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首页> 外文期刊>Geoscience journal >Real-time hydrogen mud logging during the Wenchuan earthquake fault scientific drilling project (WFSD), holes 2 and 3 in SW China
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Real-time hydrogen mud logging during the Wenchuan earthquake fault scientific drilling project (WFSD), holes 2 and 3 in SW China

机译：汶川地震故障科学钻井项目（WFSD），SW中国的实时氢气测井

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摘要

We present hydrogen gas concentration data for drilling mud extracted during the Wenchuan Earthquake Fault Scientific Drilling (WFSD; holes 2 and 3), measured on-line during drilling in SW China. Hydrogen influx into the well at depth is largely dependent on lithology and fracture density. In hole WFSD-2, the average background concentration of hydrogen is lower in granitic rocks than in sedimentary formations. More than five major hydrogen influxes were detected while drilling through the sedimentary formations, and two hydrogen-rich zones were detected in the granite (1240-1243 m and 1383.5-1405 m depth). In hole WFSD-3, mud extracted from a tectonic breccia contains high hydrogen concentrations at depths of 600-1000 m depth, and relatively low concentrations below 1000 m depth. In both holes, we observe a lack of hydrogen in the center of the fault zone and high concentrations of hydrogen in fractured zones. Hydrogen concentration in both holes displays significant vertical heterogeneity, and is positively correlated with fracture density. Hydrogen was likely sourced from interaction between water and fresh silicate minerals surfaces that were exposed during faulting, from the mantle, and from faulting events. Fracture zones provide the main channels for the migration of hydrogen gas. The variations in background hydrogen concentrations relate to changes in porosity and permeability. The two hydrogen-rich zones (642.36-676.22 m, and 1383.5-1405 m) were likely caused by earthquake activity or far-field triggering during WFSD-2 drilling. The results of this study provide gas data that can be used to model fault activity. It is important to consider the relationship between hydrogen gas and the seismic cycle, and to use such data to identify seismic precursors.
机译：我们在汶川地震故障科学钻井（WFSD;孔2和3）中提取钻井泥浆的氢气浓度数据，在SW中国钻探期间在线测量。氢气流入井中深度在很大程度上取决于岩性和断裂密度。在孔WFSD-2中，氢的平均背景浓度在花岗岩岩石中低于沉积形成。通过沉积地层钻探的同时检测到超过五个主要氢气涌入，并在花岗岩（1240-1243m和1383.5-1405m深度）中检测到两个富含氢气的区域。在孔WFSD-3中，从构造Breccia中提取的泥浆含有高氢浓度，深度为600-1000米深度，浓度低于1000米的深度。在两个孔中，我们在断层区域的中心和骨折区域中缺乏氢气缺乏氢气。两个孔中的氢浓度显示出显着的垂直异质性，并且与断裂密度呈正相关。氢气可能来自水和新鲜硅酸盐矿物表面之间的相互作用，这些硅酸盐矿物表面在断层期间从地幔中露出，并从地幔中脱落。骨折区域为氢气迁移提供主干道。背景氢浓度的变化涉及孔隙率和渗透性的变化。两种富含氢气的区域（642.36-676.22 m和1383.5-1405 m）可能是由WFSD-2钻井期间的地震活动或远场触发引起的。该研究的结果提供了可用于模拟故障活动的气体数据。重要的是要考虑氢气和地震循环之间的关系，并使用这些数据来识别地震前体。

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  • 来源
    《Geoscience journal》 |2018年第3期|共12页
  • 作者

    Fang Zhen; Liu Yaowei; Yang Duoxing; Guo Lishuang; Zhang Lei;

  • 作者单位

    China Earthquake Adm Inst Crustal Dynam Key Lab Crustal Dynam Anningzhuang Rd 1 Beijing 100085 Peoples R China;

    China Earthquake Adm Inst Crustal Dynam Key Lab Crustal Dynam Anningzhuang Rd 1 Beijing 100085 Peoples R China;

    China Earthquake Adm Inst Crustal Dynam Key Lab Crustal Dynam Anningzhuang Rd 1 Beijing 100085 Peoples R China;

    China Earthquake Adm Inst Crustal Dynam Key Lab Crustal Dynam Anningzhuang Rd 1 Beijing 100085 Peoples R China;

    China Earthquake Adm Inst Crustal Dynam Key Lab Crustal Dynam Anningzhuang Rd 1 Beijing 100085 Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;
  • 关键词

    hydrogen; WFSD; fracture structure; high value anomalies; earthquake;

    机译：氢;WFSD;裂缝结构;高价值异常;地震;

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