鄂尔多斯盆地镇泾地区长8致密砂岩储层孔喉组合分类及其意义  

Classification and Significance of Pore Throat Combination of Chang 8 Tight Sandstone Reservoir in Zhenjing Area,Ordos Basin

作　　者：夏东领[1] 邹敏[1] 庞雯[1] 吴胜和[2] Xia Dongling;Zou Min;Pang Wen;Wu Shenghe(Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China;3.College of Geosciences,China University of Petroleum（Beijing）,Beijing 102249,China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石油大学(北京)地球科学学院,北京102249

出　　处：《地质科技情报》2018年第4期120-126,共7页Geological Science and Technology Information

基　　金：国家科技重大专项"鄂南长7页岩油地质综合评价及目标优选"(2017ZX05049006-002);中石化科技部项目"鄂南致密储层精细表征技术研究"(P17005-1)

摘　　要：陆相致密砂岩储层作为一种非常规储集体,具有复杂的孔喉组合类型,研究其微观孔隙结构对于认识致密砂岩储层特征具有重要的意义。在充分调研国内外致密储层微观孔隙结构分类方法的基础上,应用铸体薄片、场发射扫描电镜、压汞分析等资料,对镇泾地区长8致密砂岩储层的孔隙结构类型进行了分类研究。研究表明,镇泾地区长8致密砂岩储层发育多种孔隙类型,主要包括原生残余粒间孔、溶蚀扩大粒间孔、溶蚀粒内孔和以高岭石晶间孔为主的微孔隙群。喉道类型以弯片状为主,结合喉道大小与可动流体饱和度的相关性分析,进一步将喉道分为宽片状、窄片状和极窄片状。建立了以粒间孔-弯片状喉道、粒内孔-弯片状喉道以及微孔隙群-弯片状喉道为基础的3种基本孔喉组合类型,并进一步以喉道大小为基础,划分出7种孔喉组合类型。不同的孔喉组合类型形成于不同的沉积成岩背景,具有不同的物性特征、压汞参数特征,为致密砂岩储层分类提供了坚实的地质基础。As a kind of unconventional reservoir,continental tight sandstone reservoir has complex pore throat combination types.Hence,it is meaningful to study the micro pore structure to understand the characteristics of tight sandstone reservoir.On the basis of sufficient investigations of tight reservoir microscopic pore structure classification method,the pore structures of Chang 8 tight sandstone reservoir in southern Ordos Basin is classified,by casting thin sections,scanning electron microscopy,and mercury injection data.The study shows that Chang 8 reservoir develops a variety of pore types,mainly including primary residual intergranular pores,dissolution enlarged intergranular pores,intragranular pores of dissolution grains and micropores formed mainly by kaolinite.The throat type is mainly composed of curved sheet,and the throat size is divided into wide sheet,narrow slice and ultra-narrow slice according to the correlation between the throat size and the percentage of movable fluid.Three basic types of pore throat combination are identified：the intergranular pore-curved lamellar throat,intragranular pore throat and curved lamellar micropore group-curved lamellar throat.Futhermore,it can be divided into 7 kinds of pore throat combination type according to the throat size.Different pore throat combination types are formed in different sedimentary diagenetic background,with different physical characteristics and mercury intrusion parameter characteristics,which provides a solid geological basis for the classification of tight sandstone reservoirs.

关 键 词：孔喉组合 分类 致密砂岩 长8储层 镇泾地区 鄂尔多斯盆地 

分 类 号：P618.130.21[天文地球—矿床学]