摘要
针对滇东威信地区龙潭组煤系致密砂岩气勘探开发程度较低的现状,利用铸体薄片和扫描电镜观察,分析致密砂岩孔隙显微特征;利用高压压汞实验和分形原理,分析致密砂岩储层的分形特征.结果表明,研究区龙潭组致密砂岩孔隙主要以次生孔隙为主,原生孔隙不甚发育,其中纳米孔隙占优势地位.计算得到的压汞分形维数范围为2.728~2.966,平均值为2.886,表明岩石内部孔隙结构复杂,联通性差,且岩石内部非均质性较强.计算的扫描电镜分形维数范围为1.352~1.559,平均值为1.466.对两分形维数进行回归分析,二者相关性显著.
In view of the low exploration and development level of tight sandstone gas in the Longtan Formation coal measures in Weixin area of eastern Yunnan,casting thin sections and scanning electron microscopy were used to analyze the microscopic characteristics of tight sandstone pores.The fractal characteristics of tight sandstone reservoirs were analyzed through a high-pressure mercury injection experiment and fractal principle.The results showed that the pores in the tight sandstone of the formation in the study area were mainly secondary pores,and primary pores were not very developed,and nanopores were dominant.The calculated fractal dimension of mercury injection ranged from 2.728 to 2.966,with an average value of 2.886,indicating that the pore structure inside the rock was complex,the connectivity poor,and the heterogeneity inside the rock strong.The calculated fractal dimension of scanning electron microscope ranged from 1.352 to 1.559 with an average of 1.466.The regression analysis of the above two fractal dimensions showed that the correlation between them was very obvious.
作者
师帅
何金先
张晓丽
王健
杨甜甜
谢莹
SHI Shuai;HE Jin-xian;ZHANG Xiao-li;WANG Jian;YANG Tian-tian;XIE Ying(Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process,Ministry of Education,China University of Mining and Technology,Xuzhou 221008,Jiangsu,China;School of Resource and Geoscience,China University of Mining and Technology,Xuzhou 221116,Jiangsu,China;Research Institute of Exploration and Development,Huabei Oilfield Company,PetroChina,Renqiu 062552,Hebei,China)
出处
《兰州大学学报(自然科学版)》
CAS
CSCD
北大核心
2023年第1期106-111,共6页
Journal of Lanzhou University(Natural Sciences)
基金
国家重点研发计划项目(2021YFC2902003)
国家自然科学基金项目(41702170)。
关键词
孔隙分形
高压压汞
扫描电镜
龙潭组
威信地区
pore fractal
high pressure mercury intrusion
scanning electron microscope
Longtan Formation
Weixin area