陆东凹陷库伦塔拉洼陷下白垩统储层特征

通过薄片、扫描电镜和压汞法等分析测试手段，从储层岩石学特征、成岩作用、孔隙类型和孔隙结构以及粘土矿物对储层的影响等方面开展了陆东凹陷库伦塔拉洼陷的储层微观特征研究，分析了储集空间类型、孔隙结构、成岩作用以及影响储层流体分布的主要因素。研究表明，区内储集岩为低成熟度砂岩类，其孔隙类型主要有残余粒间孔、次生孔以及微孔隙，孔喉结构类型分为特细喉较均匀型、特细喉不均匀型、特细喉特不均匀型、徽细喉均匀型、微细喉较均匀型及微细喉不均匀型。储层成岩作用较强，主要经历了压实、胶结、交代、粘土矿物转化和溶解等5种成岩作用，前4种成岩作用对储层物性均有损害，溶解作用对增强储层渗透性起到了关键作用。

Reservoir characteristics of lower Cretaceous of Kuluntala Subsag in Ludong Sag

Microscopic characteristics of the lower Cretaceous reservoirs of Kuluntala Subsag in Ludong Sag are analyzed by several tools of thin section, scanning electron microscope and mercury in-trusion method in the aspects of the effect of petrology characteristics, diagenesis, pore types,pore structure and clay minerals on the reservoirs. The reservoir space types, pore structure, diagenesis and the mian influencing factors of reservoir fluid distributiont are analyzed. The research indicates that the reservoir rocks in this area belong to the low-maturity sandstones, whose pore types are residual intergranular pore, secondary pore,and microfissure. There are six kinds of pore throat structure : superfine throat with relative uniformity, superfine throat with no uniformity, superfine throat with inhomogeneity, mi-crofine throat with uniformity, microfine throat with relative uniformity, and microfine throat with no uniformity. The diagenesis of the reservoirs is strong. There are five kinds of diagenesis including compaction,cementation,metasomatism,the conversion of the clay minerals and the dissolution. The former four kinds of diagenesis do harm to physical properties of the reservoirs, and the dissolution is the key to improving the permeability of the reservoirs.