鄂尔多斯苏里格气田二叠系低孔低渗储层成因  

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

作　　者：南珺祥[1,2] 解丽琴[1] 刘绥保[3] 石小虎[3] 王素荣[3] 

机构地区：[1]西北大学地质学系 [2]长庆油田公司勘探开发研究院,陕西西安710021 [3]长庆油田公司勘探开发研究院

出　　处：《西北大学学报（自然科学版）》2005年第2期207-211,共5页Journal of Northwest University（Natural Science Edition）

摘　　要：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。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

关 键 词：鄂尔多斯盆地 苏里格气田 二叠系 储层 沉积分异作用 石英岩 

分 类 号：P618.13[天文地球—矿床学]