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《Earthquake》 2005-01
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Geochemistry of some fluid compositions in the mud of CCSD main well and their relations to seismicity

SUN Qing,LI Sheng-qiang ,LUO LI-qiang(Institute of Rock and Mineral Analysis,Chinese Academy of Geological Sciences, Beijing 100037; Institute of Earthquake Science, CEA, Beijing 100036, China)  
The concentrations of some fluid compositions such as He, Ar, CO2 and CH4 in the mud of CCSD main well at depths between 100 and 2045m are collected and analyzed in this paper. To study the relationship between the anomalous variations of fluids and seismic activities within the focus area, the authors have obtained and compiled seismic catalogues with magnitude over 1. 0 in the period of July 1, 2002-April 30, 2002. The concentrations of these fluid components (He, Ar, CO2 and CH4) are analyzed and processed using the daily statistics, the calculus of difference and the maximum coefficient of correlation of CO2-CH4. It is indicated from these results that the anomalous variation occurs before or after seismic activity. From the features of some fluid composition in the CCSD main well and the seismic activity at CCSD site within the radius if 500 km, it can be concluded that the features of fluids in the main well were possibly responsible for seismic activity.
【Fund】: "九五"国家重大科学工程项目"中国大陆科学钻探工程" 国家自然科学基金重大项目(40399144) 国家重点基础研究发展规划项目(2003CB716508)
【CateGory Index】: P315.724
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