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以坪庄-白豹地区长6砂岩为研究对象,以薄片鉴定、扫描电镜及物性分析为手段,对研究区长6砂岩矿物学特征、成岩作用、物性等方面进行了详细的论述。结果表明研究区岩性以长石砂岩、岩屑砂岩为主,成分成熟度很低;成岩作用类型包括压实压溶、胶结作用、交代作用和溶解作用,其中孔隙类型以粒间孔为主,其次为粒间溶孔、长石溶孔、岩屑溶孔、晶间孔;溶蚀作用对孔隙的形成具有重要的影响;压汞资料显示为高排驱压力、高中值压力的特点,总体上表现为低孔低渗储层。储集性能差的主要原因有:一是砂岩粒径较小;二是储层孔喉以小微喉为主;三是填隙物含量普遍较高。并将研究区长6砂岩储层分为四类,即Ⅰ类(好)储层;Ⅱ类(中等)储层;Ⅲ类(差)储层;Ⅳ类(极差)储层。
Taking Ping 6zhuang - Baibao area Chang 6 sandstone as the research object, the mineralogical characteristics, diagenesis and physical properties of the Chang 6 sandstone in the study area are discussed in detail by means of thin slice identification, scanning electron microscopy and physical property analysis. The results show that the lithology in the study area is dominated by feldspar sandstone and lithic sandstone, and the compositional maturity is very low. Diagenesis types include compaction pressure solution, cementation, metasomatism, and dissolution, of which pore type is mainly intergranular , Followed by intergranular dissolved pores, feldspar dissolved pores, cuttings dissolved pores and intergranular pores. The dissolution has an important effect on the formation of pores. The mercury intrusion has the characteristics of high displacement pressure and high median pressure. Overall On the performance of low porosity and permeability reservoir. The main reasons for poor reservoir performance are: First, smaller sandstone particle size; second, small pore throats throat to the main; Third, the interstitial content is generally higher. There are four types of sandstone reservoirs in the study area, namely Class Ⅰ (good) reservoirs, Ⅱ (medium) reservoirs, Ⅲ (poor) reservoirs and Ⅳ (very poor) reservoirs.