| 汶川地震断层带结构及渗透率 |
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| 引用本文： | 陈建业, 杨晓松, 党嘉祥, 何昌荣, 周永胜, 马胜利. 汶川地震断层带结构及渗透率[J]. 地球物理学报, 2011, 54(7): 1805-1816, doi: 10.3969/j.issn.0001-5733.2011.07.014 |
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| 作者姓名： | 陈建业 杨晓松 党嘉祥 何昌荣 周永胜 马胜利 |
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| 作者单位： | 中国地震局地质研究所,地震动力学国家重点实验室,北京 100029 |
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| 基金项目： | 科研院所基本科研业务专项项目，地震动力学国家重点实验室自主研究课题，国家科技专项汶川地震断裂带科学钻探项目 |
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| 摘 要： | 对汶川地震断层带进行了跨断层的渗透率测量. 结果显示汶川地震断层由低渗的核部(2.4×10-19 ~ 3.8×10-16 m2)、高渗的破碎带(3.7×10-16 ~3.0×10-15 m2)以及含裂隙原岩(6.0×10-18 ~4.3×10-13 m2)组成(有效压力 40 MPa),其中新鲜断层泥具有最低的渗透率. 断层泥和两侧原岩由于渗透率低,阻碍流体跨断层带流通, 断层带内的流体活动局限在高渗的破碎带中, 这一结果与断层岩显微结构和粒度分布特征能很好的吻合. 对汶川地震同震热压作用发生的条件进行了探讨, 结果显示, 约2 km以下汶川地震主滑动带具有发生热压作用所要求的低渗透率特征.
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| 关 键 词： | 汶川地震 地震断层 渗透率 流体高压 热压作用 |
| 收稿时间： | 2010-08-20 |
| 修稿时间： | 2011-03-30 |
Internal structure and permeability of Wenchuan earthquake fault |
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| CHEN Jian-Ye, YANG Xiao-Song, DANG Jia-Xiang, HE Chang-Rong, ZHOU Yong-Sheng, MA Sheng-Li. Internal structure and permeability of Wenchuan earthquake fault[J]. Chinese Journal of Geophysics (in Chinese), 2011, 54(7): 1805-1816, doi: 10.3969/j.issn.0001-5733.2011.07.014 |
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| Authors: | CHEN Jian-Ye YANG Xiao-Song DANG Jia-Xiang HE Chang-Rong ZHOU Yong-Sheng MA Sheng-Li |
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| Affiliation: | State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China |
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| Abstract: | Cross-fault permeability measurement was conducted on the Wenchuan earthquake fault. The results showed that this earthquake fault consists of fault core with low permeability (2.4×10-19 -3.8×10-16 m2), highly permeable damaged zone (3.7×10-16 -3.0×10-15 m2) and the fractured protolith (6.0×10-18 -4.3×10-13 m2) (40 MPa effective pressure), among which fresh gouges on the main slip surface are the most impermeable. Impeded by the impermeable protolith and fault gouge, cross-fault fluid flow was inhibited and fluid activity was confined within the damaged zone. This recognition is consistent with microstructure and grain size distribution of fault rocks. Condition of co-seismic thermal pressurization was calculated and the results showed that at depth greater than 2 km, the main slip zone of Wenchuan earthquake has the characteristics of low permeability for thermal pressurization to occur. |
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| Keywords: | Wenchuan earthquake Earthquake fault Permeability High-pressure fluid Thermal pressurization |
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