延吉盆地下白垩统砂岩储层特征研究

Research on Reservoir Characteristics of Lower Cretaceous Sandstone in Yanji Basin

通过扫描电镜、铸体薄片、普通薄片、压汞曲线以及孔隙度和渗透率资料的分析,详细研究了砂岩储层特征,主要包括岩石学特征、孔隙结构、储集空间、储层物性特征等。结果表明,延吉盆地下白垩统砂岩储层岩石类型为长石砂岩、岩屑长石砂岩和长石岩屑砂岩;砂岩储层孔隙类型主要是次生孔隙,其中次生粒间溶孔占绝对优势,其次是粒内溶孔;影响储层物性的主要因素为成岩作用,经历的主要成岩作用类型有机械压实作用、胶结作用、交代作用、蚀变作用和溶解作用。

By analyzing the photos of scanning electron microscopy and thin section, intrusive mercury curve and materials of porosity and permeability, the reservoir characteristics of sandstone member are discussed, which include petrologic feature, pore structure, reservoir space and reservoir properties of matter. The result shows that the sandstone reservoir rock-types are feldspar sandstone, feldspar debris sandstone and debris feldspar sandstone in lower cretaceous of Yanji basin.. The mainly type of the reservoir pores are secondary pores, mainly are secondary dissolution pores between grains and relatively less dissolution pores in grains can be seen in this area. The main diagenesis types include the machine-made compaction, cementation, displacement alteration and dissolution.