METHOD EXPLORING OF THE RESIDUAL FRICTION THERMAL ANOMALY MEASUREMENT: A CASE STUDY ABOUT THE TEMPERATURE MEASUREMENT IN WFSD-1
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摘要: 以汶川地震断裂带科学钻探工程WFSD-1钻孔高精度相对温度梯度测量确定汶川地震断层为例，探讨了地震断裂带断层摩擦残余热温度测量方法。利用WFSD-1钻孔相对温度梯度温度测量取得的科学数据进行分析，发现在400~500 m、580~610 m及620~750 m三个测量段内存在温度正异常。结合地质资料综合分析，判定400~500 m、620~750 m段温度异常可能由地层热导率差异引起，并非断层摩擦残余热异常，判定位于不透水断层泥中温度异常深度580~610 m范围为断层主滑移带位置。Abstract: In WFSD-1 borehole of the Wenchuan earthquake fault scientific drilling project, we conducted relative temperature gradient high-precision measurements and obtained large numbers of field data. In this paper, the friction residual heat temperature measuring method is discussed in detail and the position of Wenchuan earthquake fault zone is detected after field datum analyzing. We found three temperature anomalies in 400~500 m, 580~610 m and 620~750 m, respectively. Take geological data into comprehensive account, the two section's temperature anomalies may be caused by discrepancy of thermal conductivity in 400~500 m and 620~750 m and they aren't the residual frictional thermal anomalies. The section of the anomaly from nonpermeable fault clay in interval of 580~610 m may be resulted from friction heat generation during Wenchuan earthquake, and it located in the primary slip fault zone.
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图 6 BBT-01型探管测温异常曲线
Figure 6. Abnormal contrast curve of Shanghai temperature probe and development probe
图 7 WFSD-1温度异常及地层构造剖面对照图
Figure 7. Comparison of temperature anomaly and strata tectonic section in WFSD-1
图 8 WFSD-1多次测量温度及断层摩擦温度异常曲线
Figure 8. Temperature anomaly curve of the fault friction and temperature measurements in WFSD-1
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