摘要
从不同角度解析西柳10断块低渗透储层微观孔隙结构特征,可以为该地区沙二段储层综合评价提供理论依据。应用扫描电镜、铸体薄片、常规压汞、恒速压汞、核磁共振、真实砂岩模型等测试手段探讨了低渗透储层微观孔隙结构参数对可动流体饱和度、驱油效率的影响。研究表明:西柳地区沙二段储层微观孔隙结构与成岩作用密切相关,主要表现粒间孔及溶孔越发育,有效孔喉连通性越强,其进汞饱和度越高。依据排驱压力将储层划分为3类,排驱压力小于0.1 MPa时,储层为Ⅰ类,可动流体饱和度平均为66.1%,驱替类型以网状为主;排驱压力介于0.1～0.5MPa时,储层为Ⅱ类,可动流体饱和度平均为57.9%,驱替类型以指状-网状为主;排驱压力大于0.5MPa时,储层为Ⅲ类,可动流体饱和度平均为46.2%,驱替类型以指状为主。当渗透率小于2×10^(-3) μm^2,喉道半径小于2.3 μm时,可动流体饱和度、驱油效率受两者影响明显。喉道半径是影响储层开发效果的主控因素。
The analysis of pore structure characteristics of low permeability reservoirs in Fault Block 10 from different perspectives provides the basis for Es2 reservoir comprehensive evaluation in the area.This paper studies the effects of oil displacement efficiency by scanning electron microscopy（SEM）,the thin sections,conventional mercury penetration,constant speed mercury penetration,and the test means such as nuclear magnetic resonance（NMR）,and real sandstone model to discuss low permeability reservoir microscopic pore structure parameters on the movable fluid saturation.The study shows that the microscopic pore structure and diagenesis are closely related to Es2 low permeability reservoir of Xiliu area,illustrated by the well development of intergranular pores and dissolution pores and that the stronger the effective pore connectivity is,the higher the mercury injection saturation.The reservoir can be divided into three categories according to the row of displacement pressure.When the displacement pressure is less than 0.1 MPa,Class Ⅰ reservoir fluid saturation is averaged at 66.1%,and finally displacement type is given priority to mesh.When the row of displacement pressure is between 0.1-0.5 MPa,Class Ⅱ reservoir fluid saturation reaches an average of 57.9%,and finally displacement type is mainly finger-mesh.When the row of displacement pressure is greater than 0.5 MPa,Class Ⅲ reservoir fluid saturation gives an average of 46.2%,and finally displacement type is finger.When the permeability is less than 2×10!（-3） μm^2,and throat radius is less than 2.3 μm,movable fluid saturation,oil displacement efficiency is affected obviously.Throat radius is the main controlling factor of development effect in this area.
作者
杜玉洪
郭发军
陈洪
王红梅
郭睿
杨会鹏
张浩
朱玉双
Du Yuhong;Guo Fajun;Yang Huipeng;Chen Hong;Wang Hongmei;Guo Zhang Hao;Zhu Yushuang(Research Institute of Exploration and Development of Huabei Oilfield Company,Renqiu Hebei 062552,China;a.State Key Laboratory of Continental Dynamics;2.Department of Geology,Northwest University,Xi＇an 710069,Chin;3.Xi＇an Shiyou University,Xi＇an 710061,China)
出处
《地质科技情报》
CSCD
北大核心
2018年第5期63-69,共7页
Geological Science and Technology Information
基金
中国石油天然气股份有限公司重大专项"华北油田持续有效稳产勘探开发关键技术研究与应用"(2017E-15)
关键词
低渗透储层
微观孔隙结构
恒速压汞
Es2储层
西柳地区
low permeability reservoir
microscopic pore structure
constant speed mercury injection
Es2 reservoir
Xiliu area
