��������°���ͳɳ�������������ݵ���Ҫ��Դ�ҷ�����ϵ��Ŀǰ�꾮��ʾ���ȴ� ( ��700 m) �� ����� ( ��3 500 m) �����꾮�󶼷ֲ��������ݵı߲��������ڲ���Դ�Ҳ��ʾ�١����ݶ��ݽṹ��ʽ���������������ܽ�����ϻ�״���ݺ�˫�ϵ�ǵʽ��������ɳ��������Դ�ҷ���ģʽ����ȷ�������Դ����Ҫ�����ִ�����ʽ�������в�ϯ״ƽ�нṹ���ɲ��ԡ������Ժõĵ�������������Դ����Ϊ��ʵ����ҪΪ���- -������࣬��ɫ���Һ�ȴ󣬰��رȸ�( 45% ��70%) �� ���ɳ��������Դ����������Լ 148. 38 ×10 12 m 3 ����Ȼ����ԴDZ���޴�

Shahezi Formation of Lower Cretaceous is the main source rock in the deep fault- depression of Songliao Basin�� The present drilling data reveal that it is large in thickness ( �� 700 m) and deep in burial ( ��3 500 m)�� However��most wells are located in the margin of the deep fault depression��which brought about relatively rare information on the source rocks in the internal fault basin�� On the basis of the structural style and seismic reflection feature of the fault depression��two development models of source rocks in Shahezi Formation are summarized��including the dustpan shape unilateral fault depression and graben bilateral fault depression�� Mean- while�� there exist five types of deep source rocks�� The source rocks in the central fault depression which have paral- lel structural��stratified and continuous seismic reflections are most reliable�� These source rocks are characterized by deep and semi- deep lacustrine facies with large thickness and big ratio of dark mudstone and stratum (45% ��70%)�� The quantity of gas generating in the studied area is 148. 38 ×10 12 m 3 ��which indicates a huge po- tential of gas��