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2016, 35(1) 264-274 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Constraint of incompatible elements in ECS to comparison of thin layer volcanostrata: a case study of rhyolitic volcanostrata of Huoshiling Formation in Wangfu fault depression��southern Songliao Basin��NE China |
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LI Jian-Hua, QU Wei-Hua, ZHAO Ran-Lei, LIU Hong-Tao, TANG Hua-Feng |
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1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. PetroChina Jilin Oilfield Company��Songyuan 138000��Jilin��China |
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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 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�� |
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Keywords��
Songliao Basin
Wangfu fault depression
Huoshiling Formation
incompatible elements
eruptive stages of volcanostratigraphy
ECS logging
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Received Revised Online: |
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