台南气田脉冲中子-中子测井解释方法及应用  

Pulsed Neutron-Neutron Plus Log Interpretation Method and Its Application in Tainan Gas Field

作　　者：沈付建 罗娜 郑华 张雨桐 汪海文 何晓君 SHEN Fujian;LUO Na;ZHENG Hua;ZHANG Yutong;WANG Haiwen;HE Xiaojun(Logging and Testing Services Company,CNPC Daqing Oilfield,Daqing,Heilongjiang 163453,China;Research Institute of Exploration and Development,PetroChina Qinghai Oilfield Company,Dunhuang,Gansu 736202,China)

机构地区：[1]中国石油大庆油田有限责任公司测试技术服务分公司,黑龙江大庆163453 [2]中国石油青海油田公司勘探开发研究院,甘肃敦煌736202

出　　处：《测井技术》2024年第1期101-109,共9页Well Logging Technology

基　　金：中国石油天然气股份有限公司油气和新能源分公司科技项目“钻完井关键技术研究与现场试验”(kt-2021-13)。

摘　　要：为评价水侵后台南气田的储层水淹状况,在套管井中规模应用脉冲中子-中子测井技术。研究井筒内积液、水淹层放射性增强、套管尺寸变化等影响因素对脉冲中子-中子测井曲线的影响及其校正方法,形成基于逐步剥离法和SIGMA—RATGN交会图法的储层饱和度定量解释方法。依据驱油效率、含水饱和度、校正后的热中子俘获截面值,建立台南气田气层水淹级别评价标准。新方法有效提高气层识别准确性和储层饱和度解释精度,水淹层评价符合率达92.3%,为台南气田稳产提供技术支持。The pulsed neutron-neutron plus logging is applied in cased wells in Tainan gas field to evaluate the water flooding status of the reservoir after water invasion.The effects of main influencing factors such as fluid accumulation in the wellbore,enhanced radioactivity in the flooded zone,and changes in casing size on pulsed neutron-neutron plus logging curves are investigated and correction methods are proposed.A set of quantitative interpretation method of reservoir saturation has been formed based on a stepwise stripping method and SIGMA-RATGN crossplot method.The evaluation criteria of water flooding levels of gas reservoir in Tainan gas field is established further more according to the oil displacement efficiency,water saturation and corrected thermal neutron capture section value.The new method effectively improves the accuracy of gas reservoir identification and reservoir saturation interpretation,and the coincidence rate of water flooding level evaluation reaches 92.3%,providing technical support for stable production of Tainan gas field.

关 键 词：台南气田 脉冲中子-中子测井 水淹层 饱和度 解释模型 储层评价 

分 类 号：P631.84[天文地球—地质矿产勘探]