摘要
砾岩油藏由于储集层的强非均质性,在注水开发中后期剩余油分布复杂,总结水淹层特征和剩余油分布规律是砾岩油藏开发调整中的难点。以新疆油田六中东区克下组油藏为研究对象,利用岩心、测井资料在制定水淹层识别标准的基础上,分析了储集层水淹程度和水淹特征,将新疆油田六中东区砾岩油藏剩余油宏观分布模式分为以下4种:油水井注采不对应型、油层顶部型、界面遮挡型,以及透镜体型;微观上单模态储层水驱相对均衡,剩余油呈薄膜式、隔断式分布;双模态储层剩余油主要呈族群式分布在连通差的中小孔喉;多模态储层剩余油呈团块式分布在中细孔喉。系统总结了沉积相对剩余油分布的控制作用,扇中储集层为多期的辫状河分流水道与漫流细粒沉积互层,非均质性强,导致水驱油波及体积不高,剩余油主要为油层顶部型、界面遮挡型,剩余油富集,是挖潜的主要目标。
Conglomerate reservoirs have strong heterogeneity ,which would result in complicated remaining oil distribution in mid-late water injection development stage .To assess the flooding degree of water flooded layers and find out the remaining oil distribution law are important and difficult in oil field developing adjustment .The paper take Kexia formation reservoir of Liuzhongdong area in Xinjiang oil field for example ,and on base of establishing the criterion of identification of water flooded layers by using the core and logging data ,the reservoir flooding degree and features are analyzed ;then divided the macroscopic remaining oil distribution model of conglomerate reservoirs into 4 categories :injection-production not corresponding ,oil layers on top ,interface barrier type and lenticular type ;in microcosmic view ,the waterflooding of single rock type reservoir is relative balanced with the remaining oil distribution are diaphragm type and severed type ;the remaining oil distribution of two rock types reservoir is clustering in poor connected middle-micro pore throat ;the remaining oil distribution of multiply types of rock reservoir is cloddy in middle-thin pore throat ,Concluded the effect of sedimentary facies to remaining oil distribution ,the middle fan reservoir is the main target of tapping potential ,it interbed of multi-period braided river distributary channel deposition and sheetflood fine particle deposition ,which has strong heterogeneity and result in low swept volume of displacement of oil by water caused the remaining oil distribution model mostly are layers on top type and interface barrier type and remaining oil are enrichment .
出处
《中国矿业》
北大核心
2013年第S1期177-182,225,共7页
China Mining Magazine
基金
中国石油天然气集团公司科技开发项目资助(编号:2010B-1107)
关键词
砾岩油藏
冲积扇
剩余油
克下组
水淹特征
conglomerate reservoirs
alluvial fan
remaining oil
Kexia formation
characteristic of water flooding
