�������ݽ��ر���������ѧ��̽�������������������ʴ��̼����(��C) ��ӫ����׷���������ɸѡ�������ӳ�����쳣��ָ�꣬Ȧ����������ۺ��쳣�����������ۺ��쳣�ͱ��ˢ��ۺ��쳣��������ۺ��쳣�����������ۺ��쳣�����쳣ǿ�ȴ�ƽ���ĶȺ�����ָ���ߵ�������Ϊ������������Զ�������ǽ�һ����̽����Ҫ����; �����ˢ��ۺ��쳣ǿ����������һ���IJο����塣��3 ������401 ������6 ���ͷ�4 �������������������ۺ��쳣�ϣ���ù�ҵ��������֤ʵ���쳣�������Ĵ��ڡ�

Multiple techniques such as soil acidolysis hydrocarbon��alteration carbonate and fluorescence spectrum analysis��have been used to select the indicators of anomalous hydrocarbon concentration in near-surface oil and gas geochemical exploration of Fangzheng fault depression. Three anomalous areas were identified including Hongqi--I��Xiliufang--II and Baoxing--III comprehensive anomalies. The Hongqi--I anomaly and Xiliufang--II anomaly�� characterized by rather strong anomalous signal��high average contrast and evaluation index��are regarded as the main prospects. The anomalous signal in Baoxing--III is weak��which is significant for reference. From the Well Fang--3��Fang--401��Fang--6 and Fang--4 all located on Xiliufang--II anomaly��the commercial oil obtained��which confirmed the petroleum occurrence underlying the anomaly.