时频重排方法在川西坳陷须家河组地震含气性检测中的应用

英文篇名：Time-Frequency Reassignment in the Study of Gas Reservoir Seismic Detection of Xujiahe Formation in West Sichuan Depression
中文刊名：地质科技情报
英文刊名：Geological Science and Technology Information
作者：吴小羊 ; 刘天佑 ; 唐建明 ; 徐天吉
英文作者：WU Xiao-yang1a ; LIU Tian-you1b ; TANG Jian-ming2 ; XU Tian-ji2(1a.Graduate School ; 1b.Institute of Geophysics and Geomatics ; China University of Geosciences ; Wuhan 430074 ; China ; 2.Deyang Branch Institute ; Exploration & ProductionResearch Institute ; Southwest Branch Co. ; SINOPEC ; Deyang Sichuan 618000 ; China)
中文关键词：重排 ; Wigner-Ville分布 ; 时频局域性 ; 地震信号 ; 须家河组 ; 川西坳陷
英文关键词：reassignment ; Wigner-Ville distribution ; time-frequency locality ; seismic signal ; Xujiahe Formation ; west Sichuan Depression
出版日期：2008-05-15
机构：中国地质大学地球物理与空间信息学院,中国地质大学地球物理与空间信息学院,中国石油化工股份有限公司西南分公司勘探开发研究院德阳分院,中国石油化工股份有限公司西南分公司勘探开发研究院德阳分院武汉430074,武汉430074,四川德阳618000,四川德阳618000
年：2008
期：03
出版单位：地质科技情报

摘要

针对川西坳陷上三叠统须家河组储层埋深大、密度高导致地震反射信号有效频带窄、高频衰减快、主频很低的现象,研究采用重排平滑伪Wigner-Ville分布(RSPWVD)对地震信号进行频谱分析。首先采用时域和频域核函数平滑的方法,以抑制信号经Wigner-Ville分布函数频谱分析后产生的交叉项,再将能量的平均值按照区域能量的重心分配,重新安排信号在时频平面内的能量分布。对川西坳陷须家河组工区三维地震反射数据过井剖面进行RSPWVD时频分析,并与常规时频分析方法进行对比的结果表明,RSPWVD适用于地震信号的时频分析,并有利于突出时频的局部化特征和储层的微观结构,时频分辨率得到了提高。
Deep embedding depth and high density of the Upper Triassic Xujiahe reservoir of west Sichuan Depression lead to narrow effective band, fast attenuation of high-frequency and low main frequency of seismic signals. In this paper, the rearrangement smoothed pseudo-Wigner-Ville distribution (RSPWVD) is used on the seismic signal spectral analysis. First , the smoothed pseudo-Wigner-Ville distribution with core function is applied to smooth signals in time and frequency domain so that its impact of cross-terms is reduced. Then, the average energy in the time-frequency domain is redesigned according to the barycenter of regional energy in order to maintain a good time-frequency energy distribution. Finally, RSPWVD is adopted to process through-well seismic profile of 3D reflection seismic data of Xujiahe Formation of west Sichuan Depression, and compare with normal time-frequency analysis. The results show that RSPWVD has a better energy focus on the time-frequency locality and a good show of micro-structure of the reservoir.

引文

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