100036)。

摘　　要：针对英买46井区油气平面分布不符合差异聚集原理的现象,依据油源对比、流体包裹体方法,结合沉积学及成藏因素综合评价方法,系统地研究了英买46井区的油气来源及成藏过程,揭示了油源、成藏期次、运移路径的差异共同制约了平面上"西油东气"特征.研究结果表明:研究区油气分别来自于库车坳陷三叠系黄山街组烃源岩和侏罗系恰克马克组烃源岩,两套烃源岩TOC平均值均接近1%,生烃潜力较好;研究区巴西改组底部砂岩为主要储层,孔隙度为19.1%,其顶部泥岩盖层评价指数为2.5,封盖能力较好,储层和盖层并不是油气差异聚集的主控因素.英买46井区存在2期油气充注过程——第1期油气充注约为5 Ma;第2期约3.5 Ma.第1期充注时,三叠系黄山街组烃源岩生成的原油经过白垩系底不整合面运移至英买力地区,经断裂调整至巴西改组砂体后进行侧向运移,在英买46井区的薄砂层和块状砂岩内聚集成藏;第2期充注时,侏罗系恰克马克组烃源岩生成的天然气经白垩系底不整合长距离运移至英买46井区后,经该区主断层调整进入巴西改组块状砂岩,同早期形成的油藏混合后于英买46井区东部形成凝析气藏.Aiming at the phenomenon that the horizontal distribution of oil and gas in the Yingmai 46 well area does not conform to the principle of differential accumulation,combined with the comprehensive evaluation of sedimentology and accumulation factors,the origin and accumulation process of oil and gas in the study area have been systematically investigated based on oil source correlation and fluid inclusion.It is revealed that the differences in oil source,accumulation period and migration path jointly restrict the characteristics of"western oil and eastern gas"in the horizontal distribution.The results show that the oil and gas in the study area mainly come from the source rocks in the Triassic Huangshanjie formation and Jurassic Qiakemake formation,respectively,in the Kuqa depression.The average TOC values of the two sets of source rocks are both close to 1%,showing good hydrocarbon potential.The sandstone at the bottom of the Baxigai formation is the main reservoir in the study area,with a porosity of 19.1%,and its top mudstone can be the cap rocks with the evaluation result of 2.5.Reservoirs and caprocks are not the main controlling factors for differential accumulation of oil and gas.There are two stages of hydrocarbon accumulation in the Yingmai 46 well block.The first stage of hydrocarbon accumulation is about 5 Ma.The oil and gas generated from the Triassic Huangshanjie formation source rocks migrated to the Yingmaili area through the unconformity at the bottom of the Cretaceous,then migrated laterally in the Baxigai formation by the faults,and finally accumulated in the thin sand layers and massive sand in the Yingmai 46 well area.The second stage of hydrocarbon accumulation is about 3.5 Ma.The gas generated from the Jurassic Qiakemake formation source rocks migrated to the Yingmai 46 well area over a long distance through the unconformity at the bottom of the Cretaceous,and then entered the Baxigai formation massive sands to be mixed with oil formed in the early stage because of the adjustment of the main

关 键 词：油气成藏规律 油气运移 不整合面 英买力地区 塔北隆起 

分 类 号：P618[天文地球—矿床学]