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水压裂缝技术是一种重要的强化油气采收、地热能开发和固体废料处置的方法。而水压裂缝带几何形态和增长过程的确定对于监测和评价地下裂缝是很重要的。为了估计劳斯阿拉摩斯热干岩(HDR)地热工地水压裂缝引起的一串157个微地震的相对震源位置,我们研究了一种基于波形相干和网格搜索法的相对震源定位方法。在157个事件中,147个微地震在40m长的范围内以致密的一串出现,大致定义了垂直水压裂缝带的方位为N40°W。估计裂缝带的长、高和宽分别为40m、35m和5m。对诱发微地震的时—空模式所作的分析揭示,裂缝带在两个小时内以每分钟0.2m的平均速度沿裂缝带走向朝着北西方向增长。
Hydraulic fracturing is an important method of enhancing oil and gas recovery, geothermal energy development and solid waste disposal. The determination of hydraulic fracture geometry and growth process is very important for monitoring and evaluating underground fractures. To estimate the relative hypocenter locations of a string of 157 microseismic events caused by hydraulic fractures at the geothermal site of the Rouslam Alamos (HDR) geothermal site, we investigated a relative source localization method based on waveform coherence and grid search. Of the 157 events, 147 micro-earthquakes occurred in a dense string over a 40-m length, broadly defining the vertical hydraulic fractured zone as oriented at N40 ° W. The length, height and width of the fracture zone are estimated to be 40 m, 35 m and 5 m, respectively. An analysis of the time-space pattern that induced microseismicity revealed that the fractured zone propagated northwest along the fracture zone at an average velocity of 0.2 m / min within two hours.