老油田浅层声波曲线的预处理与重构技术

The pre-processing and reconstruction technique for shallow layer acoustic curve in old oil-field

由于测井资料采集时间及使用的测井仪器的不同,我国许多老油田浅层声波时差测井曲线往往存在刻度不统一、测量值不反映实际地层情况、无法区分砂、泥岩等问题,同时因声波测井方法与地震方法的差异,导致地震波阻抗反演结果预测薄层砂体能力的下降。为此,本文总结了一套包括声波井径校正、标准化处理、速度校正的预处理技术,以深侧向电阻率为参考曲线,对预处理声波曲线进行了重构。对港东一区一断块的实际应用结果表明,利用声波曲线预处理后制作的合成记录与井旁道相关性明显提高,预处理曲线重构后反演结果分辨砂、泥岩的能力显著增强,且与钻井结果相吻合。

Due to different acquisition time and different types of logging instrument used in well logging data acquisition,some problems,such as inconsistent calibrations,measured values not reflecting the real conditions for the strata,failing to resolve sand and shale,the difference between acoustic logging method and seismic method and so on exist in the acoustic logging curves for the shallow layers in old oil-fields,the problems above then cause poor results for prediction of thin layer sand bodies by using seismic impedance inversion method.In order to solve the problems a set of pre-processing technique including acoustic caliper correction,standardization processing,and velocity correction was summarized to reconstruct the acoustic logging curves by taking deep lateral resistivity as reference curve.The application results for the reconstructed curves in a block of Gang East area demonstrated that the correlationship between the borehole-side seismic traces and the synthetic records which were made by using reconstructed acoustic logging curves were obviously increased,the ability for the inversion results to resolve sand and shale was greatly raised,which matched the drilling results very well.