摘要
焉耆盆地北部凹陷宝浪苏木构造带—四十里城斜坡带侏罗系八道湾组源岩层系油气勘探前景广阔,但对构造背景和在大面积斜坡背景下的圈闭发育模式认识不清。通过恢复焉耆盆地北部凹陷八道湾组沉积前古地貌,利用井震结合建立了古地貌控制下层序地层格架,并在格架约束下开展了沉积体系展布和刻画,明确了圈闭发育模式及有利勘探区带。结果表明:八道湾组沉积前发育了多级构造坡折带,控制了八道湾组地层展布及沉积样式,坡折带之下发育低位体系域厚层三角洲前缘砂体,之上发育湖侵和高位体系域富泥沉积体系;古地貌坡折控制下八道湾组共发育2种类型的隐蔽圈闭,古隆起与湖平面耦合控制下,低位砂体配置上覆湖侵泥岩可形成地层-岩性圈闭。坡折带控制下发育的浊积砂岩可形成透镜体圈闭,四十里城斜坡区发育厚层优质烃源岩,生烃潜力巨大;坡折带控制的2类圈闭群具有源储紧邻、高效充注、保存条件优越的特征,是下一步有利勘探目标。研究成果为焉耆盆地及周边盆地八道湾组的勘探部署提供指导。
Source rock series of Jurassic Badaowan Formation in Baolangsumu structural belt-Sishilicheng slope belt in northern sag in Yanqi Basin Basin have broad oil and gas exploration prospects,but lacks of structural back⁃ground,with less understanding on traps development patterns in the background of large-scale slopes.By restoring pre-sedimentary paleogeomorphology of Badaowan Formation in northern sag of Yanqi Basin,sequence stratigraph⁃ic framework controlled by paleogeomorphology is established via well-seismic tie,and sedimentary systems exten⁃sion is characterized with constraints of the framework,clarifying traps development patterns and favorable explora⁃tion plays.The results show that multi-level structural slope breaks developed before the sedimentation of Badaowan Formation,controlling stratigraphic extension and sedimentary style of Badaowan Formation.Thick delta-front sand⁃bodies of low-stand systems tract developed below slope breaks,while lake transgression and high-stand systems tract mud-rich sedimentary systems developed above them.2 types of subtle traps developed in Badaowan Formation controlled by paleogeomorphic slope breaks.With coupling control of paleo-uplift and lake level,the configura⁃tion of low-stand systems tract sandbodies and overlying lacustrine mudstone form stratigraphic-lithologic traps.Tur⁃bidite sandstone developed with control of slope breaks form lens traps.Thick high-quality source rock developed in Sishilicheng slope area with huge hydrocarbon generation potential.2 types of trap groups controlled by slope breaks are characterized by adjacent source and reservoir,high-efficient charge,and superior preservation conditions,be⁃ing next favorable exploration target.The research provides guidance for exploration deployment of Badaowan For⁃mation in Yanqi Basin and surrounding basins.
作者
张仲培
齐育楷
王瀚洲
金芸芸
黄帅博
常文鑫
ZHANG Zhongpei;QI Yukai;WANG Hanzhou;JIN Yunyun;HUANG Shuaibo;CHANG Wenxin(Sinopec Petroleum Exploration and Production Research Institute,Bejing 100083,China;Exploration&Development Research Institute of Sinopec Henan Oilfield Company,Nanyang 473132,China)
出处
《大庆石油地质与开发》
CAS
北大核心
2023年第5期9-17,共9页
Petroleum Geology & Oilfield Development in Daqing
