XMAC纵波时差高分辨率处理方法

HIGH RESOLUTION PROCESSING OF P-WAVE SLOWNESS-TIME OF XMAC

在充分调研阵列声波测井分波提取方法的基础上,针对阿特拉斯公司的交叉多极子阵列声波测井(XMACⅡ)提供的单极波形信息,研究纵波时差提取及高分辨率处理方法。首先利用相关—互功谱法高精度地提取纵波时差,然后针对XMACⅡ仪器的接收阵列,研究组合子阵列的方法,形成共发射子阵列和共接收子阵列,最后利用子阵列对提取的纵波时差做高分辨率处理。处理现场实际测井资料,并将高分辨率处理成果与引进的eX-press软件处理成果、实测的国产高分辨率声波(纵波)测井曲线及岩心纵波时差对比分析,表明该方法提取的纵波时差曲线的纵向分辨率有很大提高,时差计算准确可靠,提取的单极纵波时差与国产高分辨率声波时差及岩心纵波时差的平均相对误差均小于7%。该方法具有较高的实用价值和广阔的应用前景。

In view of the monopole waveforms provided by Baker Atlas Cross-Multipole Array Acoustilog(XMACⅡ), extracting and high resolution processing methods of P-wave slowness-time are developed based on a thorough survey and study of wave division extraction methods of array acoustilog. First, P-wave slowness-time with high resolution is extracted by using correlation-cross power spectrum method. Then, the subarray arranging method is used to generate common-source subarray and common-receiver subarray from XMACⅡ's receiver array. Finally, the extracted subarrays are used to perform high resolution processing of P-wave slowness-time. Real field logging data are processed by using this technique and the processing results are compared with the processing results of the imported express software, the high-resolution acoustic (P-wave) log and core P-wave slowness-time measured with domestic tools. The vertical resolution of P-wave slowness-time curve extracted by using this method is greatly improved, the calculated slowness-time is accurate, and the average relative error of the extracted monopole P-wave slowness-time with the domestic high-resolution interval transit time and core P-wave slowness-time is lower than 7%. This technique has relatively high practical value and an extensive prospect of application.