鄂尔多斯盆地东缘上古生界致密砂岩储层物性下限标准研究  

Study on the lower limit standard of physical properties of Upper Paleozoic tight sandstone reservoir in the eastern margin of Ordos Basin

作　　者：路媛媛 刘畅[1] 郭明强[1] Lu Yuanyuan;Liu Chang;Guo Mingqiang(China United Coalbed Methane Corporation Ltd.,Beijing 100011)

机构地区：[1]中联煤层气有限责任公司,北京100011

出　　处：《石化技术》2022年第7期151-153,共3页Petrochemical Industry Technology

摘　　要：含气致密储层物性下限正随着开采工艺技术的提高逐渐降低,并趋向于地质条件下天然气充注的成藏物性下限。利用水膜厚度法,考虑甲烷分子的大小及孔喉半径,对鄂尔多斯盆地东缘上古生界致密砂岩储层的成储理论下限展开研究,求出的束缚水膜的厚度为68nm,结合甲烷稳定层吸附厚度(20nm),得出临界孔喉半径下限约为88nm,对应渗透率下限值约为0.07mD,只有当最大孔喉半径>临界半径(88nm)时,天然气才有可能聚集成藏。进一步结合现场试气及测井解释结果,确定研究区目前的技术开采下限为:孔隙度为6.0%,渗透率为0.1mD。The lower limit of physical properties of gas bearing tight reservoirs is gradually decreasing with the improvement of production technology,and tends to the lower limit of reservoir forming physical properties of natural gas filling under geological conditions. Using the water film thickness method,considering the size of methane molecules and pore throat radius,this paper studies the theoretical lower limit of reservoir formation of Upper Paleozoic tight sandstone reservoir in the eastern margin of Ordos Basin. The thickness of bound water film is 68nm.Combined with the adsorption thickness of methane stable layer(20nm),it is concluded that the lower limit of critical pore throat radius is about 88nm and the corresponding lower limit of permeability is about 0.07md. Only when the maximum pore throat radius is greater than the critical radius(88nm),Only natural gas can accumulate into reservoirs. The lower limit of permeability is further determined as 0.1md in combination with the logging technology and the interpretation result of the gas test area.

关 键 词：水膜厚度 孔喉半径 物性下限 致密砂岩储层 鄂尔多斯盆地东缘 

分 类 号：P618.13[天文地球—矿床学]