渤海LD油田砂砾岩沉积特征及储层展布规律
Sedimentary characteristics and reservoir distribution of sandy conglomerate in Bohai LD Oilfield
刘洪洲 1黄琴 1李俊飞 1李振鹏 1张振杰1
作者信息
- 1. 中海石油(中国)有限公司天津分公司渤海石油研究院,天津,300452
- 折叠
摘要
渤海LD油田砂砾岩油藏开发方案实施后证实,南侧井区未成藏,北侧井区成藏,地质油藏模式发生较大变化.为探究其原因,利用岩心、薄片、钻测井、三维地震及开发动态等资料开展沉积储层研究,结果表明:沙二段为陡坡扇三角洲前缘沉积,物源供给受控于南北两侧沟谷,平面上发育两套沉积体;利用测井相识别出辫流坝、分支河道、河口坝、席状砂体等4 类微相砂体,其中,辫流坝和分支河道沉积水动力强、砾石含量高,孔隙、微裂缝发育,储层物性好,为优势储层相;优势储层受控于沉积水流方向和古地貌,北侧砂体的展布与油气充注方向匹配较好,油气充满度高,是油田调整挖潜的主要目标,而南侧砂体未成藏.
Abstract
After the development plan implementation of the sandy conglomerate reservoir in LD Oilfield of Bohai Sea,it's proved that the reservoir is not formed in the south but in the north,and the geological res-ervoir model has changed greatly.In order to find out the reasons,the sedimentary reservoir research is car-ried out by using core,thin section,drilling log,3D seismic data and dynamic data.The results show the second member of Shahejie Formation is a steep slope fan delta front sediment,with the source supply con-trolled by the valleys on both sides of the north and south,and two sets of sedimentary bodies developed on the plane.Four types of microfacies sand bodies,such as braided flow bar,branch channel,estuarine bar and sheet sand body are identified by logging facies,among which braided flow bar and branch channels have strong sedimentary water dynamics,high gravel content,developed pores and microcracks,and good reservoir properties,making them dominant reservoir facies,which is controlled by the direction of sedimen-tary flow and paleo-geomorphology.The distribution of sand body in the north is well matched with the di-rection of oil and gas charging,and the filling degree is high,which is the main target of oilfield adjustment and potential exploitation,while the sand body in the south has not formed reservoirs.
关键词
渤海油田/扇三角洲前缘/砂砾岩/沉积相/储层展布Key words
fan delta front deposit/sandy conglomerate reservoir/sedimentary facies/reservoir distribu-tion/Potential direction引用本文复制引用
基金项目
国家科技重大专项(2016ZX05058001)
出版年
2024
国家科技期刊平台
NSTL
万方数据