利用双向匹配追踪提高地震分辨率  

Seismic resolution improvement with bilateral matching pursuit

作　　者：刘兰锋[1] 王鲁 李丽华 

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国石油集团测井有限公司技术中心,陕西西安710021 [3]北京雅丹石油技术开发有限公司,北京102200

出　　处：《石油地球物理勘探》2016年第4期769-773,6,共5页Oil Geophysical Prospecting

摘　　要：在常规时间域匹配追踪子波分解的基础上,提出了时频谱匹配追踪子波合成的思路,类似于数字信号处理的正、反过程,基于Gabor反褶积的理论框架,利用双向匹配追踪算法,在时频域实现了一种非平稳的提高地震分辨率方法,其流程为:(1)将地震道数据进行正向匹配追踪子波分解,将每个子波的时频谱进行叠加得到地震道的时频谱;(2)通过匹配追踪时频谱平滑和数学运算,得到近似反射系数时频谱;(3)对反射系数时频谱进行反向匹配追踪,得到一系列高分辨率的地震子波,进而合成高分辨率地震道。对实际地震资料的处理结果表明,该法有效拓宽了地震资料的相对频带,提高了地震数据的分辨率。Based on conventional matching pursuit in the time domain, we put forward a matching pursuit in the time-frequency domain. Same as forward and inverse transform in signal processing, bilateral matching pursuit is implemented. In the time-frequency domain, an approach to seismic resolution improvement is achieved with this bilateral matching based on the theoretic framework of Gabor deconvolution. The approach workflow is shown as follows: First, seismic traces are decomposed into a series of wavelets using forward matching pursuit, and the time-frequency spectrum is obtained by wavelet spectrum accumulation; then, approximate reflection coefficient spectrum is calculated by the time-frequency spectrum smoothing; finally, the time-frequency spectrum is processed by inverse matching pursuit to get high-resolution wavelets and synthesis trace. Real seismic data applications show that the proposed approach extends seismic relative bandwidth and improves resolution. © 2016, Editorial Department OIL GEOPHYSICAL PROSPECTING. All right reserved.

关 键 词：匹配追踪 反褶积 相对频带 分辨率 

分 类 号：P631[天文地球—地质矿产勘探]