马朗凹陷中、上侏罗统成岩作用与孔隙演化

目的探讨马朗凹陷成岩作用与孔隙演化的关系。方法在野外调研和资料调研的基础上,结合薄片鉴定、电镜扫描、X射线衍射、阴极发光、压汞、铸体、热解分析、镜质体反射率、包裹体测试等分析手段,对砂岩的成岩作用和孔隙特征进行分析。结果确定了成岩作用类型、成岩阶段划分与孔隙演化特征。结论中、上侏罗统砂岩成岩作用类型主要有压实作用、胶结作用和溶解作用;成岩演化阶段处于早成岩A期至中成岩A期;不同层段所经历的成岩演化不同,导致了孔隙发育程度和类型的不同。

Diagenesis and porosity evolution in the Middle-Upper Jurassic in Malang Depression

Aim To discuss the relationship of diagenesis and porosity evolution in Malang Depression.Methods Based on field exploration and information collection,analyge diagenesis and porosity evolution of sandstone,combining the analysis of slice identification,scanning electron microscope,X-ray diffraction,cathodoluminescence,mercury penetration,moldic pore,pyrogenation,reflectivity of vitrinite,fluid inclusions,etc.Results Types of diagenesis,division of diagenetic stage and characteristics of porosity evolution were ascertained.Conclusion Types of diagenesis in the Middle-Upper Jurassic include compaction,cementation,dissolution;the diagenetic stage of reservoirs in the Middle-Upper Jurassic was in the period from A-substage of early diagenesis to A-substage of middle diagenesis;the development and types of porosity of reservoirs was induced by diagenesis evolution of different formations.