Title

Adaptive method for the joint inversion of multiscale seismic data

单位

(1.中国石油化工股份有限公司胜利油田分公司物探研究院,山东东营257022;中国石油大学(华东)地球科学与技术学院,山东青岛266580)

Organization

(1.Geophysical Research Institute of Shengli Oilfield Branch Co.,Sinopec,Dongying 257022,China；2.School of Geosciences,China University of Petroleum(East China),Qingdao 266580,China)

摘要

对多尺度地震资料进行联合反演可以提高储层的分辨能力。在多尺度地震资料联合反演过程中,因受地面地震、VSP地震和井间地震资料不同尺度数值影响,联合反演目标函数的收敛条件不确定,难以取得稳定且具有地质意义的效果。针对该问题,提出了一种多尺度地震资料自适应联合反演方法,该方法将标准差项引入联合反演目标函数,改进了联合反演目标函数,通过计算不同尺度地震资料的标准差项,实现了多尺度地震资料的自适应规范化。对改进后的目标函数进行重新推导和反演,可提高反演结果的稳定性。二维模型和实际地震资料的试验表明,该方法的稳定性和计算效率较高,可以快速得到合理的多尺度地震资料反演结果。与常规稀疏脉冲反演方法结果相比,利用该方法得到的反演结果分辨率更高。

Abstract

The joint inversion of multiscale seismic data can improve the imaging resolution of reservoirs.During the inversion process,the convergence conditions of the objective function are uncertain,which makes it difficult to obtain stable results with geological significance.This difficulty arises from the different scale of the numerical values of surface,vertical and inter-well seismic data.To overcome this issue,a self-adaptive normalization method was proposed.The method includes an improved objective function that accounts for the standard deviation of the values involved in the calculation.This led to improved inversion stability.Tests on two-dimensional simulated and actual input data demonstrated an improved stability and calculation efficiency with respect to the conventional sparse spike inversion method.

关键词：

波阻抗反演; 贝叶斯理论; 多尺度地震资料; 联合反演; 目标函数; 自适应; 规范化; 分辨率;

Keywords:

impedance inversion;; Bayes theory;; multiscale seismic data;; joint inversion;; objective function;; adaptive;; normalization;; resolution

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基金项目

国家重点研究发展计划“深部钾盐探测方法与技术研究”(2017YFC0602804)和中石化研发项目(P18051-5)共同资助。

DOI

10.3969/j.issn.1000-1441.2021.02.014

联合反演中多尺度地震资料自适应方法研究