黔西北地区上二叠统龙潭组泥页岩储层特征  

The characteristics of the Upper Permian shale reservoir in the northwest of Guizhou Province,China

作　　者：李娟[1,2] 于炳松[2] 夏响华[1] 田玉昆[1] 李英烈 周惠[1] 马勇胜[1] 

机构地区：[1]中国地质调查局油气资源调查中心,北京100029 [2]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《地学前缘》2015年第1期301-311,共11页Earth Science Frontiers

基　　金：国土资源部全国油气资源战略选区调查与评价(1211302108025;1211302108021);教育部高等学校博士学科点专项科研基金优先发展领域项目(20120022130001)

摘　　要：贵州省发育多套含气页岩层系,近年来对于寒武系和志留系黑色页岩进行了较为深入的研究,但是对于上二叠统龙潭组黑色页岩储层研究较为缺乏。文中通过对黔西北地区上二叠统龙潭组黑色页岩进行全岩X衍射矿物分析、TOC含量和Ro、比表面和孔径等测试,特别是场发射扫描电镜实验,分析了龙潭组页岩孔隙类型及储层特征。结果表明:黔西北地区上二叠统龙潭组页岩主要矿物组成是黏土矿物(41.4%)和石英(47.8%)。从空间上看页岩中黏土矿物含量从北向南先减少后增加,石英含量在大方县中部和南部较高。龙潭组黑色页岩的孔隙以中孔为主,空间上从北向南呈现周期性的变化规律。龙潭组泥页岩孔隙分为3类,即粒间孔、粒内孔和有机孔。其中有机孔主要为纳米级,数量丰富,一般呈不规则的圆形,是吸附态赋存的天然气的主要储集空间,具有重要的研究价值。龙潭组页岩孔隙特征受TOC含量和黏土矿物影响明显。有机碳含量高,则微孔越丰富。黏土矿物含量高,则中孔较丰富。石英则对宏孔体积贡献较大。这样定量实验的结果很好的对应了扫描电镜中定性观察的结果。Although there are series of strata with gas-bearing shale in Guizhou Province,the main work was focused on the black shale of Cambrian and Silurian systems instead of the Upper Permian Longtan Formation.In order to make up such shortage,the black shale of the Upper Permian Longtan Formation in the northwest of Guizhou Province was studied by the X-ray diffraction mineral analysis of whole rock,by the tests of surface area,TOC and Ro,and especially by the field emission scanning electron microscopy.The average content of quartz is 47.8% with the highest content in the middle and south of Dafang County,and clay minerals is41.4%,which decreases first then increases from north to south.The researched pores are mainly mesopores and have a periodic trend from north to south.A classification,consisting of three major pore types,i.e.,interparticle pores,intraparticle pores and organic-matter pores,is presented.It is worth mentioning that organic-matter pores are abundant and of great importance.With increasing TOC,micropore volumes relatively increase.The volumes of mesopore increase with a greater sum of clay minerals.And quartz contributes to the sum of macropores.Thus qualitative observation by the field emission scanning electron microscopy verified the quantitative experimental analysis.

关 键 词：孔隙类型 孔隙体积 黑色页岩 龙潭组 黔西北地区 

分 类 号：P618.130.21[天文地球—矿床学]