天然气勘探与开发2026，Vol.49Issue(1)：63-70,8.DOI:10.12055/gaskk.issn.1673-3177.2026.01.006
库车山前超深裂缝性致密砂岩边水气藏试井特征分析
Well test characteristic analysis of ultra-deep fractured tight sandstone edge-water gas reservoirs in the Kuqa piedmont
摘要
Abstract
The gas fields in the Kuqa piedmont of the Tarim Basin consist of a series ultra-deep fractured tight sandstone edge-water gas reservoirs,featuring multi-scale discrete fractures including matrix-fracture-fault systems,which pose great challenges to well test interpretation.Based on actual test data and the basic principles of well test interpretation,this paper systematically analyzes the characteristics of well test type curves for fractured water-bearing gas reservoirs in the Kuqa piedmont.Results show that:(i)for edge gas wells,the late-stage upward warping of the pressure derivative may be a false boundary formed by the viscosity difference between gas and water,and the pressure derivative curve generally shrinks to the upper left in the log-log plot with the gradual advancement of water;(ii)the late-stage pressure derivative presents a straight line with a slope between 0.5 and 1 for gas wells at high structural positions.The slope value reflects the development degree of fracture networks.The more complex the fracture network,the larger the slope.The slope of the pressure derivative curve changes before and after water breakthrough in the wells at high structural positions,and resumes to the original state after complete water flooding;(iii)comparison of well test pressure derivative curves normalized using production data of a single well at different stages indicates no significant change in formation coefficient without edge water influence;(iv)there exists gas supply from matrix to fracture system.To sum up,for the fractured gas reservoirs with tight matrix in the field group in the Kuqa piedmont,their key parameters such as permeability and storativity ratio cannot be interpreted using analytical well test methods when the total system radial flow does not appear on the derivative curve.The late-stage upward warping of the pressure derivative curves for gas wells at edge is not necessarily a boundary characteristic,and this phenomenon should be analyzed combining dynamic and static data.During the development process,the reservoir permeability does not show obvious stress sensitivity characteristics.关键词
塔里木盆地/超深层/裂缝性边水气藏/试井曲线/渗透率/储容比/应力敏感Key words
Tarim Basin/Ultra-deep fractured edge-water gas reservoir/Well test type curve/Permeability/Storativity ratio/Stress sensitivity分类
能源科技引用本文复制引用
孙贺东,朱松柏,唐永亮,王小培,闫炳旭,雷享和,魏鹏..库车山前超深裂缝性致密砂岩边水气藏试井特征分析[J].天然气勘探与开发,2026,49(1):63-70,8.基金项目
中国石油天然气集团有限公司科研项目"海相碳酸盐岩油气规模增储上产与勘探开发技术研究——超深断控碳酸盐岩油藏效益开发与提高采收率研究"(编号:2023ZZ16YJ02). （编号:2023ZZ16YJ02）
