��������ϲ�����������ϵ���Ⱦ��ɹ��ʽϵ�( 66. 67%) ��ͨ����ʯ�����ܡ�������������԰���ϵ�ȴ�����Խ����о��������������������ϵ�����绯�������������㣬�ܹ��γɾ����ȴ��ĵ���������Ҫ��ѹ��ˮ�������ú���ˮ�������ã����������þ�����ʹ�����أ����в�ͬ����������: �绯��“����”��������ʴ��������󡢾����С�������ϸ��ز�ѹ��ˮ���·�����ϵ�����������õ���Ҫ����; ��״���졢Ƕ���ṹ�������󲻷������绯�DZ�������Ƿ�����ˮ�������õ���Ҫ��������Щ�������빹������Կɳ�ΪѰ���ȴ��ı�־��

In the central and southern area of Tianjin��the success rate of Ordovician geothermal well is only 66. 67%�� The stratabound of Ordovician geothermal fluid has been studied through the conditions of rocks��karst and construct�� The result shows that the karst on the top of Ordovician��was not enough in condition of weathering crust�� The geological formation which can form economical storage of geothermal fluids��has mainly compaction released water karst and hydrothermal karst�� Both karstifications are related with the geological structures and different in karst characteristics�� The weathering crust was“breakdown”��limonite was eroded into pyrite��and different crystal sizes are typical in characteristics of karstification by overlying compaction released water to underlying Ordovician�� Section-like structure��poikilitic texture��pyrite not developed and weathering crust well preserved are important characteristics of hydrothermal karstification�� These characteristics and the relationship with the structure can be a symbol for finding the reservoirs��