| PDF: | |
| Time: | 2016 |
| Journal: | Global Geology |
| Volumn: | 35 |
| Issue: | 1 |
| Pages: | 264-275 |
| Type: | Other |
| Author: | Jianhua Li,Weihua Qu,Ranlei Zhao,Hongtao Liu,Huafeng Tang |
Abstract: | 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 divided into 5 stratigraphic units． The CS13 and CS14 wells with obvious break- in periods reveal that the characteristics of Ti is high in later eruption stage， so the volcanic eruptive sequence is the stages: 1- 2- 3． The volcanic activity 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． |