湿地扇相储层流动单元评价及剩余油分布——以克拉玛依油田二中西八道湾组为例

Evaluation of flow units and distribution of remaining oil in humid fan reservoirs--a case study of west Badaowan formation,Erzhong area,Karamay Oilfield

针对克拉玛依油田二中西八道湾组湿地扇相砾岩储层岩性粗和非均质强等特点,综合各种地质、测井、化验分析及开发动态资料,优选出影响流体渗流的6项特征参数,将砾岩储层划分为E,G,M,P等4种流动单元类型。根据储层岩性、物性及微观孔隙结构特征,对储层流动单元进行了分类评价。通过流动单元与剩余油饱和度平面图叠合分析,总结了不同流动单元剩余油的分布特点。E类流动单元储集渗流能力最好,平面上呈条带状分布,注入水易形成高渗通道,采出程度高,剩余油饱和度低;G类流动单元储集渗流能力次之,分布面积大,为中等—弱水淹,剩余油相对富集,是下一步挖潜的主要目标。

Conglomerate reservoir of humid fan has the characteristics of coarse lithology and strong heterogeneity in west Badaowan formation,Erzhong area,Karamay Oilfield.Based on the geological,logging,core analysis and dynamic data,four types of flow units(E,G,M,and P) were identified according to six parameters that affected fluids flow.The characteristics of flow units were evaluated from reservoir lithology,physical property and micro pore structure.Finally,the 3D model of flow units was established by means of sequence indicator modeling.According to the analysis of superposition of plane map between flow units and remaining oil saturation,the remaining oil distribution of different flow unit was known.Flow unit E has the best capability of storage,it distributed as banded shape laterally with high recovery percent of reserve and low remaining oil saturation,and it is easy to form high-permeability channel for injected water.While flow unit G is rich in remaining oil with wide distribution for its lower capability of fluid flow and moderate to low water flooding,hence the main target for further development.