���������̽���ݴ��������ܶԵ��´��ڵĶ���ǵ��ʹ���������ij���Ч��ʱ��Ӧ��������Դ��������ֱ��������( VSP��vertical seismic profile) �����ع��ɵ�������( SWP��single well profile) ���ݣ�����ʹ�ù۲�ϵͳ�ع������ӽ��ھ�����Ŀ�����λ�ã���Դ�ͼ첨����λ�ڸ��ӵĸ���֮�²����⾮�͵ر�֮��δ֪�ٶ���Ϣ��Ӱ�죬�Ӷ���öԵ��µ��ʹ�����õij���ֱ��ʡ������ǵ����´�������ϲ������Ķ���ǵ��ʹ���ʱ��������Դ�������Զ�Ŀ��������ܺõij���Ч�������Ľ������������ݺ͵��Բ����ݵ�ģ��ʵ�飬��ģ���еĶ���������Ϊ�ϲ㣬����������Դ��������̽����¶���ǵ��ʹ�����������������͵��Բ����ʶ����������ij�����; ��Ӧ��ϡ��۲�ϵͳ���в���ʱ����Ȼ���Եõ��Ϻõij���Ч����

When the conventional seismic data processing methods failed to acquire the satisfactory imaging results of subsurface steep structure��the virtual source method should be applied to convert the traditional vertical seismic profile ( VSP��vertical seismic prodile) gathers into virtual single well profile ( SWP��single well profile) gathers�� After that��geometry was reconstructed closer to the structure targets near wells to get the better image resolution of subsurface geological body��and the seismic source and geophone under complex overburden to avoid the effect by unknown velocity information between wells and surface�� Especially��when the steep structure such as faults present in the subsurface��the virtual source method can produce better image results�� The authors modeled acoustic and elastic data��set the faults as steep structures��and tested the ability of virtual source method to detect the steep structure in the subsurface��which obtained the satisfactory imaging results of acoustic and elastic medium�� This method still gets the good imaging results when sparse geometry was used to survey��