���Ƶز�Ʒ������ Q ���������¹���ֲ�������Ԥ�ⶼ������Ҫ�����塣���ǵ������ڽ����д���ʱ������������ã�����ѡ�� 2D �������������ȫ���η��ݣ����۲Ⲩ��������ģ�����õ��IJ�������һ��Ŀ�꺯�������� L- - BFGS �㷨���ݳ��ز�Ʒ�����ӡ����÷���Ӧ�����쳣��ģ�ͺ� Marmousi ģ�Ͳ��ԣ�������������ݵ�ģ��������ģ�͵��������С�����㾫�ȸߣ�����Ч���á�

Estimating the stratigraphic quality factor Q is important for the description of tectonic distribution and the prediction of oil and gas�� Considering the viscous property of the medium when the wave propagation is modeled��2D visco- acoustic equation is used to full waveform inversion�� The observed wave field and the other wave field obtained by forward modeling construct an objective function��and L- - BFGS algorithm is used to inverse seismic quality factor�� To test the efficiency of this method (L- BFGS) in FWI��an abnormal model and a Marm- ousi model are examined from surface seismic data�� The results show that the inversion model is closer to the theori- cal model��high in the computational accuracy and good in inversion effect��