【作者】 赵培强； 石玉江； 王大兴； 李卫兵； 毛志强；

【Author】 ZHAOPeiQiang;SHI Yujiang;WANG DaXing;LI WeiBing;MAO ZhiQiang;College of Geophysics,China University of Petroleum;Research Institute of Exploration and Development,PetroChina Changqing Oilfield Company;

【机构】 中国石油大学(北京)地球物理学院； 长庆油田勘探开发研究院；

【摘要】 本文基于介电测井四种频率的复介电常数,提出一种介电测井反演致密砂岩储层含油饱和度的方法。首先,选用响应方程组构建目标方程,1 GHz测量的介电常数和电导率使用复折射率模型,20MHz～500MHz频段的介电常数和电导率采用泥质砂岩响应模型。然后,利用粒子群优化算法对目标方程进行寻优反演。最后,将该方法运用至目标储层,获得饱和度、水相曲折度指数、冲洗带矿化度以及泥质频散项体积含量。结果显示理论测井响应曲线和实际测井曲线的相对误差小于10%,表明本方法反演的参数结果有效、可靠。更多还原

【Abstract】 Based on the complex dielectric constant of four frequencies of dielectric logging,an inversion method of oil saturation in tight sandstone by dielectric dispersion logs is proposed.First of all,response equations are selected to construct the target equation.CRIM model is used for permittivity and conductivity measured at 1 GHz,and Shaly sandstone model(SHSD) is used for permittivity and conductivity in 20～500 MHz frequency band.Then,the particle swarm optimization(PSO) algorithm is used to optimize the objective equation.Finally,the method is applied to the target reservoir to obtain saturation,tortuosity index of water phase,salinity of flushing zone and volume content of shale dispersive phase.The results show that the relative error between the theoretical log response and the measured log is less than 10%,which indicates that the inversion parameters of this method are effective and reliable.更多还原