准噶尔盆地吉木萨尔凹陷芦草沟组致密储层微观孔隙特征  

Characteristics of the micro-pore in Lucaogou-Formation tight reservoir of Jimsar Sag,Junggar Basin

作　　者：马铨峥[1] 杨胜来[1] 杨龙 邹成 王君如 MA Quanzheng;YANG Shenglai;YANG Long;ZOU Cheng;WANG Junru(MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China;Research Institute of the Experiments, PetroChina Xinjiang Oilfield Company, Karamay 834000, China)

机构地区：[1]中国石油大学石油工程教育部重点实验室,北京102249 [2]中国石油新疆油田公司实验研究所,新疆克拉玛依834000

出　　处：《大庆石油地质与开发》2020年第6期13-20,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家重点基础研究发展“973”计划“陆相致密油高效开发基础研究”子课题“提高致密油储层采收率机理与方法研究”(2015CB250904)。

摘　　要：为了认识准噶尔盆地吉木萨尔凹陷芦草沟组致密油储层微观孔隙结构,采用铸体薄片、扫描电镜、恒速压汞以及微—纳米CT扫描技术,对准噶尔盆地吉木萨尔凹陷芦草沟组致密储层的储集空间类型、物性特征以及孔隙分布特征进行了研究。结果表明:芦草沟组致密储层孔隙类型主要分为晶间孔、溶孔、微裂缝3类;岩石颗粒直径主要为0.01~0.06 mm,粒度分布均匀、分选性好;储层孔隙度为5.45%,渗透率为0.064×10-3μm2;微米孔隙连通性好,主要孔隙半径为10~70μm,纳米孔隙连通性较差,主要孔隙半径为0.1~0.3μm;大孔隙占总孔隙数量的4%,但对总孔隙体积贡献率却高达69.5%。该研究成果可为芦草沟组致密油藏合理开发提供指导。In order to understand the micro-pore structure of tight oil reservoirs in Lucaogou Formation of Jimsar Sag, Junggar Basin,with the help of thin-section, scanning electron microscope, constant-velocity mercury injection and micron-nano CT scanning techniques, the accumulation space types, physical properties and pore distribution characteristics were researched for Lucaogou-Formation tight reservoirs in Jimsar Sag,Junggar Basin. The results show that the pore types of the tight reservoirs in Lucaogou Formation are mainly divided into three types: intercrystalline pore, dissolved pore and microcrack;the particle diameters of the rock are mainly between 0.01~0.06 mm, the particle size distribution is uniform and the sorting property is good;the reservoir porosity and permeability are 5.45% and 0.064×10-3μm2 respectively;at the micrometer scale, the connectivity of the pores is good, the pore radii are mainly distributed between 10~70 μm, while at the nanometer scale, the connectivity is rather poorer, the pore radii are mainly distributed between 0.1~0.3 μm;although the large pores account for only 4% of the total pore number, their contribution to total pore volume is as high as 69.5%. The research result can provide the guidance for the rational development of the tight reservoir in Lucaogou Formation.

关 键 词：致密油储层 微观孔隙结构 微—纳米CT 孔隙分布特征 准噶尔盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]