论文部分内容阅读
在铸体薄片鉴定、粒度分析及物性分析统计的基础上,对定边唐山地区长2、长6段砂岩储层的孔隙类型、孔隙结构等微观特征进行了深入分析,结果表明:长2、长6段储集空间主要为粒间溶孔、原生残余粒间孔、岩屑粒内溶孔、杂基溶孔和高岭石晶间孔,局部发育微裂隙;渗透率随孔隙度的增大而增大,而孔隙度和渗透率的大小又与砂岩的孔隙结构有关。优质储层具粗粒结构和含砾支撑结构,这种结构有利于孔隙水的流动,促进填隙物溶蚀和粒间溶孔的形成。指出粗粒结构与含砾支撑结构的石英砂岩储层物性较好;含砾支撑结构储层具有双众数粒度分布特征,有利于孔隙水的流动,促进填隙物溶蚀和粒间溶孔的形成,使得储层的渗透率得到提高。
On the basis of identification of castings, particle size analysis and statistics of physical properties, the pore types, pore structure and other microscopic features of sandstone reservoirs of Chang 2 and Chang 6 of Dingbian Tangshan area are analyzed in depth. The results show that: The main reservoirs of Chang 6 section are intergranular dissolution pores, primary remnant intergranular pores, intragranular dissolution pores of lithic debris, intermetallic solute pores and kaolinite intergranular pores, and local development of micro-cracks. Permeability increases with porosity Large and increase, while the size of porosity and permeability and sandstone pore structure. High-quality reservoirs with coarse-grained structure and pebble-bearing structure, this structure is conducive to the flow of pore water to promote interstitial erosion and intergranular dissolved pore formation. It is pointed out that the sandstone reservoir with coarse-grained structure and gravelly-supported structure is better in physical properties. The reservoir with gravel support structure has dual-mode particle size distribution, which is favorable for the flow of pore water and the promotion of interstitial dissolution and intergranular dissolution Formed, making the reservoir permeability increased.