因子分析法在致密砂岩储层成岩相划分中的应用

定量化评价是储层成岩相研究的重点和难点,为此通过铸体薄片、普通薄片镜下观察和对阴极发光、扫描电镜、岩芯照片等资料进行系统分析,详细研究了川北地区须家河组致密砂岩储层成岩相特征,并尝试根据因子分析法建立研究区致密砂岩储层不同类型成岩相的定量评价标准。结果表明:1川北地区须家河组成岩相可划分为建设性成岩相和破坏性成岩相两大类,其中建设性成岩相包括泥质包裹溶蚀相和易溶组分溶蚀相;破坏性成岩相包括强压实相(致密砂岩强压实相、泥岩强压实相)和钙质胶结相;2基于七条常规测井曲线数据,依托SPSS数据处理平台,根据因子分析法的原理提取压实因子F_1、孔隙因子F_2和泥质因子F_3,三因子与研究区不同类型的成岩相之间存在着良好的对应关系;3统计研究区不同成岩相类型的三因子值范围,建立本区致密砂岩储层成岩相三因子定量评价标准,为致密砂岩储层成岩相的划分提供新的思路和方法。

The application of factor analysis method in diagenetic facies division in tight sandstone reservoirs

: Quantitative evaluation is the key and difficult point in the study of reservoir diagenetic facies. According to the comprehensive investigation of cast slice observation, common slice observation, cathode luminescence, SEM and core photos, diagenetic facies of tight reservoirs in Xujiahe Formation, north Sichuan Basin has been studied thoroughly. And quantitative evaluation criterion has been tried to established by the utilization of factor analysis. The result showed that: 1) The diagenetic facies of research area were divided into into constructive diagenetic facies and destructive diagenetic facies. Constructive diagenetic facies included shale package dissolution diagenetic facies and unstable components dissolution diagenetic facies; destructive diagenetic facies included strong compaction diagenetic facies (strong compaction diagenetic facies of tight sandstone and strong compaction diagenetic facies of mudstone) and calcium cementation diagenetic facies. 2)Based on seven conventional logging date, relying on SPSS date processing platform, using principal component analysis, three factors, including compaction factor F1,porosity factor F2 and shale factor F3, were extracted. Good corresponding relationship was found between different types of diagenetic facies and three factors. 3)On the date of three factors value range, three factors quantitative classification criteria for tight sandstone reservoir diagenetic facies in this area has been established, which has provided new ideas and methods for diagenetic facies division in tight sandstone reservoirs.