白云岩声电各向异性实验测量及分析

Experimental measurement and analysis of the acoustic-electrical anisotropy of dolomites

四川盆地高石—磨溪地区灯影组白云岩各向异性强,导致该地区水平井与直井测量的声波和电阻率曲线差异大,测井响应规律解释不清,影响水平井技术在实际储层中的应用效果。本文以高石—磨溪地区野外露头白云岩为实验对象,设计并开展高温高压下岩心不同方向电阻率和声波同步测量实验,分析声各向异性系数与电各向异性系数实验关系。实验结果表明在60℃和60MPa下,电各向异性系数与声各向异性系数呈正相关线性关系;随着含水饱和度的上升,纵波速度上升,电阻率下降,声电各向异性系数均上升。该实验结果为声电各向异性的相关性分析和声波、电阻率差异校正提供实验依据。

The dolomites in the Dengying Formation in the Gaoshi-Moxi area,Sichuan Basin have strong anisotropy,causing great differences in acoustic and resistivity curves measured at horizontal and vertical wells and unclear interpretation of logging response rules,thus affecting the application performance of the horizontal well technique in actual reservoirs.With the dolomite outcrops in the Gaoshi-Moxi area as a case study,this study designed and conducted the synchronous measurement experiments of resistivity and acoustic waves of cores in different directions under high-temperature and high-pressure conditions and analyzed the experimental relationship between acoustic and electrical anisotropy coefficients.The experimental results show that there was a positive linear correlation between the two coefficients at 60℃and 60 MPa.Specifically,with an increase in water saturation,the compressional wave velocity increased,the resistivity decreased,and acoustic and electrical anisotropy coefficients increased.This result provides an experimental basis for the correlation analysis of acoustic-electrical anisotropy and the correction of the differences in the acoustic waves and resistivity.