鄂尔多斯苏里格气田二叠系低孔低渗储层成因

目的 通过鄂尔多斯盆地苏里格地区二叠系低渗储层成因的分析，指出该区相对优质储层的分布区。方法 以储层微观岩石学研究为基础，对石英砂岩、岩屑砂岩的形成机理及低孔、低渗储层的成因进行了分析，并对储层成岩作用进行了定量化的研究。结果 该区石英砂岩、岩屑砂岩的形成是沉积分异作用的结果，不同岩性致密化机理有较大的差异，石英砂岩是由于硅质胶结作用使其致密化，而岩屑砂岩是以压实作用为主的致密化。结论 该区孔隙组合以粒间孔-溶孔为主，溶孔主要是片岩、千枚岩、长石及喷发岩等岩屑中不稳定矿物或组分溶蚀而成的，粒间孔-溶孔孔隙组合的储层是该区最好的储层。

The contributing factors of lower porosity and permeability resevoir in permian in Sulige Gas-field , Ordos Basin

Aim To study the relevant features of the Permian resevoirs in the Sulige Gas-field.Methods Based on microcosmic petrology research analyzing the formation mechanism of quartz sandstone and lithic sandstone, researching the formation causes of lower porosity and permeability resevoirs.Results The formation of the quartz sandstone and the lithic sandstone are refered to as the two chief kinds of sandstone which can attribute to sedimentation partition.And there exist great distinctives in compact mechanism of different rocks.Silicon gluing function makes quartz sandstone denser and more solid. But the density and solidity of the lithic sandstone is due to the press of layers above.And diagenesis is determined by the amounts of research.Conclusion Porosity association types which assemble in this area are intergranular pore-dissoluti on pore association .And dissolution pore thiefly assembles in some instable minerals which are prone to be eroded such as schist, phyllite,feldspar and eruption rock bits.Meanwhile it can be brought forward that the resevoir which contains intergrnular pore-dissolution pore association is the best in the area. tioncausesoflowe lithicsandstoneare dthereexistgreat