水基泥浆的侵入对声波测井曲线的影响及校正

The influence and correction of water base mud on acoustic logging

(中国石油大学（华东）地球资源与信息学院，山东东营 257061)

School of Earth Resources & Information, China University of Petroleum, Dongying 257061, China

采用水基泥浆钻井时,声波时差测井受井眼垮塌及泥岩蚀变的影响严重,使得声波测井资料有时难以真实准确地反映原状地层的信息，从而降低了声波时差的应用效果。根据Wylie物理模型原理分析了理想条件下水基泥浆对砂泥岩地层声波时差测井曲线的影响。对胜利油田孤东油区不同岩性地层电阻率与声波时差之间的关系进行了统计分析，结果表明，受水基泥浆影响严重的泥岩类地层，电阻率与声波时差之间具有良好的统计关系，可以用Faust公式对该类地层声波测井曲线进行校正。在此基础上，提出了针对不同岩性声波测井曲线的校正方法，并对研究区内多口井的声波测井曲线进行了环境校正。用校正后的声波测井资料制作的合成地震记录，与井旁实际地震道的相位、能量具有良好的对应关系。

It is serious influence that acoustic logging is affected by borehole slump and mudstone alteration while using water-base mud. The acoustic logging cannot be in accord with the true information of stratum, which debases the application. The influence of water-base mud invasion to acoustic logging of shaly sandstone stratum is analyzed in the ideal condition with the Wylie physical model. The result shows that mud influence is more serious to mudstone, and less to sandstone. The statistic relations between resistivity and acoustic logging are set up for different litholoical strata in the Gudong oil field, and the acoustic logging of mudstone is corrected by Faust equation. Then the correction method for different lithology is put forward. Several acoustic logging in the area were corrected by this method. The corrected information shows a good relationship on phase and energy between the synthesized seismic record and the practical seismic information of nearby the well.