摘要
埕岛油田是中国石化胜利油田分公司海上重要的增储阵地,埕岛东坡东营组勘探潜力大、勘探程度相对较低。该区砂体类型多样、分布难以预测、成藏富集差异大。为了明确该区砂体成因及油气富集主控因素,基于录井、测井、测试、地震等资料分析,对埕岛东坡东营组的沉积特征、成藏控制因素进行系统研究。研究结果表明:①埕岛东坡主力含油层系Ed4砂组主要发育洪水湖底扇和滑塌湖底扇沉积类型。②受古地貌和断裂坡折带控制,扇体主要沿北东向展布的多个继承性沟谷分布;多期发育的砂体互相叠置,沟谷间储层相对独立,坡折处多为砂体尖灭带。③构造因素与沉积体系配置决定了研究区主要发育构造—岩性油藏、岩性油藏,其中坡折带下方至洼陷带发育较大规模自生自储的岩性油藏。④深水环境下多期重力流砂体叠置发育,形成规模性储层,奠定了该区油气富集的基础。源储配置、断裂及超压决定了该区油藏具有叠合连片分布、普遍富集高产的特点。
Chengdao oilfi eld is an important offshore area for reserve increase of Sinopec Shengli Oilfi eld Company.The Dongying Formation in the east slope of Chengdao area is of great potential with relatively low exploration degree.As the sand body types are diverse in this area,it is diffi cult to predict the distribution of sand bodies,and the hydrocarbon accumulation and enrichment patterns are of great differences.In order to fi gure out the genesis of sand bodies and the main controlling factors of oil and gas accumulation in this area,based on the analysis of mud logging,wireline logging,well test and seismic data,the sedimentary characteristics and control factors of hydrocarbon accumulation of the Dongying Formation in the east slope of Chengdao area are systematically studied.The results show that:(1)Types of sedimentary facies are mainly fl ood sub-lacustrine fans and slump sub-lacustrine fans of Ed4 sand group of the major oil-bearing series in the east slope of Chengdao area.(2)Controlled by paleo-geomorphology and fault slope break belt,the fan bodies are mainly distributed in NE direction along several inherited gullies.The sand bodies of multi-stages are overlapped with each other.Between the gullies,sand reservoirs are relatively isolated.The slope breaks are mostly the sand pinch-out zones.(3)Good confi guration relationship between structural factors and sedimentary system determines that there are mainly structural-lithologic and lithologic oil reservoirs in the study area.In the lower part of slope breaks to the sag areas,large-scale lithologic oil reservoirs of self-generation and self-accumulation are developed.(4)In deep water environment,multistage gravity-fl ow sand bodies are superimposed to form large-scale reservoir,which lays the foundation for oil and gas enrichment in this area.Source and reservoir assemblage,faults and overpressure determine that the oil reservoirs in this area have the characteristics of superimposed and contiguous distribution,general enrichment,and high production.
作者
宋明水
Song Mingshui(Sinopec Shengli Oilfi eld Company)
出处
《中国石油勘探》
CAS
CSCD
北大核心
2020年第4期31-42,共12页
China Petroleum Exploration
基金
国家科技重大专项“渤海湾盆地精细勘探关键技术”(2016ZX05006)
中国石油化工股份有限公司科技项目“成熟探区勘探层单元研究——以东营凹陷为例”(P18060-1)。
关键词
渤海海域
埕岛东坡
东营组
坡折带
湖底扇
重力流
岩性油藏
Bohai Sea
east slope of Chengdao area
Dongying Formation
slope break belt
sub-lacustrine fan
gravity fl ow
lithologic oil reservoir
