鄂尔多斯盆地长6油层组深水沉积特征与致密油藏分布  

Deep-water Deposition Characteristics and Tight Oil Distribution in Chang 6 Reservoir of Yanchang Formation in Ordos Basin

作　　者：程党性[1] 姚宜同 王克[1] 邓秀芹[1] 

机构地区：[1]中石油长庆油田分公司勘探开发研究院低渗透油气田勘探开发国家工程实验室,陕西西安710018 [2]长江大学地球资源与水环境学院,湖北武汉430100

出　　处：《石油天然气学报》2014年第10期16-21,3,共6页Journal of Oil and Gas Technology

基　　金：国家科技重大专项(2011ZX05044;2011ZX05001-004)

摘　　要：为了拓宽勘探领域,预测有利砂体及油藏展布,指导下一步勘探部署,在大量岩心、野外露头观察的基础上,结合铸体薄片、图像粒度等分析化验手段,对鄂尔多斯盆地长6油层组深水沉积类型及致密油藏分布进行了系统研究。结果表明:长6油层组岩心中发育大量的深水沉积构造,包括有粒序层理、底部印模构造以及准同生变形构造等,据此将其划分为深水三角洲前缘、砂质碎屑流、浊流以及滑塌重力流等多种深水沉积类型。其中,分布于东北部的深水三角洲前缘砂体以及湖盆中部的砂质碎屑流砂体是区内的主要储集砂体,而西部和深水沉积中心的滑塌、浊积砂体为次要储集砂体。致密油藏在区内东北部大面积复合连片,而在西南部则以相对孤立的形式发育。For the sake of broadening exploration field,forecasting the distribution of favorable sand body and oil reservoir,guiding the deployment of next oil exploration,a systematical research was carried on deep-water deposition types and tight reservoir distribution of Chang 6 Reservoir in Ordos Basin on the basis of a large number of cores and the outcrops,according to cast thin section,image granularity analysis method.The result indicates that there are a lot of deep-water sedimentary structure developed in the cores from Chang 6 Reservoir,including graded bedding,bottom moulage structure and penecontemporaneous deformation structure etc.in Ordos basin.Therefore it is divided into various deep-water sedimentary types,such as deep-water delta-front,sandy debris flow,turbidite current and the slide gravity flows etc.Among them,the sands of delta-front in northeast of Odors Basin and the sands of sandy debris flow in middle part of the lake basin are the important reservoir sands.the sliding and turbidite sands in the west and in the mid part of lake basin are the secondary reservoir sands.So the tight reservoirs are composite block in the northeast of the basin,while it is relatively isolated in the southwest in the basin.

关 键 词：鄂尔多斯盆地 长6油层组 深水沉积 砂质碎屑流 浊流 致密油藏 

分 类 号：P618.13[天文地球—矿床学]