CAJ | 학술논문

针对常规的非线性反演方法存在稳定性较差及易陷入局部极值的问题,采用小波变换将原问题分解在不同的尺度上进行迭代反演,并以大尺度搜索为起点,逐步缩小尺度,最终降至目标函数的原始尺度,同时通过界约束以增加解的稳定性.对理论模型和实际资料分别进行的叠前弹性波反演结果表明,所提方法能有效提高反演的稳定性及精度.
침대상규적비선성반연방법존재은정성교차급역함입국부겁치적문제,채용소파변환장원문제분해재불동적척도상진행질대반연,병이대척도수색위기점,축보축소척도,최종강지목표함수적원시척도,동시통과계약속이증가해적은정성.대이론모형화실제자료분별진행적첩전탄성파반연결과표명,소제방법능유효제고반연적은정성급정도.
Due to the problems of poor stability and falling into local minimum easily in routine nonlinear inversion, wavelet transform was used to decompose original problem to different scale and iterative inversion. Then, scale was reduced step by step with the great scale search as the beginning so as to fall to primitive scale of the objective function ultimately. Simultaneously , search boundaries were set up to stabilize the solutions. The results by the inversion of theoretical model and real seismic data show that the proposed method can effectively improve the stability and accuracy of the inversion.