低渗透致密气藏水锁空间及伤害程度影响因素探析:以苏里格气田苏48区块盒8段储层为例  

Diagenesis of Low-Permeability and Tight Sandstone Gas Reservoir and Its Effect on Reservoir Quality:An Example of the Eight Member of Shihezi Formation in Su 48 Block,Sulige Gasfield

作　　者：庞振宇[1,2] 孙卫[1,2] 雒婉莹 马二平[1,2] 高航[1,2] 

机构地区：[1]西北大学大陆动力学国家重点实验室,西安710069 [2]西北大学地质学系,西安710069

出　　处：《地质科技情报》2014年第3期140-144,共5页Geological Science and Technology Information

基　　金：国家科技支撑计划项目(2007BAB17B02);国家科技重大专项(2011ZX05044);陕西省科技统筹创新工程重大科技项目(2011KTZB01-04)

摘　　要：低渗透致密气藏具有压实作用强烈、黏土矿物含量高、孔喉半径小、孔喉配置关系差、毛细管压力高、压敏效应强、非均质性严重、油气流动阻力大等特点，导致其具有特殊的气水分布形式。利用铸体薄片、扫描电镜、恒速压汞、核磁共振、气水相渗等实验分析资料，分析了苏里格气田苏48区块盒8段低渗透储层的水锁空间及伤害程度。研究表明，研究区的水锁空间为0．003～0．04μm的孔喉空间，水锁伤害率为61．5％，水锁伤害程度受储层物性、微观孔隙结构、可动流体饱和度、填隙物含量、黏土矿物含量以及微裂缝发育程度等因素的综合影响，其表现形式多样。Low permeability tight gas reservoirs are characterized with properties such as strong compaction, high clay mineral content, small pore throat radius, poor pore throat distribution relationships, high capillary pressure, strong pressure sensitive effect, serious heterogeneity and large oil and gas flow resistance, all of which result in particular gas-water distribution. Using experimental data obtained from cast thin section, scanning electron mi croscopopy, the constant speed mercury, nuclear magnetic resonance and gas-water relative permeability studies, the reservoir damage and water locked space of He 8 formation in Su 48 block of Sulige gas are analyzed. It is concluded that the pore throat radius caused by water＇s blocking in the study area is about 0. 003-0. 04 μm, the water damage rate of which is about 61.5%. Moreover, factors influencing the water block damage are from many aspects as follows, the reservoir property, micro pore structure, the movable fluid saturation, the content of clay and matrix and micro fracture, all of which are variable.

关 键 词：低渗透储层 微观孔隙结构 恒速压汞 水锁空间 水锁伤害率 

分 类 号：P618.130.2[天文地球—矿床学]