特低渗透砂岩储层成岩作用对储层性能影响

Influence of Diagenesis on Reservoir Performance of Ultra-low Permeability Sandstone Reservoir

储层物性及微观结构是反映储层好坏的重要评价指标,成岩作用是影响储层性能的重要地质作用。通过对铸体薄片、扫描电镜等资料的分析,明确了研究区的矿物岩石学特征,确定了研究区特低渗透储层砂岩成岩作用特征,并结合研究区的压汞、物性分析等资料分析了不同成岩作用对储层性能的影响。结果表明,由于沉积亚相、油源距离不同,不同层位不同区位的储层成岩作用有差异;强烈的压实、胶结作用是储层变差的主要原因。

Physical properties and microstructure of a reservoir are important indicators for its quality.Diagenesis is an important geological process that affects reservoir performance.Based on the analysis of casting thin section and scanning electron microscope,the mineral petrological characteristics of the study area were defined and the diagenesis characteristics of sandstone in ultra-low permeability reservoir were explored.Combined with the data of mercury injection and physical property analysis in the study area,the effects of different diagenesis on reservoir performance were also analyzed.The results showed that due to the difference of sedimentary subfacies and oil source distance,the reservoir diagenesis was different in different layers and locations as strong compaction and cementation were the main factors for reservoir deterioration.