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鄂尔多斯盆地子洲-清涧地区上古生界山32段砂岩储层以石英砂岩为主,其次为岩屑质石英砂岩和岩屑砂岩。目前储层正处于晚成岩阶段B期,成岩作用类型包括压实作用、胶结作用、交代作用和溶蚀作用,机械压实作用、压溶作用和自生黏土矿物的胶结作用是低孔低渗储层形成的主要原因,成岩晚期的溶蚀作用大大改善了砂岩储层的储集空间。根据成岩作用的特点,将研究区山32段划分出5个成岩相:压实压溶相、弱压实-硅质胶结相、弱压实-自生黏土矿物胶结相、弱压实-碳酸盐胶结相、弱压实-溶蚀相。压实压溶相储层物性最差;弱压实-硅质胶结相、弱压实-自生黏土矿物胶结相和弱压实-碳酸盐胶结相储层的孔隙度、渗透率总体也很低;弱压实-溶蚀相储层的储集空间最发育、连通性最好,孔隙类型以粒间孔、粒间溶孔、粒内溶孔为主。
Sandstone reservoirs in Upper Paleozoic Shan 32 of Zizhou-Qingjian area of Ordos Basin are dominated by quartz sandstone, followed by lithic quartzite sandstone and lithic sandstone. At present, the reservoirs are in late diagenetic stage B, diagenesis types include compaction, cementation, metasomatism and dissolution, mechanical compaction, pressure solution and cementation of authigenic clay minerals are low porosity and low permeability reservoirs The main reason for the formation of the diagenetic dissolution in the late stage greatly improved the reservoir space for sandstone reservoirs. According to the characteristics of diagenesis, five diagenetic facies are divided into 32 segments in the study area: compaction pressure dissolving facies, weak compaction-siliceous cementing facies, weak compaction-authigenic clay mineral binding facies, weak compaction-carbonate Salt binder phase, weak compaction - dissolution phase. The properties of compacted and pressure-dissolved reservoirs are the worst. The porosity and permeability of weakly compacted-siliceous, weakly compacted-authigenic clay mineral and weakly compacted-carbonate cemented reservoirs are also very poor Low. The reservoirs of weakly compacted-eroded reservoirs are the most developed and the most accessible. The types of pores are mainly intergranular pores, intergranular dissolved pores and intragranular dissolved pores.