西南石油大学学报（自然科学版）2025，Vol.47Issue(4)：75-86,12.DOI:10.11885/j.issn.1674-5086.2024.04.12.04
西湖凹陷HY气田储层孔隙结构差异对其渗流特征的影响
The Influence of Differences in Pore Structure of HY Gas Field Reservoir in Xihu Depression on Its Permeability Characteristics
段冬平 1刘彬彬 1庞榆 2时琼 1李文俊 1唐洪明3
作者信息
- 1. 中海石油(中国)有限公司上海分公司,上海长宁 200051
- 2. 中国石油西南油气田公司勘探开发研究院,四川成都 610041
- 3. 西南石油大学地球科学与技术学院,四川成都 610500
- 折叠
摘要
Abstract
Accurate characterization of microscopic pore structure is the key to evaluating reservoir resources and productivity.Taking the low-tight permeability sandstone reservoir of the Huagang Formation in the HY Gas Field of the Xihu Depression as an example,pore structure parameters are characterized on a full-scale basis by combining low-pressure nitrogen adsorp-tion,high-pressure mercury injection,and nuclear magnetic resonance technology.Combined with the steady-state gas-water relative permeability and movable fluid saturation experiments,the reservoir seepage mechanism and control factors are com-prehensively evaluated.The results show that the proportion of dissolved pores in reservoir samples increases,and the pore size decreases gradually from type Ⅰ to type Ⅳ reservoirs in the study area.The proportions of pore throats with radius greater than 1 μm are 50.7％,41.3％,25.2％and 5.7％,respectively.With the deterioration of pore structure quality,the gas-water relative permeability curve in the study area shifts to the right,and the irreducible water saturation ranges from 15％to 55％.The effec-tive permeability of the gas phase ranges from 0.01 to 9.00 mD,and the water saturation in the range of gas-water co-seepage is 6％～65％.When the flowback pressure gradient is 9 MPa/m,the average movable fluid saturation of the reservoir exceeds 50％,and the pore throat connectivity is good.The water film occurs in the pore throat radius μm.The reservoir seepage capacity is worse where a larger proportion of the water film.The research results have significant guidance for formulating effective development countermeasures and predicting gas well productivity in this area.关键词
花港组/低渗致密砂岩/孔隙结构/渗流机理/可动流体Key words
Huagang Formation/low-tight permeability sandstone/pore structure/seepage mechanism/movable fluid分类
能源科技引用本文复制引用
段冬平,刘彬彬,庞榆,时琼,李文俊,唐洪明..西湖凹陷HY气田储层孔隙结构差异对其渗流特征的影响[J].西南石油大学学报（自然科学版）,2025,47(4):75-86,12.
