天然气勘探与开发2025，Vol.48Issue(2)：69-80,12.DOI:10.12055/gaskk.issn.1673-3177.2025.02.007
青石峁气田储层特征与气水渗流规律
Reservoir characteristics and gas-water seepage laws in Qingshimao gasfield,Ordos Basin
摘要
Abstract
As a new exploration and development domain of tight gas in Ordos Basin,Qingshimao gasfield is the first large one with the natural-gas reserves exceeding 100 billion cubic meters in Ningxia Hui Autonomous Region.Low gas production and high water-gas ratio emerged at the process of production test in this field,creating more challenges in beneficial development of tight-gas sandstone reservoirs.Thus,the eighth member of the Permian Lower Shihezi Formation(He 8 Member)was taken as an example to probe into physical properties and pore-throat microstructure in such reservoirs by means of porosity and permeability analysis,cast thin-section identification,and constant-rate mercury injection in order to figure out gas-water seepage laws and development mechanisms.Then,the initial water saturation was ascertained for these reservoirs on the basis of the sealed coring for pyrolysis weighing,routine coring or displacement and nuclear magnetic resonance.Additionally,both seepage laws and development mechanisms were made clear with the help of gas-water two-phase seepage experiments.Results show that(i)with low porosity and permeability,and medium to high water saturation,this member is generally tight gas reservoirs in which three types are developed,i.e.,matrix porous type,fractured type,and matrix porous or underdeveloped fractured type;(ii)partial waterbody in some reservoirs whose characteristics are tight matrix,locally developed fractures and higher initial water saturation,is prone to non-uniform fingering along fractures.Hence,controlling water lock effect and avoiding water block damage are crucial to the beneficial development;and(iii)without cores,the criteria can be roughly established to identify produced fluids in the light of physical properties and gas content,providing geological evidence for selecting the best perforation interval and water control.In conclusion,all above results offer references for the selection of targeted zones and intervals for subsequent development in Qingshimao gasfield.关键词
鄂尔多斯盆地/青石峁气田/复杂高含水气藏/储层物性/气水渗流/开发技术对策Key words
Ordos Basin/Qingshimao gasfield/Complex gas reservoir rich in water/Physical property/Gas-water seepage/Development strategy引用本文复制引用
王继平,张园园,韩兴刚,褚景文,陈璐瑶,胡勇,于占海,焦春艳..青石峁气田储层特征与气水渗流规律[J].天然气勘探与开发,2025,48(2):69-80,12.基金项目
中国石油天然气股份有限公司科技重大专项(编号:2023ZZ25-001)、中国石油长庆油田公司"揭榜挂帅"科技项目(编号:2022D-JB04). （编号:2023ZZ25-001）
