Variation of Drilling Mud Gas Components at 350～800 m Interval of No.2 Borehole of Scientific Drilling for Wenchuan Seismic Faulted Zone
详细信息
- 责任者：Liu Shubo (College of Earth Science and Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Tang Lijun
- 刊名：Geophysical and Geochemical Exploration
- 出版年：2012
- 卷期：36(1)
- 关键词：地下流体 ; underground fluids ; 汶川地震2008 ; Wenchuan earthquake 2008 ; 龙门山断裂带 ; Longmenshan Fault Zone
- 页码：p.48-53
- 图表：4 illus., 4 tables, 21 refs.
- 分类号：0500
- 出版序号：20130076
- issnNo：ISSN1000-8918
- isbnNo：CN11-1906/P
摘要
///Based on data of some gas components in drilling mud at 350～800 m interval of No.2 borehole for WFSD and Richter earthquake magnitude ML≥3.5 catalog as well as lithologic character of cores from the faulted zone of Wenchuan earthquake 2008,the authors investigated the relationships of anomalies of drilling mud degas gaseous components to tectonic environment and earthquake activity.The results show that the shattering of rocks is maximum at the interval of 660～680 m,the normalized values of various gases also show obvious positive and negative anomalies,and the intervals corresponding to the maximum and minimum values are places where aftershocks higher than the magnitude MS 3.0 frequently occur.The gas anomalies mostly occur in cracks in rocks,surface of fractures and faults.
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