西峰油田长8油层组成岩储集相研究

Study on Diagenetic Reservoir Facies of Chang 8 Reservoir in Xifeng Oilfield

以沉积相为基础,利用岩心系统观察及各类薄片鉴定、X-衍射、阴极发光、扫描电镜、图像分析、有机质成熟度等实验分析测试资料,系统研究了西峰油田长8油层储层岩矿特征、成岩作用、储集空间及其演化特征,并对主要成岩作用进行了定量评价。综合以上研究,确定研究区主要发育3类成岩储集相类型:不稳定组分溶蚀次生孔隙成岩储集相、中等压实弱-中胶结混合孔隙成岩储集相、强压实强胶结残余粒间孔成岩储集相,其中不稳定组分溶蚀次生孔隙成岩储集相是最有利于油气储集的成岩储集相类型。

Based on study of sedimentary fancies,core observation and the data of thin-section identification,X-ray diffraction,cathodoluminescence,SEM electronic probe spectrum,image analysis and organic matter maturity etc.were used for a systematical study of lithologic property,diagenesis,reservoir space and its evolution character,the space evolution were discussed,the diagenesis was quantitatively evaluated.Based on the study stated above,three types of diagenetic reservoir facies are determined,that is unstable dissolution induces pore diagenetic facies,moderate compacted weak-moderate cementation mixes pore diagenetic facies,strongly compacted moderate cementation relict induces intergranular diagenetic facies,in which the unstable dissolution induced pore diagenetic facies is the most favorable type for reserving.