砂体叠置结构及构型特征对水驱规律的影响——以哈萨克斯坦南图尔盖盆地Kumkol油田为例  

Influences of sandstone superimposed structure and architecture on waterflooding mechanisms:A case study of Kumkol Oilfield in the South Turgay Basin,Kazakhstan

作　　者：赵伦[1] 王进财[1] 陈礼[1] 陈希 范子菲[1] 张祥忠[1] 田中元[1] 

机构地区：[1]中国石油勘探开发研究院

出　　处：《石油勘探与开发》2014年第1期86-94,共9页Petroleum Exploration and Development

基　　金：国家科技重大专项'全球常规油气资源潜力分析与未来战略选区'(2011ZX05028-001);中国石油天然气集团公司重大专项(2011E-2506)

摘　　要：以哈萨克斯坦南图尔盖盆地Kumkol高含水油田为例,建立曲流河、辫状河、三角洲3种沉积砂体构型模式,研究不同类型砂体接触叠置关系及内部构型特征对水淹规律、水驱开发效果的影响。曲流河砂体内部以侧积层为主要构型特征,砂体间叠置关系简单,注入水主要沿砂体下部突进,造成底部优先水淹,中强水淹厚度比例占51.8%;辫状河砂体内部以近水平分布的落淤层发育为特征,砂体非均质程度低,纵向上水驱波及比较均匀,中强水淹比例高达81.7%;三角洲砂体叠置结构与构型特征相对比较复杂,不同砂体之间频繁叠置,砂体内部发育泥质夹层,注入水推进一方面受到砂体间的不渗透或者低渗透层遮挡,同时在砂体内部受泥质夹层的影响,水驱波及范围小,中强水淹仅占32.6%。数值模拟研究表明,辫状河砂体含水上升速度慢,无水采出程度高,水驱开发效果最好;三角洲砂体水驱波及差,含水上升快,无水采出程度低,水驱开发效果最差,潜力较大;曲流河砂体介于二者之间。Taking the Kumkol oilfield of high water cut in the South Turgay Basin, Kazakstan as an example, this article built the architecture models of meandering river sandstones, braided river sandstones and delta sandstones, and analyzed the influence of the superimposed structure characteristics between different types of sandstones and internal architecture features on warterflooding mechanisms and effects. The meandering river sandstones are mainly characterized by lateral accretion shale beddings inside, with simple overlay-relationship in sand bodies. In meandering river sandstones, injected water almost sweeps through the bottom of sand bodies and the bottom part of the sandstones is previously waterflooded, and the thickness ratio of strong and moderate waterflooded zone is about 51.8%. Braided river sandstones are characterized by nearly horizontal interlayers inside, with low heterogeneity and uniform waterflooding sweep vertically, and the thickness ratio of strong and moderate waterflooded zone is as high as 81.7%. The superimposed structure and architecture of delta sandstone is relatively complicated; different types of sandstones overlay each other frequently and shale interbeds are developed in sandstones. The injected water is obstructed not only by impermeable or low-permeable layers between sand bodies but also by shale interbeds in sandstones, with low sweep range of injected water, and the thickness ratio of strong and moderate waterflooded zone is only 32.6%. The braided river sandstone has low rising velocity of water cut and high no-water recovery degree, and its waterflooding development effect is the best. The waterflood sweep of delta sandstones is poor, with fast rising velocity of water cut and low no-water recovery degree, and its waterflooding development effect is the worst. The waterflooding development effect of meandering river sandstones is moderate among these three types of sandstones.

关 键 词：南图尔盖盆地 砂体类型 曲流河 辫状河 三角洲 水淹程度 水驱特征 剩余油 

分 类 号：TE341[石油与天然气工程—油气田开发工程]