Laplace-Fourier域多尺度高效全波形反演方法  

An efficient multi-scale waveform inversion method in Laplace-Fourier domain

作　　者：胡英[1] 张东[2] 袁建征 黄绍坚 姚弟[2] 徐凌[1] 张才[1] 秦前清[3] 

机构地区：[1]中国石油勘探开发研究院物探技术研究所 [2]武汉大学物理科学与技术学院 [3]武汉大学测绘遥感信息工程国家重点实验室

出　　处：《石油勘探与开发》2015年第3期338-346,共9页Petroleum Exploration and Development

基　　金：国家科技重大专项"大型油气田及煤层气开发"(2011ZX05003-003);中国石油天然气股份有限公司配套项目"中西部前陆冲断带地震勘探关键技术应用研究"(2011B-0406)

摘　　要：针对常规Laplace-Fourier域全波形反演计算量大、耗时长的问题,提出一种多尺度高效Laplace-Fourier域全波形反演方法,并针对Marmousi和Overthrust模型进行数值模拟。Laplace-Fourier域多尺度高效全波形反演方法对于不同频率点选择大小不同的网格,并且根据Laplace衰减常数选择不同的模型计算区域深度,既不影响反演精度,又显著提高反演计算效率,同时由于反演网格数减少,反演稳定性也有所提高。Marmousi和Overthrust模型的反演结果验证了算法的有效性,同时在缺失低频信息时,Laplace-Fourier域多尺度高效全波形反演结果仍较好。Aiming at the problem that large computational resources and long computation time are required for the conventional Laplace-Fourier domain waveform inversion, an efficient multi-scale grid algorithm with variable computed area is proposed, and used in inversion modeling of the Marmousi and Overthrust model. This algorithm can choose a proper grid spacing automatically according to the different frequency, and adjust the depth of computing area according to the Laplace damping constant. This algorithm not only improves inversion efficiency significantly without the loss of inversion precision, but also improves the stability due to the decrease of grid number. Inversion results of the Marmousi and Overthrust model demonstrate the validity of the algorithm. In addition, the inversion results by the algorithm still can be approximate to the real model when low frequency information is missing.

关 键 词：Laplace-Fourier域 全波形反演 多尺度网格 多尺度计算 反演精度 反演效率 

分 类 号：TE122[石油与天然气工程—油气勘探]