岩屑核磁共振录井的适用性探讨  

Discussion on applicability of cuttings NMR logging

作　　者：刘达贵 冯雪 童川 杨紫彦 杨琳 陈雷 LIU Dagui;FENG Xue;TONG Chuan;YANG Ziyan;YANG Lin;CHEN Lei(Geological Exploration&Development Research Institute,CNPC Chuanqing Drilling Engineering Company Limited,Chengdu,Sichuan 610051,China)

机构地区：[1]中国石油川庆钻探工程有限公司地质勘探开发研究院

出　　处：《录井工程》2024年第2期22-27,共6页Mud Logging Engineering

基　　金：中国石油川庆钻探工程有限公司地质勘探开发研究院2022年科研计划项目“川渝地区油基钻井液条件下录井流体性质快速判别方法研究”(编号:CQ2022B-F-5-1)。

摘　　要：为了使核磁共振录井技术在油气田勘探开发中发挥更大的作用,以四川盆地致密砂岩为研究对象,探讨岩屑核磁共振录井的适用性。分析了相同层段、不同颗粒直径的岩屑核磁共振孔隙度和渗透率,建立了岩屑核磁共振孔隙度与岩心实验室测定孔隙度、岩屑核磁共振渗透率与岩心实验室测定渗透率的数学模型。研究结果表明:同一柱塞岩心样品,核磁共振孔隙度与岩心实验室测定孔隙度、核磁共振渗透率与岩心实验室测定渗透率相关系数r值分别为0.99、0.86;相同层段、不同颗粒直径的岩屑,核磁共振孔隙度与岩心实验室测定孔隙度、核磁共振渗透率与岩心实验室测定渗透率对比,随着岩屑颗粒直径变小,相关系数r值均减小,相关性变差;岩屑颗粒直径不小于3 mm时,核磁共振孔隙度与岩心实验室测定孔隙度相关系数r值均不小于0.90,核磁共振渗透率与岩心实验室测定渗透率相关系数r值均不小于0.73。这表明录井现场PDC钻头岩屑颗粒直径也能够满足核磁共振录井技术的应用。In order to make NMR logging technology play a more important role in oil⁃gas field exploration and development,the applicability of the cuttings NMR logging was discussed by taking the tight sandstones of Sichuan Basin as the object of study.The NMR porosity and permeability of rock cuttings with the same interval and different particle diameters were analyzed.The mathematical models of cuttings NMR porosity and core lab determining porosity,cuttings NMR permeability and core lab determining permeability were established.The study shows that for the same plunger core sample,the correlation coefficients(r values)of NMR porosity and core lab determining porosity,NMR permeability and core lab determining permeability are 0.99 and 0.86,respectively.For rock cuttings with the same interval and different particle diameters,NMR porosities and core lab determining porosities,NMR permeabilities and core lab determining permeabilities are compared.As the particle diameters of rock cuttings decrease,the correlation coefficients(r values)decrease and the correlations become worse.For the particle diameters of rock cuttings are not less than 3 mm,the correlation coefficients(r values)between NMR porosities and core lab determining porosities are not less than 0.90,the correlation coefficient(r values)between NMR permeabilities and core lab determining permeabilities are not less than 0.73.The results show that the particle diameters of PDC bit cuttings in mud logging site can also meet the application of NMR logging technology.

关 键 词：岩屑核磁共振录井 岩心实验数据 孔隙度 渗透率 相关性 

分 类 号：TE132.1[石油与天然气工程—油气勘探]