差干井同震井喷现象的调查与分析
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摘要
差干井在2004年12月26日印尼MS8.7地震时发生强烈井喷,喷柱高达60m。调查与分析结果表明,井喷是在特定的井区水文地质条件下,富含CO2气体的观测含水层地下水受到地震波的扰动,一方面使大量吸附气被释放,另一方面使游离气泡被打碎,导致地下水被"汽"化,从而使含水层孔隙压力剧增引起的。
Violent blowouts occurred in Chagan Well when the MS 8.7 Sumatra earthquake happened on Dec.26,2004,with the eruptive fountain up to 60m high.The result of investigation and analysis of Chagan well indicates that blowout occurred in the condition of special hydrogeology.The water of monitoring layer was rich of CO2.When the aquifer of monitoring was disturbed by the earthquake wave,a large number of absorbed gases were released.On the other hand,free bubble was broken by the earthquake wave and the groundwater was gasified,leading to the rapid increase of the pore pressure.
Violent blowouts occurred in Chagan Well when the MS 8.7 Sumatra earthquake happened on Dec.26,2004,with the eruptive fountain up to 60m high.The result of investigation and analysis of Chagan well indicates that blowout occurred in the condition of special hydrogeology.The water of monitoring layer was rich of CO2.When the aquifer of monitoring was disturbed by the earthquake wave,a large number of absorbed gases were released.On the other hand,free bubble was broken by the earthquake wave and the groundwater was gasified,leading to the rapid increase of the pore pressure.
引文
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刘耀炜,杨选辉,刘永铭,等.2005.地下流体对苏门答腊8.7级地震的响应特征[A].见:中国地震局监测预报司编.2004年印度尼西亚苏门答腊8.7级大地震及其对中国大陆地区的影响.北京:地震出版社.131—258.LIUYao-wei,YANG Xuan-hui,LIUYong-ming,et al.2005.Character of underground fluid response to theMS8.7Su-matra Earthquake[A].In:Monitoring and Prediction Department of CEA(ed).Sumatra EarthquakeMS8.7inIndonesia,2004and Its Influence to Mainland of China.Seismological Press,Beijing.131—258(in Chinese).
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Roeloffs E A.1998.Persistent water level changes in a well near Parkfield California due to local and distant earth-quakes[J].J Geophys Res,103(B1):869—889.
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