基于改进目标函数的频率域全波形反演研究  

Frequency-domain Full Waveform Inversion Algorithm Based on Improved Objective Function

作　　者：廖文[1] 杨艳[1] 张东[1] 

机构地区：[1]武汉大学物理科学与技术学院,武汉430072

出　　处：《科技通报》2016年第4期1-5,共5页Bulletin of Science and Technology

基　　金：国家科技重大专项(2011ZX05003-003)

摘　　要：频率域全波形反演计算高效、反演精度高,已成为地震勘探利用叠前地震波场的运动学和动力学信息重建地下速度结构的有力工具,但其对初始模型要求较高。针对该算法的不足之处,提出对算法中固定不变的目标函数进行改进,在反演过程中有针对性的调整目标函数,以降低方程组的不确定性,达到降低对初始模型依赖性的目的。实验表明,改进目标函数后的算法在初始模型较差时,相比常规算法仍能得到更高精度的反演结果。Frequency-domain full waveform inversion(FWI) had become a powerful tool for the use of pre-stacked data to estimate the underground velocity model because of its high computational efficiency and high accuracy. But it had a high requirement against the initial model. To overcome this problem, this paper proposed an improved objective function algorithm. In the inversion program, the objective function adjusted to decrease the equation’s indeterminacy and the dependence to the initial model. The experiment results show that compared to the original algorithm, the improved algorithm can improve the inversion results when the initial models were not good.

关 键 词：频率域全波形反演 初始模型 局部极小 目标函数 

分 类 号：O581[理学—物理] P631.4[天文地球—地质矿产勘探]