地球物理学进展 ›› 2016, Vol. 31 ›› Issue (4): 1678-1687.doi: 10.6038/pg20160436

• 应用地球物理学Ⅰ • 上一篇    下一篇

全波形反演初始模型建立策略研究综述

王连坤1,2, 方伍宝1, 段心标1, 曹文俊2, 李振春2   

  1. 1. 中国石油化工股份有限公司石油物探技术研究院, 南京 211103;
    2. 中国石油大学(华东)地球科学与技术学院, 青岛 266580
  • 收稿日期:2015-06-12 修回日期:2015-11-23 出版日期:2016-08-20 发布日期:2016-08-20
  • 作者简介:王连坤,男,1991,硕士研究生,主要从事反演成像等研究.(E-mail:1105203832@qq.com)
  • 基金资助:

    国家重大专项课题(2016ZX05014-001-002)资助.

Review of full waveform inversion initial model building strategy

WANG Lian-kun1,2, FANG Wu-bao1, DUAN Xin-biao1, CAO Wen-jun2, LI Zhen-chun2   

  1. 1. SINOPEC Geophysical Research Institute, Nanjing 211103, China;
    2. School of Geoscience, China University of Petroleum (East China), Qingdao 266580, China
  • Received:2015-06-12 Revised:2015-11-23 Online:2016-08-20 Published:2016-08-20

摘要:

全波形反演充分利用叠前地震波场中的运动学和动力学信息估计地球内部介质的弹性参数,是一种高精度的速度建模方法和油藏描述的手段.但是对于实际资料,尤其是陆地资料,全波形反演很难收敛到正确的结果上,往往无法实现其建立高精度速度模型的目标,需要较准确的初始模型来降低误差泛函的非线性性.研究与调研认为,建立全波形反演初始模型的方法主要有三种:走时层析、偏移速度分析和Laplace域反演.本文首先分析了全波形反演对初始模型的严重依赖性,其次对全波形反演初始模型建立策略进行简要的介绍与分析,最后给出了建立全波形反演初始模型的认识及建议.

Abstract:

Full waveform inversion makes full use of the kinematic and dynamic information,which are in the prestack seismic data, to estimate the elasticity parameters of the earth's interior medium, and is a kind of high-accuracy velocity model building method and means of reservoir description. But for the actual data, especially the land data, full waveform inversion is difficult to converge to the correct results, it often can not reach the goal of building the high-accuracy velocity model, this is because the relationship between the seismic wave field (especially, reflection wave field) and the geophysical parameters is strongly nonlinear, the error function of the FWI exists a huge number of local extreme value point, and this will seriously affect the convergence results of the inversion, so we need a high-accuracy initial model to reduce the nonlinear of the error function in the actual application. From the inversion strategic of the FWI, a prerequisite condition for the FWI successful implementation is to estimate a macro velocity model with higher accuracy. Of course, how to establish an accurate initial model is also a research hotspot in the field of exploration. After a long research and investigation, we think that the building methods of the full waveform inversion initial model basically has the following three kinds: traveltime tomography inversion, migration velocity analysis and Laplace domain inversion. This paper first briefly analyses the full waveform inversion serious dependence on initial model, then introduces and analyses briefly the full waveform inversion initial model building strategy, finally gives the suggestions to build the full waveform inversion initial model.

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