大牛地气田盒2、3段高孔渗储层的形成条件  

FORMATION CONDITIONS OF RESERVOIRS WITH HIGH POROSITY AND PERMEABILITY IN THE SECOND AND THE THIRD MEMBERS OF LOWER SHIHEZI FORMATION IN DANIUDI GAS FIELD

作　　者：贾会冲[1] 孟军田[1] 

机构地区：[1]中国石化华北分公司勘探开发研究院

出　　处：《天然气工业》2007年第12期43-45,共3页Natural Gas Industry

基　　金：中国石化科技研究开发项目"鄂尔多斯盆地北部天然气成藏规律及目标评价"的部分内容

摘　　要：大牛地气田二叠系下石盒子组盒2、3段发育岩性气藏,致密背景下"相对高孔隙度、高渗透率"储层的发育是气藏高产富集的主控因素。为此,通过对高、孔渗储层的岩石学特征、物性特征、孔隙结构、岩石微相、沉积微相及成岩后生作用的分析研究,阐述了其发育特征和形成条件。结果表明:组成高孔、渗储层的砂岩类型主要是粗粒的岩屑石英砂岩和石英砂岩,其较多地保存了原生粒间孔,具有较高的中值半径和平均喉道半径以及较低的排驱压力;高能环境下有利的沉积微相和成岩早期包壳状胶结物对原生粒间孔隙的保护作用是形成高孔、渗储层的基础条件。Lithologic gas reservoirs are well developed in the second and the third members of the Lower Shihezi Formation in Daniudi gas field, and the development of reservoirs with relatively high porosity and permeability in a tight sand background is the main factor controlling the enrichment and high productivity of the gas pools. The development characteristics and formation conditions of the reservoirs with high porosity and permeability are discussed based on analyses of their petrologic features, petrophysical properties, pore structures, micro lithofacies, sedimentary microfacies, and epidiagenesis. The results show that the sandstone reservoirs with high porosity and permeability are mainly composed of coarse-grained lithic quartz sandstone and quartz sandstone with relatively well-preserved primary intergranular pores, relatively large median radius and average pore throat radius, and relatively low displacement pressure. The protection of primary intergranular pores by the favorable sedimentary microfacies in a high energy environment and the coating cements formed at the early diagenetic stage provide the basic conditions for the development of reservoirs with high porosity and permeability.

关 键 词：大牛地气田 二叠纪 高渗透储集层 特征 成因 岩性 沉积相 胶结物 

分 类 号：P618.13[天文地球—矿床学]