通过分析鄂尔多斯盆地苏里格气田盒8段储层孔渗数据，开展孔隙度、渗透率分布的研究。致密砂岩储层孔渗分布宏观上不具有正态分布或对数正态分布特征，但按岩性分别统计，石英砂岩、岩屑石英砂岩和岩屑砂岩的孔隙度和渗透率均具有正态分布或对数正态分布特征。结合6种正态分布参数对不同岩性储层的表征结果表明：石英砂岩储层物性较好，岩屑石英砂岩储层物性次之，岩屑砂岩储层物性较差。岩屑砂岩表现出强非均质性，石英砂岩次之，岩屑石英砂岩非均质性相对较弱。在天然气开发中，石英砂岩储层应为首选目标。建立储层孔渗关系时，按岩性分别对孔渗数据的分布进行正态性检验，当孔渗数据的分布符合正态分布时，建立的孔渗关系才是有效的。%This paper analyzes a large number of porosity and permeability data from Member 8 reservoir of Shihezi Formation in the Sulige gas field and researches the distribution of porosity and permeability.On a macro scale,the porosity and permeability do not have normal or log-normal distribution characteristics in the tight sandstone reservoir,but have normal or log-normal distribution in the quartz sandstone,lithic quartz sandstone and lithic sandstone when lithology is distinguished. Combined with six kinds of normal distribution parameters for different lithological reservoir characteristics,the results show that the property of the quartz sandstone reservoir is good,that of the lithic quartz sandstone reservoir comes second and the heterogeneity of the lithic quartz sandstone is relatively weak.The property of the lithic sandstone reservoir is poor but has strong heterogeneity. The quartz sandstone reservoir should be the preferred target in the gas development.The test of normality is done before establishing the relationship between porosity and permeability. The relationship is valid when the distribution of porosity and permeability is normal distribution.
展开▼
