测井技术2025，Vol.49Issue(4)：500-509,10.DOI:10.16489/j.issn.1004-1338.2025.04.002
井孔模式波反射波信号的特征及识别方法研究
Research on the Characteristics and Identification Methods of Reflected Signals of Borehole Mode Wave
摘要
Abstract
Affected by factors such as borehole expansion and axial non-uniform formation development,there are not only reflected waves of abnormal bodies near the well in the far-detection acoustic logging wave field,but also reflected wave signals of borehole mode waves.The existence of the latter often leads to the multi-solution of the interpretation results of far-detection acoustic logging data,which brings serious interference to the exploration and development of oil and gas reservoirs and fracturing construction and transformation.Aiming at the phenomenon that the reflected wave of the borehole mode wave and the reflected wave signal of the abnormal body near the well exist at the same time in the remote detection acoustic logging,the numerical simulation of the dipole acoustic logging response under the condition of borehole enlargement and the formation interface near the well is carried out.The waveform characteristics of the flexural wave reflected wave caused by borehole enlargement and the reflected wave signal from the formation interface near the well are analyzed.The results show that the slope of the in-phase axis of the flexural wave reflected wave in the equal source distance waveform(depth-time domain)is approximately half of the shear wave velocity of the formation.The top of the in-phase axis of the flexural wave reflected wave caused by the expansion of the diameter coincides with the in-phase axis of the direct wave of the flexural wave.In the common shot point waveform(source distance-time domain),the apparent velocity of the flexural wave reflected wave caused by the expansion is consistent with the wave velocity of the flexural wave propagating along the borehole,and the waveform amplitude is large,while the waveform amplitude of the reflected wave from the abnormal body near the borehole is small.In this paper,a method for identifying the reflected wave signal of borehole mode wave is proposed.This method has a good application prospect in the quality monitoring of the interpretation results of remote detection acoustic logging data.关键词
远探测声波测井/井孔模式波反射波/井旁异常体反射波/等源距波形/共炮点波形/反射波同相轴斜率/数值模拟分类
天文与地球科学引用本文复制引用
杨博,车小花,赵腾,卢俊强,门百永,乔文孝..井孔模式波反射波信号的特征及识别方法研究[J].测井技术,2025,49(4):500-509,10.基金项目
国家自然科学基金项目"CO2地质封存下的不相混流体非均匀多相孔隙地层中的声场"(12334019) （12334019）
国家自然科学基金项目"三维散射声波远探测扫描成像测井方法研究"(12274465) （12274465）
国家自然科学基金项目"井下声电效应测井探测器电磁兼容特性研究"(42174218) （42174218）
