�齭����ط�خ��Ȼ����PY ����λ�����۴��ϣ�����ij����������¸���������̽�ĸ��� T50 ���㲴�ɱȹ�ϵ�쳣���������������dz����ӡ�Ϊ���õ��жϴ���ĺ������ԣ�����Biot-Gassmann ���̶����۴�������������ʽ������滻�����鲻ͬ���������´���ĺ�������Ӧ�������о��������: Biot-Gassmann ��������Ч���������۴�����������滻�о�; ���۴�T50 ���㺬ˮ�ͺ���ʱ��AVO ��Ӧ�����������������Ӧ�ķ�ֵ��ͬ����ˮɰ�ҵķ�ֵ��С��

The PY gas field of Panyu natural area in Pearl River Mouth Basin was located in slope break belt�� where the special sedimentary environment led to the Poisson's ratio anomaly of T50 reservoir of drilled wells��and the hydrocarbon feature in very complication�� In order to determine the hydrocarbon of reservoir��the authors used the Biot-Gassmann equation to do fluid substitution of slope break belt reservoir and test the reservoir hydrocarbon response characteristics under different fluid characteristics�� The results showed that Biot-Gassmann equation can be more effectively applied into the fluid substitution work in slope break belt reservoir�� The AVO response characteristics was similar of T50 reservoir containing water or gas��but the amplitude was different��the amplitude of water- bearing sandstone was smaller��