超深油气井核磁共振测井影响分析及谱形态校正  

Influence Analysis and Spectral Shape Correction of Nuclear Magnetic Logging in Ultra-Deep Oil and Gas Wells

作　　者：陈国军[1] 张啸[1] 高明[1] 张帆[1] 张进[1] 范小秦[1] CHEN Guojun;ZHANG Xiao;GAO Ming;ZHANG Fan;ZHANG Jin;FAN Xiaoqin(Geophycial Research Institute of Research Institute of Exploration and Development of Xinjiang Oilfield Company,Urumqi,Xinjiang 830013,China)

机构地区：[1]新疆油田公司勘探开发研究院地球物理研究所,新疆乌鲁木齐830013

出　　处：《测井技术》2023年第4期457-461,共5页Well Logging Technology

基　　金：中国石油天然气集团有限公司重大专项“页岩油测井关键技术研究与应用”(2019E-2603)。

摘　　要：准噶尔盆地超深井使用油基钻井液钻井,但侵入地层的油基钻井液影响了核磁共振测井的物理响应特征,使其无法真实地反映地层的孔隙结构。通过高温岩心核磁共振实验,发现油基钻井液侵入后束缚峰降低、可动峰增大,钻井液侵入前、后总孔隙度变化不大。通过实验参数分析,将储层分为3类建立校正模型。应用结果表明,校正后的T_(2)谱能更真实地反映孔隙结构特征,计算前可动孔隙度与计算后可动孔隙度相比,其平均相对误差从25%下降到7%,有效提高可动孔隙度的解释精度。该研究为准噶尔盆地南缘地区勘探部署提供测井技术支撑。The ultra-deep wells in Junggar basin are drilled with oil-based mud.The oil-based mud intruded into the formation affects the physical response characteristics of nuclear magnetic logging,and can not truly reflect the pore structure of the formation.Through the high temperature core nuclear magnetic resonance experiment,it is found that the bound peak decreases and the movable peak increases after the invasion of oil-based mud,but the total pore changes little before and after the invasion.Through the experimental parameters,the reservoir is divided into three types to establish a correction model.The application results show that the corrected T_(2) spectrum can more truly reflect the pore structure characteristics,and the average relative error of the mobile porosity before calculation is reduced from 25%to 7%compared with the mobile porosity after calculation,effectively improving the interpretation accuracy of the mobile porosity.This study provides logging technology support for the next exploration deployment in the southern margin of the Junggar basin.

关 键 词：解释评价 油基钻井液 核磁共振测井 响应机理 谱形态校正 准噶尔盆地 

分 类 号：P631.84[天文地球—地质矿产勘探]