摘要
在保持地震资料信噪比和振幅相对关系不变的前提下,进一步提高地震资料的分辨率一直是地震资料处理与解释人员研究的热点.在对陆上宽频采集的实际叠后地震资料频谱特征进行分析的基础上,研究了连续小波域自适应地震资料频谱拓展方法,讨论了方法的实现步骤,给出了高、低频基准频率的选取原则及频率拓展范围的计算方法.将该方法应用于准噶尔盆地两个不同工区三维宽频采集的叠前时间偏移数据,对比分析了方法应用前后目的层附近的过井线成像剖面及相应的多道归一化平均振幅谱,结果表明:该方法能明显拓展宽频采集的三维叠后地震资料高频有效信息,使得地震反射接触关系更加清楚、断裂特征得到改善、砂层组的空间展布变得清晰,有利于识别圈闭边界.同时,该方法能够很好地保持低频有效信息和较高的信噪比.
Improving the resolution of seismic data while maintaining its SNR and amplitude is a pertinent research topic in seismic data processing and interpretation.This study analyzes the spectral characteristics of broadband post-stack seismic data and introduces the method to expand the frequency spectrum bandwidth adaptively for seismic data in continuous wavelet domain.We indicate the detailed implementation steps,the selection criterion for high/low reference frequencies,and the bandwidth extending strategy.This method was applied to two 3D post-stack broadband seismic datasets from different regions of the Junggar Basin in the Xinjiang oilfield.The cross-well imaging profiles and its corresponding multi-channel normalized average amplitude spectra near the target layer before and after the application of this method are compared and analyzed.The comparison results demonstrate that this method can extend the high frequency information of 3D post-stack migrated broadband seismic data.Thus,the contact relationship of seismic reflections is more obvious,fracture characteristics are improved,and spatial distribution of the sand layer group is easier to discern,which assists in identifying the trap boundaries.The method can also help maintain low frequency effective signals and achieve high SNR.
作者
毛海波
范旭
杨晓海
黄坚
陈文超
MAO Haibo;FAN Xu;YANG Xiaohai;HUANG Jian;CHEN Wenchao(Institute of Geophysics,Research Institute of Exploration and Development,Xinjiang Oilfield Company,Petrochina,Urumuqi 830013,China;School of Electronic and Information Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
出处
《石油物探》
EI
CSCD
北大核心
2019年第4期541-546,579,共7页
Geophysical Prospecting For Petroleum
基金
国家自然科学基金(41774135,41504092)
国家重点研发计划项目(2017YFB0202902)共同资助~~
关键词
宽频地震数据
高分辨率
频谱拓展
自适应
连续小波变换
基准频率
broadband seismic data
high resolution
spectrum bandwidth extension
adaptive method
continuous wavelet transform
reference frequency
