多元回归方法校正扩径对密度曲线声波曲线的影响

测井曲线的质量易受井眼环境因素的影响,井径扩径段井壁凹凸不平、泥浆侵入、泥饼等容易造成曲线畸变失真,特别是探测深度较浅的密度和声波时差曲线。笔者利用曲线之间的内在关系,用多元回归分析的方法把畸变失真的曲线校正到了真实的测量范围。校正后曲线制作的合成地震记录与井旁地震道相关性较高,得到了满意的结果。该方法快速高效、易操作,为井震标定提供了高质量的数据。

THE APPLICATION OF MULTIPLE REGRESSION METHOD TO THE CALIBRATION OF THE INFLUENCE OF HOLE ENLARGEMENT ON DENSITY AND ACOUSTIC LOGS

Log tends to be influenced where borehole environmental condition is unfavorable.The uneven wall of a well,the intrusive mud and mud cake are likely to cause the curve distortion in the depth of well diameter expansion.Density and acoustic curves are most likely to be distorted because their geodesic depth is very shallow.In this paper,the numerical value of the distorted curves was corrected to real measurement range with the multiple regression analysis method and the internal relationship between curves.The correlation be-tween the synthetic seismic record based on the corrected curves and the seismic record near the well was relatively high,and the test results were satisfactory.This method is efficient and easily operable.It offers the high quality data for the calibration between the well and seism.