川中安岳地区须二段致密砂岩储层孔隙结构特征及测井识别  

Pore structure characteristics and logging recognition of tight sandstone reservoir of the second member of Xujiahe Formation in Anyue Area, central Sichuan

作　　者：柴毓[1,2] 王贵文[1,3] 张晓涛[1] 冉冶[1] 

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]石油工业出版社有限公司,北京100011 [3]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249

出　　处：《中南大学学报（自然科学版）》2016年第3期819-828,共10页Journal of Central South University:Science and Technology

基　　金：国家科技重大专项(2011ZX05020-008);中石油创新基金资助项目(2013D-5006-030)~~

摘　　要：通过对岩心、铸体薄片、扫描电镜和压汞实验等资料分析,对四川安岳地区须二段致密砂岩储层岩石学、物性、孔隙结构特征及分类标准等进行研究。分析不同孔隙结构类型的常规测井曲线响应特征,建立测井定量识别标准,进而划分安岳地区各单井孔隙结构类型。研究结果表明:储层主要发育粒间、粒内溶孔、杂基孔、晶间微孔和微裂缝等,孔隙结构具有小孔隙、微喉道、细歪度、分选差、孔喉非均质性强和连通性较差的特征。根据铸体薄片、岩心物性分析、毛细管压力曲线及孔喉半径的组合关系,将须二段储层孔隙结构划分为4类,即Ⅰ类大孔粗喉型、Ⅱ类中孔中喉型、Ⅲ类中孔细喉型和Ⅳ类小孔微喉型,不同孔隙结构类型的储层具有不同的物性特征。Ⅰ类储层含气性和渗流能力最好,常与构造裂缝伴生,Ⅱ类物性和含气性较好,Ⅲ类和Ⅳ类通常储集性能较差,对应差储层或无效储层。Petrologic characteristics, physical property, pore structure characteristics and classification standard of Xu-2（the Second Member of Xujiahe Formation） Reservoir were studied by analyzing core, casting thin section, scanning electron microscope and mercury injection data. The logging response characteristics of different pore structure types were analyzed and summarised to build logging recognition criteria and then to identify pore structure types of each well in Anyue Area. The results show that the reservoir mainly develop intergranular, intragranular dissolved pore, matrix pore, intercrystalline pore and microfracture. Pore structure types are fine pores and throats, thin skewness of throat, poorly sorted, strong heterogeneity and poor connectivity of pore throats. Based on casting thin sections, physical property of cores, capillary pressure curves and combination of pores and throats, pore structures are divided into four types, including TypeⅠ large pore coarse throat structure, Type Ⅱ intermediate pore medium throat structure, Type Ⅲintermediate pore fine throat structure and Type Ⅳ fine pore fine throat structure. Different pore structures have different physical properties. Type Ⅰ has favorable gas potential and good percolation capacity, normally developed with structural fractures. Type Ⅱ is most likely to correspond to relatively good physical property and high gas content. Type Ⅲ and Ⅳ have poor storage capability, corresponding to bad reservoir or ineffective reservoir.

关 键 词：致密砂岩气 孔隙结构 测井识别 须二段 安岳地区 

分 类 号：TE122.2[石油与天然气工程—油气勘探]