Well logging assessment of tight sandstone gas reservoirs from the He-1 member of the Permian Lower Shihezi Formation in the Hangjinqi exploration area, Ordos Basin
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摘要: 通过储层"四性"关系研究,分析了鄂尔多斯盆地北部杭锦旗探区致密砂岩储层岩性对物性的控制作用及测井曲线对储层岩性、物性和含气性的响应特征。认为二叠系下石盒子组盒1段砂岩石英含量、粒度和孔隙结构是影响物性和含气性的主要因素,储层"四性"关系具有砂岩粒度与石英含量控制物性、物性控制含气性的基本特点。利用交汇图版法与双孔隙度曲线叠合法对研究区二叠系下石盒子组盒1段气层进行了综合识别。根据储层的岩性、物性、孔隙结构等参数,结合单井测试产能特征,将杭锦旗探区二叠系下石盒子组盒1段气层划分为3类进行综合评价,气层以Ⅱ类为主,其次为Ⅰ类。Abstract: The present paper gives a detailed description of the controls of lithology on physical properties and the responses of well logs to lithology, physical and electrical properties, and gas potential of the tight sandstone gas reservoirs from the He-1 member of the Permian Lower Shihezi Formation in the Hangjinqi exploration area, northern Ordos Basin. The main factors influencing physical properties and gas potential include quartz contents, grain sizes and pore structures in the sandstones from the study area. The recognition of the tight sandstone gas reservoirs in the He-1 member is based on the cross plot and porosity overlay tachniques, and the assessment of the tight sandstone gas reservoirs in the He-1 member is carried out according to three types of the gas reservoirs, of which the type Ⅱ gas reservoirs are interpreted to be the good gas reservoirs with exploration potential in the He-1 member.
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