天然气勘探与开发2025，Vol.48Issue(5)：1-13,13.DOI:10.12055/gaskk.issn.1673-3177.2025.05.001
强非均质性、超高压、薄储层气藏高产主控因素量化评价
Quantitative evaluation of key controlling factors for high gas production from highly heterogeneous,ultra-high pressure,and thin reservoirs:A case study of Qixia Formation in Anyue gas field,central Sichuan Basin
摘要
Abstract
To achieve efficient development and clarify key controlling factors on gas recovery from the highly heterogeneous,ultra-high pressure,and thin reservoirs of the Middle Permian Qixia Formation in the Gaoshiti-Moxi block of Anyue gas field,central Sichuan Basin,the thin reservoirs(average thickness<10 m)of Qixia Formation in this area were evaluated for well productivity by integrating geologic and engineering factors,and the key controlling factors of well productivity were quantified.Results show that,(i)the reservoirs of Qixia Formation are mainly composed of grain shoal-dominated dolomite,and high-production wells are distributed in grain shoal plays with the shoal-formation ratio(SFR)˃0.3;(ii)the higher the degree of dolomitization,the better the reservoir properties;the reservoir permeability can exceed 0.1 mD when the degree of dolomitization exceeds 60%;(iii)the presence of fracture improves the physical properties of shoal facies dolomite reservoirs,and high-production wells are realized within 1.0 km to the sides of faults;(iv)the well productivity is positively correlated with the high-quality reservoir thickness,and the vertical thickness of high-quality reservoirs for high-production wells is greater than 3 m;(v)the ultra-high pressure reservoirs exhibit the original gas in place(OGIP)of 42%higher and the absolute open flow potential(AOFP)of a gas well 2 times higher than normal-pressure reservoirs;(vi)the application of horizontal well with horizontal section length of 1 000-1 200 m helps to achieve optimal recovery from the reservoirs in the study area.It is concluded that the high gas recovery from the reservoirs in this area can be attributed to the following controlling factors:favorable sedimentary facies(a fundamental factor),degree of dolomitization(a critical factor),thickness of high-quality reservoir(an essential factor),fracture-enhanced dolomite reservoirs(a recovery assurance),ultra-high pressure retention(an energy carrier),and application of horizontal well(a technical guarantee).关键词
四川盆地川中地区/安岳气田/二叠系中统栖霞组/薄层白云岩储层/超高压气藏/高产主控因素/定量化评价Key words
Central Sichuan Basin/Anyue gas field/Middle Permian Qixia Formation/Thin dolomite reservoir/Ultra-high pressure reservoir/Key controlling factors for high production/Quantitative evaluation分类
能源科技引用本文复制引用
徐会林,罗文军,邓惠,杨东凡,鲁杰,周芳芳..强非均质性、超高压、薄储层气藏高产主控因素量化评价[J].天然气勘探与开发,2025,48(5):1-13,13.基金项目
四川省自然科学基金项目"超高压特低孔强非均质碳酸盐岩气藏有效储层物性下限研究"(编号:2023NSFSC0261),中国石油西南油气田公司科研项目"川中古隆起碳酸盐岩气藏效益开发技术研究"(编号:2024D103-04). （编号:2023NSFSC0261）
