摘要
孔隙结构研究是气藏精细描述、储层综合评价的重要内容,文章采用铸体薄片、扫描电镜、铸体图像分析、高压压汞和恒速压汞等多种技术手段,对苏里格气田的盒8 段储层的微观孔隙结构进行了深入的分析和研究。苏里格气田盒8段储层储集空间主要有粒间孔+微孔+溶孔型、溶孔+微孔+粒间孔型、溶孔+微孔型、微孔型等四种组合形式,溶孔+微孔+粒间孔型、溶孔+微孔型两种类型最为常见;孔喉半径峰值分布在0.04~2.34μm的范围内,连续相饱和度介于12.36%~36.77%,孔喉连通性较差。总体上看,盒8气藏主渗流喉道半径偏小,气体启动压差较大,气井一般需要进行改造方可获得较高产能;孔隙结构具有“大孔隙、小喉道、微裂缝不发育、孔喉连通性差”的特点,这种孔隙结构在开发过程中具有潜在的水锁伤害。
The pore structure study in an important content of fine gas reservoir description and comprehensive reservoir evaluation. The microscopic pore structure of P1-2 sh8(the eighth member of Shihezi Formation, Permian) reservoir in Sulige gas field was thoroughly analyzed and investigated by use of many technical means as cast thin section, scanning electron microscope, cast image analysis, high-pressure mercury injection and constant velocity mercury injection, etc. The reservoir rooms of P1-2 sh8 in the field mainly include four types, i. e. intergranular pore-micropore-solution pore type, solution pore-micropore-intergranular pore type, solution pore-micropore type and micro poretype, in which the solution pore-micropore-intergranular pore type and solution pore-micropore type were met with most commonly; the peak values of pore-throat radii range from 0.04 μm to 2.34 μm and the continuous phase saturation from 12.36% to 36.77%; and the pore-throat connectivity is rela-lively poor. On the whole, the main seepage pore-throat radii of P1-2 sh8 reservoir were on the small side and the starting pressure difference of gas was relatively great, therefore it was necessary for getting high productivity gas well to carry out stimulation; and the pore structure is characterized by large pores, small throats, undeveloped microfissures and poor porethroat connectivity and such a pore structure will cause the potential water locking damage in, the process of gas reservoir development.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2005年第4期50-52,共3页
Natural Gas Industry
关键词
苏里格气田
储层
孔隙结构
早二叠世
空间结构
高岭石
毛细管压力曲线
Image analysis
Mechanical permeability
Microporosity
Oil well production
Oil wells
Pore size
Pressure effects
Scanning electron microscopy
