基于修正褶积模型的地震反演方法  

Seismic inversion with modified convolution

作　　者：邓炜 印兴耀[1] 宗兆云[1] DENG Wei YIN Xingyao ZONG Zhaoyun(China University of Petroleum （Ea st China） School of Geoscience, Qingdao 266580,Chin)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,青岛266580

出　　处：《物探化探计算技术》2017年第2期224-230,共7页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金(U1562215);中国博士后科学基金(2014M550379);山东省博士后创新基金(2014BSE28009)

摘　　要：在地震反演中,地震信号可以认为反射系数与地震子波的褶积,在此过程地震子波振幅保持不变。这里提出一种修正的褶积模型,将透射损失融入褶积过程中,表现为子波振幅的衰减,对于砂泥岩互层介质,修正褶积模型更加真实地刻画地震信号形成过程。基于修正褶积模型建立新的反演目标函数,反演得到的反射系数消除了透射损失的影响。与基于常规褶积反演得到的反射系数相比较,此方法保证了更多有效信息的体现。实际资料应用表明,基于修正褶积模型的地震反演方法提高了反演结果的合理性。Seismic signal can be considered as the convolution of reflection and wavelet. In this process the wavelet ampli-tude remains unchanged. This paper proposes a modified convolution model that transmission loss will be integrated into convo-lution by the performance of the wavelet amplitude attenuation. For sandstone and mudstone interbedded medium, modified convolution shows more realistic characterizations of the seismic signal forming process. Then the new inversion objective func-tion is established based on modified convolution, and the influence of the transmission loss is eliminated. When compared with inversion based on conventional convolution, more effective information can be obtained. The real data application shows this approach is more rational.

关 键 词：地震反演 修正褶积 透射损失 

分 类 号：P631.4[天文地球—地质矿产勘探]