| Facies Architecture Model of the Shimentan Formation Pyroclastic Rocks in the Block-T Units, Xihu Sag, East
China Sea Basin, and its Exploration Significance |
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| 作者姓名： | DAI Xiaojuan TANG Huafeng ZHANG Tao ZHAO Pengjiu XU Chunming KONG Tan ZHAO Tianliang WANG Pujun |
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| 基金项目： | Thanks to Xu Yuanyin,Yin Yongkang,He Kailun,Zhu Chenxi,and Guo Tianchan for sample collection and laboratory testing.This study was supported by the National Natural Science Foundation of China;the MOST;the National Science and Technology Major Project of the Ministry of Science and Technology of China;the Natural Science Foundation of Jilin Province;We would like to thank all the people who provided us with invaluable help |
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| 摘 要： |
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| 收稿时间： | 2018/8/2 0:00:00 |
| 修稿时间： | 2019/11/15 0:00:00 |
Facies Architecture Model of the Shimentan Formation Pyroclastic Rocks in the Block‐T Units,Xihu Sag,East China Sea Basin,and its Exploration Significance |
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| Authors: | DAI Xiaojuan TANG Huafeng ZHANG Tao ZHAO Pengjiu XU Chunming KONG Tan ZHAO Tianliang and WANG Pujun |
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| Institution: | 1 Collegeof Earth Sciences, Jilin University, Changchun130061, China
2 Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources, Changchun 130061, China
3 Key Lab for Evolution of Past life and Environment in Northeast Asia, Ministry of Education, Changchun 130026, China,1 Collegeof Earth Sciences, Jilin University, Changchun130061, China
2 Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources, Changchun 130061, China
3 Key Lab for Evolution of Past life and Environment in Northeast Asia, Ministry of Education, Changchun 130026, China,4 Shanghai Branch of CNOOC Ltd., Shanghai 200030, China,1 Collegeof Earth Sciences, Jilin University, Changchun130061, China
2 Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources, Changchun 130061, China
3 Key Lab for Evolution of Past life and Environment in Northeast Asia, Ministry of Education, Changchun 130026, China,4 Shanghai Branch of CNOOC Ltd., Shanghai 200030, China,1 Collegeof Earth Sciences, Jilin University, Changchun130061, China
2 Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources, Changchun 130061, China
3 Key Lab for Evolution of Past life and Environment in Northeast Asia, Ministry of Education, Changchun 130026, China,4 Shanghai Branch of CNOOC Ltd., Shanghai 200030, China and 1 Collegeof Earth Sciences, Jilin University, Changchun130061, China
2 Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources, Changchun 130061, China
3 Key Lab for Evolution of Past life and Environment in Northeast Asia, Ministry of Education, Changchun 130026, China |
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| Abstract: | A gas field consisting of volcanic reservoir rocks was discovered in the block-T units of the Xihu Sag, East China Sea Basin. The lithology of the volcanic rocks is dominated by tuff and reworked tuff. The lithofacies are dominated by base surge deposits of explosive facies. As the architecture model of volcanic facies is still uncertain, it has restricted the exploration and development of mineral resources in this area. Using core and cuttings data, the lithology, lithofacies, geochemistry as well as grain size characteristics of volcanic rocks were analyzed. Based on these analyses, the volcanic rocks in the well section are divided into three eruptive stages. The transport direction of each volcanic eruption is analyzed using crystal fragment size analysis. The facies architecture of the block-T units was established based on the reconstruction results of paleo-geomorphology. The results show that the drilling reveals proximal facies (PF) and distal facies (DF) of the volcanic edifices. However, the crater-near crater facies (CNCF) are not revealed. Compared with the reservoirs of the Songliao Basin, it is shown that the volcanic rocks in the Xihu Sag have good exploration potential; a favorable target area is the CNCF near the contemporaneous fault. |
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| Keywords: | volcanic rocks Shimentan Formation facies architecture eruptive stage East China Sea Basin |
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