基于改进相移法的煤田地震瑞利波资料处理  

Processing of the seismic Rayleigh wave data of coalfields based on the improved phase-shift method

作　　者：李欣欣 李江 刘军 沈鸿雁 LI Xin-Xin;LI Jiang;LIU Jun;SHEN Hong-Yan(College of Earth Sciences&Engineering,Xi'an Shiyou University,Xi'an 710065,China;Shaanxi Key Laboratory of Petroleum Accumulation Geology,Xi'an Shiyou University,Xi'an 710065,China;SINOPEC Key Laboratory of Geophysics,Nanjing 211103,China;Xi'an Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.,Xi'an 710077,China)

机构地区：[1]西安石油大学地球科学与工程学院,陕西西安710065 [2]西安石油大学陕西省油气成藏地质学重点实验室,陕西西安710065 [3]中国石化地球物理重点实验室,江苏南京211103 [4]中煤科工集团西安研究院有限公司,陕西西安710077

出　　处：《物探与化探》2022年第6期1470-1476,共7页Geophysical and Geochemical Exploration

基　　金：陕西省自然科学基础研究计划资助项目(2021JQ-589);中国石化地球物理重点实验室开放基金资助项目(33550006-20-ZC0699-0009)。

摘　　要：相移法是一种常用的提取瑞利波频散曲线的方法,然而在复杂波场条件下,相移法计算的频谱中瑞利波频散能量分辨率较差,使得频散曲线的准确性降低。本文对相移法进行改进,将频散谱上各点的振幅值进行求幂运算,以提高频散能量的收敛性与聚焦性。我们利用改进的相移法对理论地层模型的模拟数据和某研究区的煤田地震实际数据进行处理,将处理结果与常规相移法生成的频散谱对比分析,并对实际资料的频散曲线进行反演,生成研究区地层的二维(2D)横波速度剖面。研究结果表明改进的相移法能够增强瑞利波信号在频率—速度域中的信噪比,提高频散能量谱的分辨率和频散曲线的准确性。The phase-shift method is commonly used to extract the Rayleigh wave dispersion curves.However,in the case of a complex wave field,the dispersion spectra calculated using the phase-shift method have a low resolution of Rayleigh wave dispersion energy,reducing the accuracy of the dispersion curves.This study improved the phase-shift method by obtaining the power exponent of the amplitude of each point on the dispersion spectra to improve the convergence and focusing properties of the dispersion energy.The improved phase-shift method was used to process the simulated data of the theoretical stratigraphic model and the actual seismic data of a coalfield in a certain study area.The processing results were compared with the dispersion spectra generated using the conventional phase-shift method.Moreover,the inversion based on dispersion curves of the actual data was conducted to generate a two-dimensional(2D)S-wave velocity section of the study area.As revealed by the study results,the improved phase-shift method can enhance the signal-to-noise ratio of the Rayleigh wave signals in the frequency-velocity domain and improve the resolution of the dispersion energy spectra and the accuracy of the dispersion curves.

关 键 词：瑞利波 相移法 频散曲线 

分 类 号：P631.4[天文地球—地质矿产勘探]