核磁共振谱形因子法识别水淹储层  

Interpretation of Water-Flooded Reservoirs Using the NMR Spectral Factor Method

作　　者：吴建华 刘行军 张海涛[2] 屈亚龙 王红发 王自亮 WU Jianhua;LIU Xingjun;ZHANG Haitao;QU Yalong;WANG Hongfa;WANG Ziliang(Changqing Division,China Petroleum Logging CO.LTD.,Xi’an,Shaanxi 710201,China;Exploration and Development Institute of PetroChina Changqing Oilfield Company,Xi’an,Shaanxi 710018,China)

机构地区：[1]中国石油集团测井有限公司长庆分公司,陕西西安710201 [2]长庆油田公司勘探开发研究院,陕西西安710018

出　　处：《测井技术》2020年第1期82-86,共5页Well Logging Technology

摘　　要：现有核磁共振测井解释方法常使用双水模型计算储层参数,计算中使用的地层水电导率,在水淹过程中受原状地层水、注入水矿化度及水淹程度等多种因素影响很难被准确获得,用该方法对水淹层进行解释并不适用。对鄂尔多斯盆地延长组地层岩心样品在实验室内进行油驱水和水驱油试验来模拟油层水淹过程,分析在该过程中岩心所对应核磁共振T2谱的变化特征,提出一种基于核磁共振谱形因子评价水淹储层的新方法。该方法通过数值模拟建立了核磁共振谱形因子与残余油饱和度方程,通过试验模型计算两者有较好的相关性与一致性,并在实际解释应用中取得较好效果。The existing NMR log interpretation method uses a dual-water model to calculate reservoir parameters.It is hard to get an accurate formation water conductivity,which is affected by original formation water conductivity,the salinity of injected water,flooded degree and other factors.Therefore,the existing NMR log interpretation method is not applicable to water-flooded layers.In this study,water-flooding-oil and oil-flooding-water experiments were carried out on the core samples of Yanchang formation in Ordos basin,then the NMR T2 spectra of the cores were analyzed,finally,a new method of using the NMR T2 spectral factor to interpret the water-flooded reservoir was proposed.Using the method,the equation of the NMR T2 spectral factor and residual oil saturation was established through numerical simulation.They are well correlated and consistent according to the experimental model.The method has achieved good results in practical interpretation.

关 键 词：测井解释 核磁共振谱形因子 水淹储层 水驱油 油驱水 双水模型 鄂尔多斯盆地 

分 类 号：P631.84[天文地球—地质矿产勘探]