摘要
裂缝发育程度是塔里木盆地超深层气藏高产及水侵主控因素,但针对不同气藏间裂缝发育模式划分及不同模式下水侵规律研究较少。为此,以塔里木盆地超深层气藏典型代表克深2、9、8气藏为主要研究对象,基于野外露头、岩心观察、成像测井、泥浆漏失、试井解释、生产动态等资料,结合水侵物理模拟实验及气藏开发实践验证,系统研究了不同气藏裂缝发育模式及水侵规律。结果表明:①克深2、9、8气藏分别发育方向型、过渡型、缝网型3种裂缝模式,裂缝发育程度、分布均匀性、连续性逐渐增高;②克深2、9、8气藏主要发育EW向高角度构造裂缝,裂缝规模、有效性、物性、无阻流量、泥浆漏失量等裂缝定量表征静动态参数均值及其井间差异程度依次增高;③气水分布主要受裂缝发育模式控制,克深2、9、8气藏气水分异程度逐渐增高,分别对应厚气水过渡带、薄气水过渡带、正常气水分异3种气水分布模式;④裂缝发育模式决定水侵速度和采收率,方向型克深2气藏非均匀水侵速度快,物理模拟水驱气效率低,气藏最终采收率低,缝网型克深8气藏水侵规律反之,过渡型克深9气藏表现居中。研究成果可为气藏全生命周期控水开发提高采收率技术的形成提供理论模型和地质指导。
The degree of fracture development is the main controlling factor for high production and water invasion of ultra-deep gas reservoir in Tarim Basin,but there are few studies on the division of fracture development model among different gas reservoirs and its effect on static gas-water distribution and dynamic water invasion.Taking Keshen 2,9 and 8 gas reservoirs as examples,the typical ultra-deep gas reservoirs in Tarim Basin,as the main research object,based on the outcrop,core,FMI,mud loss,well test interpretation and production data,combined with water invasion physical simulation experiment and gas reservoir development practice verification,the gas-water distribution and water invasion law of gas reservoirs under different fracture development models are systematically studied.The results show:(1)Three fracture models are developed in Keshen 2,9 and 8 gas reservoirs,namely direction type,transition type and fracture network type,respectively.The fracture occurrence of each gas reservoir is basically the same,and the mean values of static and dynamic parameters of fracture quantitative characterization,such as fracture size,effectiveness,physical property,open flow rate and mud loss amount,as well as the degree of difference between wells increase successively.(2)The gas-water distribution is mainly controlled by fracture development model,and the gas-water differentiation degree increases gradually in Keshen 2,9 and 8 gas reservoirs,corresponding to three gas-water distribution models of thick gaswater transition zone,thin gas-water transition zone and normal gas-water differentiation respectively.(3)The fracture development model determines the water invasion rate and recovery factor.The non-uniform water invasion rate of Keshen 2 gas reservoir is fast,and the water flooding efficiency of the physical simulation is low,and the ultimate recovery factor of gas reservoir is low.The water invasion law of Keshen 8 gas reservoir is opposite,and Keshen 9 gas reservoir is in the middle.The research results can provide theoretical model and geological guidance for the formation of water control development and EGR technology in gas reservoir life cycle.
作者
刘群明
唐海发
吕志凯
王琦峰
刘兆龙
常宝华
LIU Qunming;TANG Haifa;LÜ Zhikai;WANG Qifeng;LIU Zhaolong;CHANG Baohua(Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China)
出处
《天然气地球科学》
CAS
CSCD
北大核心
2023年第6期963-972,共10页
Natural Gas Geoscience
基金
中国石油天然气股份有限公司“十四五”前瞻性基础性科技攻关项目下属课题“深层/超深层气藏控水提高采收率技术研究”(编号:2021DJ1005)资助.
关键词
超深层气藏
克拉苏构造带
裂缝发育模式
定量表征
气水分布
物理模拟
水侵规律
Ultra-deep gas reservoir
Kelasu tectonic belt
Fracture development model
Quantitative characterization
Gas-water distribution
Physical simulation
Water invasion law
