ZHANG Bin,
LIU YaoWei,
FANG Zhen et al
.2018.Relationship between concentrations of hydrogen and mercury of No.2 hole cores at the Wenchuan Earthquake Scientific Drilling and fault zone structure.Chinese Journal Of Geophysics,61(5): 1771-1781,doi: 10.6038/cjg2018M0117
1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China; 2. Key Laboratory of Crustal Dynamics, Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China; 3. Anhui Earthquake Administration, Hefei 230031, China; 4. Sichuan Earthquake Administration, Chengdu 610041, China
Abstract：Taking the WFSD-2 drill hole as the research object, we analyzed the characteristics of hydrogen (H2) and mercury (Hg) concentrations in the drilling mud. In the vertical direction, there was significant non-uniformity, and there were multiple sections of abnormally high values. The research shows that (1) the abnormal concentrations of H2 and Hg have a notable relationship with secondary faults and the properties of rock structure, and high-value anomalies are caused by the channel migration of fault zones or fractured zones. (2) The characteristics of H2 and Hg concentrations in the mud collected while drilling indicate the position of the main slip zone in the WFSD-2 drilling of the Wenchuan earthquake, implying that the study on the characteristics of the mud fluid collected while drilling is one of the approaches to identify underground fissure zones, fractured zones or fault zones. (3) Abnormal concentrations of H2 and Hg may also be related to strong seismic activity at the boundary of the tectonic block and moderate seismic activity in the near-field of the fault zone. The results of this study provide evidence on geochemical characteristics of H2 and Hg for the analysis of deep fluid activity during large earthquakes, and also serve as an important reference for the study on the mechanism of earthquake precursors.
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