快速孔渗核磁共振测井模式设计  

Designing a NMR Logging Model for Fast Estimation of Porosity and Permeability

作　　者：姜志敏[1] 党煜蒲 薛志波[1] 张嘉伟[1] JIANG Zhimin;DANG Yupu;XUE Zhibo;ZHANG Jiawei(China Oilfield Services Limited, Beijing 101149, China)

机构地区：[1]中海油田服务股份有限公司,北京101149

出　　处：《测井技术》2020年第2期129-134,共6页Well Logging Technology

基　　金：国家重大科技专项(2017ZX05019003-002)。

摘　　要：为增强现有核磁共振测井仪器的纵向分辨率、提高测井速度,在常规CPMG测量序列的基础上,提出改进型FCPMG序列。对该序列的理论分析和工程软件建模仿真得出,在2 MHz的核磁共振岩心分析系统上进行测试实验,结果与理论仿真完全吻合。首次提出采用该序列高分辨率快速测量孔渗模型。通过饱和水的岩心测试分析,得出孔隙模式下,该测量模式能够快速测量,获得高精度、高纵向分辨率的测量结果。An updated FCPMG sequence is proposed on the basis of the conventional CPMG sequence,which can enhance the vertical resolution of a NMR logging tool and increase logging speed.Theoretical analysis is fully consistent with software-modeled simulation through 2 MHz experiments on a nuclear magnetic core system.Meanwhile,proposes a fast and high-resolution model of porosity and permeability using this improved sequence for the first time.Tests on water-saturated cores have proved porosity and permeability can be obtained with high precision and high vertical resolution using the model.

关 键 词：核磁共振测井 高分辨率 孔渗模式 测井速度 弛豫时间谱 

分 类 号：P631.8[天文地球—地质矿产勘探]