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鄂尔多斯盆地白豹—坪庄地区延长组长6储层是该区主要的产油层,也是典型的低孔、低渗储集层,具有粒度细、成分成熟度低、磨圆度较差、分选性较好的岩石学特征。结合铸体薄片、扫描电镜、粘土X衍射以及物性等资料,对长6储层砂岩的成岩作用进行了研究,确定其成岩作用类型主要有压实作用、压溶作用、胶结作用、交代作用及溶解作用等,其中前4种为破坏性成岩作用,最后一种为建设性成岩作用。对成岩演化序列的研究表明,长6储层砂岩的成岩阶段已达到中成岩B期的早期阶段。综合成岩作用类型的组合方式,建立了成岩演化模式,重点从成岩演化过程入手,对成岩相特征进行了细致研究,划分出了7种成岩相类型。
Chang 6 reservoir of Yanchang Formation in Baibao-Pingzhuang area of Ordos Basin is a major oil reservoir and a typical low-porosity and low-permeability reservoir with fine grain size, low maturity and poor roundness. Selected petrology characteristics better. The diagenesis of sandstone in Chang 6 reservoir has been studied with the help of the thin films, SEM, clay X-ray diffraction and physical properties. The diagenesis types are mainly compaction, pressure dissolving, cementation, metasomatism and Dissolution, etc. Among them, the first four are destructive diagenesis and the last one is constructive diagenesis. The study on the diagenetic evolution sequence shows that the diagenetic stage of the Chang 6 reservoir sandstone has reached the early stage of the B diagenetic stage. Based on the combination of diagenesis types, the diagenetic evolution model was established. The diagenetic evolution was mainly focused on the characteristics of diagenetic facies. Seven types of diagenetic facies were identified.