���� ECS (Elemental Capture Spectroscopy) �⾮������ Gd �� Ti ����ͼ���л�ɽ�ز�Աȡ���������������������ʻ�ɽ�ز�ɻ���Ϊ5 ���ز㵥Ԫ; �������Լ���ڵ� CS13 �� CS14 ������ʾ Ti Ԫ�ر仯�������ϸ���� (���緢��) �����ߣ����Ʋ��ɽ�緢˳��Ϊ�ڴ� 1 - -�ڴ� 2 - -�ڴ� 3����ɽ����ϵ�������Ǩ�Ʊ仯���������� (�ڴ� 1) - - ǿ (�ڴ� 2) - -�� (�ڴ� 3) ���緢���С��Ա�ʵ���϶�ȡ���͸�����緢�ڴεĹ�ϵ����֪�ڴ� 2 �����������ţ��ڴ� 1 ��֮���ڴ� 3 �������Խϲ��������ֲ����ڴ� 2 ��Χ�ڡ�

The cross- plot of Gd and Ti of ECS (Elemental Capture Spectroscopy) well logging data is used to contrast the volcanic layers�� The results show that the rhyolitic volcanic layer in Wangfu fault depression can be di- vided into 5 stratigraphic units�� The CS13 and CS14 wells with obvious break- in periods reveal that the characteris- tics of Ti is high in later eruption stage�� so the volcanic eruptive sequence is the stages: 1- 2- 3�� The volcanic activi- ty migrated from south to north��with the eruptive strength from weak (eruptive stage1) to strong (eruptive stage 2) and then to weak (eruptive stage3) in sequence�� The reservoir quality in descending order is eruptive stage 2- 1- 3 according to the relationship between the porosity and permeability of logging and the eruptive stages��and the distribution of favorable reservoir is in the eruptive stage 2��