Ŀǰ��������̽�Ѿ��Ӽ򵥹��쿱̽ת�����Կ�̽�����̽����Ҫ����Ŀ��֮һ�ǵز�--���������أ�Q ֵ�ڵز�--����������̽������Ҫ���á�Ϊ�Ϻõع��Ƶز��Q ֵ����������˻��� BFGS �㷨�͹���S �任��Q ֵ���Ʒ�����ͨ������S �任�õ���ͬ����ʱ�̵�����ף�����һ�����Ż����⣬����BFGS �㷨���Ƴ�����Ʒ�����ӡ��÷�������������Ƶ����Χ�ڼ�������׵Ļ����ϵ����������Ƶ����Χѡ������⣬���������ٶȸ��졣ģ��������ʵ�����ϴ��������������÷���������Ч���ٵع���Ʒ�����ӣ������нϺõĿ����ԡ�

Oil and gas explorations have been shifting from simple structure exploration to lithological exploration�� today�� One of the major geological exploration targets is the stratigrarhic-lithological reservoirs in the future�� The Q value is significant in stratigrarhic-lithological exploration�� In order to estimate the Q value��we propose the Q value estimation method based on BFGS algorithm and generalized S-transform�� We get amplitude spectrum of different travel times by generalized S-transform and constructing an optimization problem��and then use BFGS algorithm to estimate seismic quality factor�� The method can calculate the cross correlation coefficients of amplitude spectrum in the whole band range and avoid the influence of the band range�� The convergence speed of the BFGS method is faster�� Simulated examples and actual data processed results show that the method estimated quality factor effectively with better anti-noise property��