南山坪古油藏灯影组白云岩储层成岩作用研究

Research on dolomite reservoir diagenesis of Dengying formation in Nanshanping ancient reservoir

南山坪古油藏储层是华南上震旦统灯影组白云岩储层的典型代表。通过对该储层及储层内残留沥青的野外剖面和显微镜下观察分析,研究了该储层的储集性特征和成岩演化过程。根据储层矿物的结构成分和孔隙的形成及演化,将该储层的演化过程划分为沉积阶段、第一次浅埋阶段、表生阶段、第二次浅埋阶段、深埋阶段、构造运动阶段六个阶段。南山坪灯影组储层为台地边缘浅滩和滩间相沉积,沉积形成的细粉晶白云岩、泥晶白云岩及鲕粒白云岩是后期成岩改造的物质基础。白云石化作用和表生岩溶作用是主要的建设性成岩作用,形成了油气储存的主要空间。

Nanshanping ancient reservoir is the typical representative of Southern China's Upper Sinian Dengying formation in dolomite reservoir. Based on the field profiles analysis and observation under microscope of the asphalt residue on the reservoir and within reservoir, the reservoir characteristics and diagenesis evolution process is studied. According to the reservoir mineral composition and pore formation and evolution, the reservoir evolution process is divided into six stages as deposition phase, the first shallow phase, supergene stage, the second shallow stage, deep buried stage and tectonic movement stage. Nanshanping Dengying formation reservoir is the platform edge shallow and inter-bank deposition, the fine powder crystal dolomite, micritic dolomite, oolitic dolomite formed in the deposition is the material basis of late diagenetic reformation. Dolomitization and supergene karstification is the main constructive diagenesis, which formed the main space for oil and gas storage.