大庆油田X7地区低孔渗储层核磁共振测井可变T_(2)截止值确定方法  

Determination Method of Variable T_(2)Cutoff Value in NMR Logging of Low Permeability Reservoir in Daqing Oilfield X7 Area

作　　者：李鹏举[1,2] 陈冲航 徐若谷 刘硕 沈忠山 付艳 LI Pengju;CHEN Chonghang;XU Ruogu;LIU Shuo;SHEN Zhongshan;FU Yan(School of Earth Science,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;Accumulation&Development of Unconventional Oil&Gas,State Key Laboratory Cultivation Base Jointly-Constructed by Heilongjiang Province&Ministry of Science&Technology,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;NO.4 Production Plant,CNPC Daqing Oilfield,Daqing,Heilongjiang 163000,China)

机构地区：[1]东北石油大学地球科学学院,黑龙江大庆163318 [2]东北石油大学非常规油气成藏与开发省部共建国家重点实验室培育基地,黑龙江大庆163318 [3]中国石油大庆油田第四采油厂,黑龙江大庆163000

出　　处：《测井技术》2024年第3期355-362,共8页Well Logging Technology

基　　金：中国科学院声学所声场声信息国家重点实验室开放课题“老化油超声破乳的声学机理研究”(SKLA202412)。

摘　　要：T_(2)截止值是计算核磁共振测井束缚水孔隙度、可动流体孔隙度和渗透率的关键参数。在岩心压汞资料与核磁共振测井资料的基础上,提出连续计算低孔隙度低渗透率(低孔渗)储层核磁共振测井T_(2)截止值的方法。用岩心对应深度的核磁共振测井T_(2)谱代替核磁共振实验T_(2)谱,用岩心压汞资料中的渗透率贡献确定束缚水所对应的进汞饱和度,此时剩余汞饱和度即为束缚水饱和度,结合T_(2)谱,通过插值算法得出岩心的T_(2)截止值;分析多块岩心T_(2)截止值在T_(2)谱上的分布规律,从而建立根据T_(2)谱形态连续计算可变T_(2)截止值的方法。在X7地区应用此方法实现核磁共振测井连续T_(2)截止值的计算,用计算出的T_(2)截止值进行孔隙度和渗透率等储层参数计算,明显提升了储层参数计算的精度。T_(2)cutoff value is a key parameter for calculating bound fluid porosity,mobile fluid porosity and permeability in NMR logging.On the basis of existing core mercury injection data and NMR logging data,a method for continuously calculating T_(2)cutoff value of NMR logging in low porosity and permeability reservoir is proposed.Firstly,T_(2)spectrum of nuclear magnetic logging at the corresponding depth of the core is replaced by T_(2)spectrum of the nuclear magnetic experiment.The permeability contribution in the mercury injection data of the core is used to determine the mercury input saturation corresponding to the bound water,and the remaining mercury saturation at this time is the bound water saturation.The combined with T_(2)spectrum,the T_(2)cutoff value of the core is obtained by interpolation algorithm.Finally the distribution of T_(2)cutoff values in the T_(2)spectrum of multiple cores is analyzed,and a method for continuously calculating the variable T_(2)cutoff values is established according to the T_(2)spectrum morphology.This method is applied to the continuous T_(2)cutoff value calculation of NMR logging in X7 area,and the calculated T_(2)cutoff value is used to calculate reservoir parameters such as porosity and permeability,which significantly improves the calculation accuracy of reservoir parameters.

关 键 词：核磁共振测井 可变T_(2)截止值 低孔隙度低渗透率储层 束缚水孔隙度 大庆油田 

分 类 号：P631.84[天文地球—地质矿产勘探]