深探测阵列声波测井高分辨率反射波提取及成像  

High-Resolution Reflected Wave Extraction and Imaging Enhancement for Array Acoustic Logging

作　　者：岳文正[1] 刘东明 田斌[3] 秦民君 YUE Wenzheng;LIU Dongming;TIAN Bin;QIN Minjun(National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China;Changqing Branch,China National Logging Corporation,Xi'an,Shaanxi 710201,China;Shenyang Oil Production Plant,PetroChina Liaohe Oilfield Company,Xinmin,Liaoning 110316,China)

机构地区：[1]油气资源与工程全国重点实验室,中国石油大学(北京),北京102249 [2]中国石油集团测井有限公司长庆分公司,陕西西安710201 [3]中国石油辽河油田公司沈阳采油厂,辽宁新民110316

出　　处：《测井技术》2024年第6期731-740,共10页Well Logging Technology

基　　金：国家自然科学基金“基于页岩X-ray CT数字岩心的电学参数渗透率计算模型数值模拟研究”(42174129);北京市自然科学基金“基于数字岩心地下水污染物扩散微观渗流机理研究”(8192038)。

摘　　要：基于阵列声波测井的反射波成像是远离井眼进行井周地质结构和特性探测的重要技术,其中,从测井波形中提取反射波是该方法的关键部分,但是实现有效和高分辨率的反射波与模式波分离是相当困难的。针对这个问题,介绍了一种基于剪切波变换的反射波提取和噪声压制图像增强方法。该方法将剪切波变换与二维傅里叶变换相结合,利用剪切波变换的多尺度和多方位分解能力对阵列声波测井信号进行处理,可以发现模式波在剪切波域中聚焦在较小尺度上的水平锥形区域,由此,通过选择硬阈值将模式波与反射波信号分离,进而识别声波测井信号中的不同分量,压制噪声干扰,实现高分辨率反射波提取,提高反射波成像的质量和清晰度。利用该方法处理了正演模拟数据,并与其他方法的处理结果进行对比,验证了所提方法的有效性和准确性。最后,现场数据结果进一步证实了该方法的正确性。该方法在缝洞型碳酸盐岩和非常规非均质储层评价领域具有广阔的应用前景。Array acoustic logging reflected wave imaging is an important technology to detect the geological structure and characteristics around the wellbore,especially in the evaluation of fracture-vuggy carbonate rocks and unconventional heterogeneous reservoir.Extracting the reflected wave from the logging waveform is a key part of the method,but it is quite difficult to achieve effective and high-resolution separation of the reflected wave from the mode waves due to the high impedance reflection of the borehole wall,the noise interference and other factors.In order to solve this problem,this paper introduces a reflection wave extraction and noise suppression method based on shearlet transform for image enhancement.This proposed method combines the shearlet transform with two-dimensional Fourier transform to achieve multi-scale and multi-directional decomposition of array acoustic logging signals.It can be found that mode waves are focused on the horizontal cone region at a smaller scale in the shearlet domain.Therefore,by selecting a hard threshold to separate the mode wave and reflected wave signals,different components in the acoustic logging signal are identified.Thus,after suppressing the noise interference,high-resolution reflected wave extraction is achieved,which can improve the quality and clarity of reflected wave imaging.Based on the synthetic data of numerical simulations,the effectiveness and accuracy of the proposed method were verified by comparing the processing results with other methods.Finally,the field data results further verify the correctness of the proposed method.This method has broad application prospects in the evaluation of fracture-vuggy carbonate rock and unconventional heterogeneous reservoir.

关 键 词：阵列声波测井 高分辨率反射波成像 剪切波变换 储层评价 

分 类 号：P631.84[天文地球—地质矿产勘探]