东营凹陷沙三中亚段浊积砂岩储层微观孔喉分布特征  

Distribution characteristics of micro pore throat size of turbidite sandstone reservoir in middle sub-member of 3rd member,Shahejie Formation in Dongying Depression

作　　者：王俊杰 吴胜和[1] 肖淑明[2] 郭芪恒 吕志强[4] 焦红岩[4] 郭志华[4] 刘中伟[4] 吴罕 肖晴[4] WANG Junjie;WU Shenghe;XIAO Shuming;GUO Qiheng;Lü Zhiqiang;JIAO Hongyan;GUO Zhihua;LIU Zhongwei;WU Han;XIAO Qing(College of Geosciences in China University of Petroleum(Beijing),Beijing 102249,China;Shengli Oilfield Branch,SINOPEC,Dongying 257000,China;Exploration and Development Research Institute of PetroChina Changqing Oilfield Company,Xi'an 710018,China;Xianhe Oil Production Plant,Shengli Oilfield Branch,SINOPEC,Dongying 257000,China)

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]中国石化胜利油田分公司,山东东营257000 [3]中国石油长庆油田分公司勘探开发研究院,陕西西安710018 [4]中国石化胜利油田分公司现河采油厂,山东东营257000

出　　处：《中国石油大学学报（自然科学版）》2021年第4期12-21,共10页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家科技重大专项(2017ZX05009001)。

摘　　要：以东营凹陷史深100地区沙河街组三段中亚段浊积砂岩储层为例,通过铸体薄片、扫描电镜、压汞试验对储层的微观孔隙结构进行研究,特别是通过高压压汞和恒速压汞相结合的手段表征浊积砂岩储层的孔喉尺寸分布特征。结果表明:研究区低渗浊积砂岩储层发育多种孔隙及喉道类型,主要孔隙类型为残余粒间孔、长石溶孔及各种微孔隙;喉道以片状喉道和管束状喉道为主,整体喉道较细,有许多不连通的孔隙被狭窄的喉道所包围,孔喉配置关系复杂;浊积砂岩储层的储集能力较强,但是渗流能力较弱;与常规砂岩储层相比,孔喉尺寸差异悬殊,全孔径分布范围介于几纳米~几百微米,曲线呈多峰型,主要发育巨孔(孔径大于10μm)和纳米孔(孔径小于0.1μm);决定低渗浊积砂岩储层物性的最关键因素是有效喉道的尺寸、数量以及孔隙与有效喉道之间的配置关系,有效喉道通过影响储层的渗流能力直接控制储层渗透率。Taking the turbidite sandstone reservoirs in the middle sub-member of 3rd member of Shahejie Formation in Shishen 100 area of Dongying Depression as an example,the microscopic pore structures of the reservoirs were studied by casting thin section,scanning electron microscope,and mercury injection experiment.Specifically the full pore throat size distribution characteristics of turbidite sandstone reservoirs were characterized by the combination of high-pressure mercury injection and constant pressure mercury injection.The results show that there are a variety of pores and throat types in the low-permeability turbidite sandstone reservoir in the study area.The main pore types are residual intergranular pores,feldspar dissolved pores and intercrystalline micropores.The throats are mainly sheet-like throat and tube-like throat,and the throats are relatively fine.There are many unconnected pores surrounded by narrow throats,and the pore-throat configuration is complex.The turbidite sandstone reservoirs have strong reservoir capacity,but weak seepage capacity.Compared with the conventional sandstone reservoir,the pore throat size is quite different.The full pore size distribution is between several nanometers and several hundred microns,and the curve is in multimodal shape.Large pores whose pore throat size is greater than 10μm,and nanopores whose pore throat size is less than 0.1μm are mainly developed.The key factors that determine the physical properties of low-permeability turbidite sandstone reservoirs are the size,quantity of effective throat and the configuration between pores and effective throats.Effective throat directly controls the reservoirs permeability by affecting the seepage capacity of reservoir.

关 键 词：东营凹陷 沙河街组 浊积砂岩储层 微观孔隙结构 全孔径分布 

分 类 号：P618.130.2[天文地球—矿床学]