自生绿泥石对砂岩储层孔隙度-渗透率关系的影响——以鄂尔多斯盆地姬塬—华庆地区三叠系长8油层组为例  

Influence of authigenic chlorite on the relationship of porosity to permeability in the sandstone reservoir:A case study from Chang-8 oil-bearing formation of Triassic in Jiyuan-Huaqing area,Ordos Basin

作　　者：兰叶芳[1,2] 黄思静[1,2] 梁瑞[1,2] 张雪花[1,2] 

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]成都理工大学沉积地质研究院,成都610059

出　　处：《成都理工大学学报（自然科学版）》2011年第3期313-320,共8页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家重大专项(2008ZX05001-004-003)

摘　　要：主要以孔隙衬里方式产出的自生绿泥石是鄂尔多斯盆地姬塬—华庆地区三叠系长8油层组含量最高的自生黏土矿物。自生绿泥石含量与砂岩储层孔隙度-渗透率关系的计算表明,自生绿泥石对姬塬—华庆地区砂岩储层孔隙度-渗透率关系产生直接影响。总的来说,随着砂岩中自生绿泥石含量的增加,要获得相同渗透率所需要的孔隙度是增加的;但对于不同的渗透率区间和不同的自生绿泥石含量,获得相同渗透率所需要孔隙度增加的幅度是不同的。基于自生绿泥石对孔隙度-渗透率关系的影响,在考虑姬塬—华庆地区的孔隙度下限（如进行与孔隙度有关的储量计算或定义渗砂岩）时应考虑自生绿泥石含量的高低。假定以0.1×10-3μm2的渗透率为参照,对于姬塬—华庆地区长8油层组而言,缺乏自生绿泥石或自生绿泥石含量较低时,可以考虑采用7%~8%的孔隙度下限;当自生绿泥石含量较高时,如自生绿泥石的质量分数为8%~10%或更高的时候,则应该考虑采用9%~10%的孔隙度下限。The content of authigenic chlorite mainly presented in the form of pore-lining cement is the highest in the authigenic clay minerals in Chang-8 oil-bearing formation of Triassic in the Jiyuan-Huaqing area of Ordos Basin.The calculation of content of authigenic chlorite and the relationship between porosity and permeability show that the distribution characteristics of the authigenic chlorite have a direct impact on the relationship of porosity to permeability in the sandstone reservoir.Overall,with the increasing of the content of the authigenic chlorite in sandstone,the porosity tends to increase to obtain the same permeability.However,for different ranges of permeability and contents of the authigenic chlorite,the porosity increases in different degrees to get the same permeability.Based on the principle,when considering the limit of porosity for defining the permeable sandstone or calculating reserves,the content of the authigenic chlorite should be considered.For example,for the permeability of 0.1×10-3μm2 of Chang-8 oil-bearing formation in the Jiyuan-Huaqing area,when authigenic chlorite lacks or has a lower content,the limit of porosity could be 7%~8%,while authigenic chlorite has a higher content,for instance,the chlorite content is 8% ~10% or higher,the limit of porosity could be 9%~10%.

关 键 词：自生绿泥石 孔隙度 渗透率 长8油层组 姬塬—华庆地区 

分 类 号：P588.21[天文地球—岩石学]