核磁共振饱和度指数及其在储层流体饱和度计算中的应用  

NMR saturation index and its application to fluid saturation estimation

作　　者：葛新民[1,2,3] 曾炳丁 李楠 徐红军 刘海涛[6] 顾定娜 孙万明 范宜仁 GE Xinmin;ZENG Bingding;LI Nan;XU Hongjun;LIU Haitao;GU Dingna;SUN Wanming;FAN Yiren(School of Geosciences in China University of Petroleum(East China),Qingdao 266580,China;Key Laboratory of Seabed Mineral Resources,Ministry of Natural Resources,Guangzhou 510075,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China;Technology Center,China Petroleum Logging Company Limited,Xi an 710077,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China;Tuha Branch,China Petroleum Logging Company Limited,Hami 839009,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]自然资源部海底矿产资源重点实验室,广东广州510075 [3]海洋国家实验室海洋矿产资源评价与探测功能实验室,山东青岛266071 [4]中国石油集团测井有限公司技术中心,陕西西安710077 [5]中国石油勘探开发研究院,北京100083 [6]中国石油集团测井有限公司吐哈分公司,新疆哈密839009

出　　处：《中国石油大学学报（自然科学版）》2021年第5期64-72,共9页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：自然资源部海底矿产资源重点实验室基金项目(KLMMR-2018-B-03);国家自然科学基金面上项目(42174142);青岛海洋国家实验室海洋矿产资源评价与探测技术功能实验室自主课题(MMRZZ201805);中央高校基本科研业务费专项(19CX02006A);中国石油天然气股份有限公司科技重大专项(2017E-04-12);国家科技重大专项(2017ZX05039-002,2017ZX05072-002)。

摘　　要：基于油-水、气-水和水合物-水等两相流体的岩心核磁共振试验,分析流体饱和度对核磁共振T 2谱的影响,从测井应用角度考虑提出核磁共振弛豫指数的概念,参考阿尔奇公式建立含水饱和度与核磁共振弛豫指数的经验关系,拟合得到核磁共振饱和度系数和核磁共振饱和度指数,并探讨核磁共振饱和度指数的变化特征及影响因素。结果表明:当岩石孔隙中含有两相流体时,含水饱和度核磁共振弛豫指数呈现明显的幂指数关系,核磁共振饱和度系数基本稳定在1左右,但核磁共振饱和度指数分布范围较广,与岩石粒径、流体性质、孔隙结构等密切相关,通过试验建立的经验关系计算得到的含水饱和度与实际测量的含水饱和度吻合度高,一致性好。Based on laboratory core nuclear magnetic resonance(NMR)measurements of two-phase fluids such as oil-water,gas-water and gas hydrate-water,the influence of fluid saturation on the transversal relaxation time(T 2)spectrum was analyzed.The definition of the NMR relaxation index was proposed from the perspective of the application of NMR logging data.Similar to the well-known Archie s equation,the empirical relationship between the water saturation and the NMR relaxation index is established,and the characteristics and influencing factors of NMR saturation index are discussed.The results show that the water saturation is exponential with the NMR relaxation index and can be fitted by the exponential function.In additional,the NMR saturation coefficient is distributed around 1,but the NMR saturation index has a wide distribution range,which is influenced by many factors such as grain size,fluid property,as well as pore structure.The predicted water saturation generally agrees with the experimental data,revealing the accuracy of the proposed model.It is suggested that laboratory NMR experiments with different fluid saturations should be carried out according to specific geological units for a better recognition of the reservoir s NMR logging response,and for the empirical NMR interpretation models.

关 键 词：岩心核磁共振 仿阿尔奇公式 两相流体 核磁共振弛豫指数 核磁共振饱和度指数 饱和度解释模型 

分 类 号：P631[天文地球—地质矿产勘探]