| 基于核磁共振双截止值的致密砂岩渗透率评价新方法 |
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| 引用本文： | 范宜仁,刘建宇,葛新民,邓少贵,刘洪亮,顾定娜.基于核磁共振双截止值的致密砂岩渗透率评价新方法[J].地球物理学报,2018,61(4):1628-1638. |
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| 作者姓名： | 范宜仁 刘建宇 葛新民 邓少贵 刘洪亮 顾定娜 |
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| 作者单位： | 1. 中国石油大学(华东)地球科学与技术学院, 山东青岛 266580;2. 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, 山东青岛 266071;3. 中国石油测井有限公司吐哈事业部, 新疆哈密 838202 |
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| 基金项目： | 国家重大科学仪器设备开发专项（2013YQ170463），山东省自然科学基金（ZR2014DQ007）和中央高校基本科研业务费专项资金（16CX05004A、16CX06048A和18CX06025A）资助. |
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| 摘 要： | 对比分析致密砂岩岩心在完全含水状态和束缚水状态下的核磁共振T2谱，明确了致密砂岩孔隙中流体的赋存状态和渗流规律，指出常规核磁共振方法预测渗透率的局限性并提出核磁共振双截止值的概念.基于核磁共振双截止值，将储集空间细分为完全可动、完全束缚、部分可动等三部分，分析不同孔隙组分对渗透率的影响，并应用三组分法建立了核磁共振渗透率表征新模型.研究表明：致密砂岩渗透率与完全可动流体饱和度、部分可动流体T2几何平均值、核磁孔隙度成正比，与完全束缚流体饱和度成反比.在此基础上，结合完全含水核磁共振T2谱的二阶差分得到了双截止值的自适应确定方法，可以连续地计算储层双截止值.将该研究成果应用于生产实践，渗透率计算精度有较大的提高.
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| 关 键 词： | 致密砂岩 核磁共振 渗透率 双截止值 特征参数 |
| 收稿时间： | 2017-01-16 |
Permeability evaluation of tight sandstone based on dual T2 cutoff values measured by NMR |
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| FAN YiRen,LIU JianYu,GE XinMin,DENG ShaoGui,LIU HongLiang,GU DingNa.Permeability evaluation of tight sandstone based on dual T2 cutoff values measured by NMR[J].Chinese Journal of Geophysics,2018,61(4):1628-1638. |
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| Authors: | FAN YiRen LIU JianYu GE XinMin DENG ShaoGui LIU HongLiang GU DingNa |
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| Institution: | 1. School of Geosciences, China University of Petroleum(East China), Shandong Qingdao 266580, China;2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Shandong Qingdao 266071, China;3. Tuha Division of China Petroleum Logging Company Limited, Xinjiang Hami 838202, China |
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| Abstract: | Based on the comparative analysis of the T2 spectrum of tight sandstone in the fully saturated state and the bound water saturated state, the storage mechanism and the seepage law of fluid in tight sandstone are clarified, the limitations of conventional NMR methods for predicting permeability are pointed out and the concept of double cutoff values by NMR is proposed. According to this concept, the reservoir space is segregated into three parts, i.e. the absolute immovable pore, the absolute movable pore and partially movable pore. We perform univariate analysis to characterize the effects of different pore components on permeability, and establish a new model of NMR permeability. The results show that the permeability is negatively correlated with the absolute irreducible fluid saturation, while positively correlated with the absolute movable fluid saturation, NMR porosity and the geometrical T2 value of partial movable fluid component. On this basis, a self-adaptive method of determining dual T2 cutoff values is shaped by combining the second order difference of the T2 spectrum, which permits to calculate the dual cutoff values continuously. These research results have been applied to production, greatly enhaning the accuracy of permeability calculation. |
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| Keywords: | Tight sandstone Nuclear magnetic resonance Permeability Dual T2 cutoff value Characteristic parameter |
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