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WFSD-4S孔流体地球化学特征

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劳昌玲, 唐力君, 罗立强, 夏瑜, 龚正. WFSD-4S孔流体地球化学特征[J]. 中国地质, 2016, (5): 1721-1728. doi: 10.12029/gc20160520
引用本文: 劳昌玲, 唐力君, 罗立强, 夏瑜, 龚正. WFSD-4S孔流体地球化学特征[J]. 中国地质, 2016, (5): 1721-1728. doi: 10.12029/gc20160520
shu
LAO Chang-ling, TANG Li-jun, LUO Li-qiang, XIAYu, GONG Zheng. Geochemical features in Drill Hole WFSD-4S[J]. Geology in China, 2016, (5): 1721-1728. doi: 10.12029/gc20160520
Citation: LAO Chang-ling, TANG Li-jun, LUO Li-qiang, XIAYu, GONG Zheng. Geochemical features in Drill Hole WFSD-4S[J]. Geology in China, 2016, (5): 1721-1728. doi: 10.12029/gc20160520
shu

WFSD-4S孔流体地球化学特征

  • 1.

    中国有色桂林矿产地质研究院有限公司, 广西 桂林 541004;中国地质科学院国家地质实验测试中心, 北京 10037;中国地质大学(武汉), 湖北 武汉 430074

  • 2.

    中国地质科学院国家地质实验测试中心, 北京 10037

  • 3.

    中国有色桂林矿产地质研究院有限公司, 广西 桂林 541004

  • 4.

    中国地震局地球物理研究所, 北京 100081

Geochemical features in Drill Hole WFSD-4S

  • 1.

    China Nonferrous Metals(Guilin) Geology and Mining Co., Ltd., Guilin 541004, Guangxi, China;National Research Center for Geoanalysis, Chinese Academy of Geological Sciences, Beijing 100037, China;China University of Geosciences(Wuhan), Wuhan 430074, Hubei, China

  • 2.

    National Research Center for Geoanalysis, Chinese Academy of Geological Sciences, Beijing 100037, China

  • 3.

    China Nonferrous Metals(Guilin) Geology and Mining Co., Ltd., Guilin 541004, Guangxi, China

  • 4.

    Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

    摘要
  • 本文开展汶川地震断裂带科学钻探现场流体研究，探讨了泥浆添加剂产生的化学反应以及钻孔中岩性变化引起的流体异常特征，并在排除这些影响因素的情况下，讨论地震期间流体的异常。研究表明在WFSD-4S钻进期间发生的两次较大地震前均伴有Rn、Ar、N2和O2等气体异常现象，其中氡的日均值均超出背景值的2.5倍。根据岩心观察得到WFSD-4S钻井地区主断层约在1084 m，而在断层之上931 m处开始出现了大量气体的高值异常，该异常可能是由于地震孕育过程中地下气体的运移通道被打开造成气体向上迁移，使断层气体的响应特征提前发生。
    This paper deals with the in-site real-time fluid analysis in the drill hole WFSD-4S. The abnormal fluid during the earthquake was discussed after excluding the influence of chemical reaction affected by mud additives and anomaly characteristics caused by lithologic changes. The research shows that two strong earthquakes were accompanied by abnormal occurrence of Rn, Ar, N2 and O2 in WFSD-4S. What deserves attention is the daily average concentrations of radon were over 2.5 times higher than the background value. The mud gas yielded high concentrations above Principal Slip Zone (PSZ) in 931 m,which should appear in 1084m through the lithology investigation. It is inferred that the underground gas migration channel was opened and gas migrated upward because of the earthquake preparation process, which resulted in anticipating the response characteristics of fault gases.
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出版历程
收稿日期:  2016-07-19
修回日期:  2016-08-24
刊出日期:  2016-10-24

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