辫状河储层内部建筑结构及剩余油分布研究  

Study on the Reservoir Architecture and Remaining Oil Distribution of Braided Channel

作　　者：李伟强 尹太举[2] 赵伦[1] 李峰[3] 陈梁 LI Weiqiang;YIN Taiju;ZHAO Lun;LI Feng;CHEN Liang(PetroChina Research Institute of Petroleum Exploration&Development,Haidian,Beijing 100083,China;College of Geoscience,Yangtze University,Wuhan,Hubei 430100,China;China National Oil and Gas Exploration and Development Co.,Ltd.,Xicheng,Beijing 100034,China)

机构地区：[1]中国石油勘探开发研究院,北京海淀100083 [2]长江大学地球科学学院,湖北武汉430100 [3]中国石油国际勘探开发有限公司,北京西城区100034

出　　处：《西南石油大学学报（自然科学版）》2018年第4期51-60,共10页Journal of Southwest Petroleum University(Science & Technology Edition)

基　　金：国家自然科学基金(41172106;41072087);国家科技重大专项(2011ZX05010-002-005)

摘　　要：储层内部建筑结构是影响开发效果的决定性因素,对剩余油分布具有控制作用。基于河流相建筑结构分析理论,在辫状河沉积模式指导下,采用层次分析法,从开发角度对砂体内部结构进行精细解剖,识别和确定出辫状河道、心滩坝、废弃河道和落淤层等结构要素,弄清各级次、各期次结构要素的接触关系,完成辫状河储层内部结构的精细表征;基于内部结构表征成果,结合不同时期水淹层测井解释结果和生产动态资料,恢复不同开发调整时期的水淹特征,动态表征辫状河储层内部结构控制下的水淹过程,并依据小井距密闭取芯井精细水洗结果验证,总结不同储层结构控制下的剩余油分布模式。结果表明,辫状河储层整体以高含水为主,水淹呈不均匀立体式、随机式特征,不具有分段水淹的特点,未水淹部位分布非常零散,局部物性变差部位、落淤层和低渗屏障遮挡部位直接控制了剩余油的分布。The reservoir architecture is the key factor influencing the outcome of oil and gas production,and controls the distribution of the remaining oil.Based on the theory of architectural-element of fluvial reservoir and the depositional model of braided rivers,this study performed hierarchical analysis and dissected the reservoir architecture elements of sandbodies in detail for the purpose of future production.Structural elements including braided channels,channel bars,abandoned channels,and mud drapes,were identified and confirmed.Contact modes among architectural elements of different levels and periods were recognized to complete the detailed characterization of the reservoir architecture of braided channel.Based on these results,and in conjunction with interpretation of water-flooded layers from logging data of different time periods and dynamic production performance,water-flooding characteristics at various production and adjustment stages were reconstructed.The water-flooding process controlled by reservoir architecture of braided channel was dynamically characterized.The distribution of the remaining oil controlled by the reservoir architecture is summarized and confirmed by the detailed water-flooding results of densely spaced sealed coring wells.The results show that the braided river reservoir has a generally high water content,with three-dimensional inhomogeneous and random water-flooding characteristics that do not occur in segmentations.The non-flooded regions are very scattered.Locations with local deterioration of reservoir physical properties,mud drapes,and low-permeability barrier occlusion directly control the distribution of the remaining oil.

关 键 词：辫状河 储层建筑结构 水淹特征 剩余油 大庆油田 

分 类 号：TE122[石油与天然气工程—油气勘探]