应用多尺度资料研究川西大邑构造上三叠统须家河组成岩储集相*

利用丰富的岩心、测井和地震资料，以薄片镜下观察、岩心物性分析、测井曲线交会、地震速度反演等作为手段，对大邑构造上三叠统须家河组储集层成岩储集相的类型、成岩储集相的地质与测井响应特征、以及优质成岩储集相的演化序列与平面分布开展了半定量—定量研究，以期深化低渗透砂岩储集层的地质理论和指导该地区气田的高效开发。结果表明，研究区砂岩可划分为4类成岩储集相，即强破裂杂基溶孔—微孔—裂缝成岩储集相、强压实微孔成岩储集相、强压实致密成岩储集相和强胶结致密成岩储集相。采用声波、密度、电阻率和自然伽马曲线交会的方法可有效识别各类成岩储集相。强破裂杂基溶孔—微孔—裂缝成岩储集相物性最好，为优质成岩储集相，其岩石类型以石英砂岩为主，经历了强烈的压实作用和破裂作用，孔隙度3％～8％，渗透率大于0.5×10^-3 μm²，主要发育在构造高部位的分流河道和水下分流河道砂体中，沉积因素和构造因素对其平面分布起到了重要控制作用。

Applying multi-scale data to study diagenetic reservoir facies of the Upper Triassic Xujiahe Formation in Dayi Structure, western Sichuan Province

By the full use of cores,well log and seismic data,the types of diagenetic reservoir facies, geological and logging response characteristics of diagenetic reservoir facies,and the diagenetic sequence and horizontal distribution of high-quality diagenetic reservoir facies of the Upper Triassic Xujiahe Formation in Dayi Structure are semiquantitatively-quantitatively researched through several methods,such as slice observation under microscope,core physical analysis,well curve intersection,seismic velocity inversion and so on.The aims of research are to deepen geological theories of low permeability sandstone reservoir and indicate effective development of gas field in this area.The results show that diagenetic reservoir facies of sandstone in the research area can be divided into 4 types,namely,the dissolution pore-micropore-fracture diagenetic reservoir facies with strong fracture,the micropore diagenetic reservoir facies with strong compaction,the tight diagenetic reservoir facies with strong compaction and the tight diagenetic reservoir facies with strong cementation.The curve cross plots of acoustic,density,resistivity and gamma are used to effectively identify different diagenetic reservoir facies.Among 4 types of diagenetic reservoir facies,the dissolution pore-micropore-fracture diagenetic reservoir facies are the high-quality diagenetic reservoir facies,whose porosity is between 3% and 8%,permeability larger than 05×10-3 μm2.The high-quality diagenetic reservoir facies mainly develops on distributary channels and subaqueous distributary channels of the high position of structure belt and belongs to quartz sandstone sufferring strong compaction and fracture.The distribution of them are controlled by sedimentary factors and structure factors.