| 美国北加州吉塞尔斯诱发地震与热汽田特征的关系 |
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| 引用本文： | 王汝兵,王兰生.美国北加州吉塞尔斯诱发地震与热汽田特征的关系[J].地质灾害与环境保护,1994,5(3):8-14. |
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| 作者姓名： | 王汝兵 王兰生 |
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| 作者单位： | 成都理工学院工程地质研究所!成都610059 |
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| 摘 要： | 吉塞尔斯地震活动可能是因蒸汽开发引起的.水在一个承受很高构造剪应力和应变的大范围破裂体中汽化为蒸汽。 汽田地震震源机制解与区域构造应变场几乎一致,并且在该区域范围内汽田地震与别的构造地震不易区分。观测中注意到地震活动与注液历史无关,这表明孔隙水压力增高与注液不可能是吉塞尔斯诱发地震的成因。 相反,所有证据都表明诱发地震与孔隙水压力及温度降低有关。形成机制有两种最大可能:其一,是裂隙排水(汽)导致局部剪应力增加所致,其二,是由稳定滑动转化为不稳定滑动(粘滑)。没有其它记载的诱发地震机制与吉塞尔斯汽田条件相符。
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| 关 键 词： | 热汽田 汽田特征 诱发地震 |
RESERVIOR CONDITIONS RELATED TO INDUCED SEISMICITY AT THE GERSERS STEAM RESERVIOR, NORTH CALIFONIA |
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| By Roger P. Denlinger And Charles G. Bufe.RESERVIOR CONDITIONS RELATED TO INDUCED SEISMICITY AT THE GERSERS STEAM RESERVIOR, NORTH CALIFONIA[J].Journal of Geological Hazards and Environment Preservation,1994,5(3):8-14. |
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| Authors: | By Roger P Denlinger And Charles G Bufe |
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| Institution: | By Roger P. Denlinger And Charles G. Bufe |
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| Abstract: | Seismicity at the Gersers appears to be induced by steam production, in which water boils to steam within a pervasively stractured reservior subject to high levels of tectonic shear stress and strain.Reservior earthquake focal mechanisms are nearly aligned with the regional tectonic strain field,and reservior earthquakes are indistinguishable from tectonic earthquakes elsewhere in the region.Added to the zero correlation of fluid injection history with the earthquake activity, all available evidence suggest that the elevated pore pressure and fluid injection are not likely causes for the Gersers induced seismicity.Instead all available evidence points to the association of induced seismicity with pore pressure and temperature declines. The two most likely mechanisms are either an increase in local sheay stress levels with fissure defation. or a transition from stable to unstable sliding ("stick -slip"). No other documented mechanism for induced seismicity are consistent with in situ reservoir conditions at the Gersers. |
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| Keywords: | Steam reservior Reservior condition Induced seismicity Mechanism |
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