Estimation of dynamics in a subsurface fracture reservoir by means of proximity microseismic doublets analysis

邻近微震双重波是发生波形重叠的类似微震事件。由于这些相似的、重叠的微地震事件的相对位置不受速度结构变化的影响，分析这些微地震事件可以提供精确的相对震源位置。我发明了一种时间-频率分析方法可以探测到纵波之间的精确间隔。应用MUSIC分析方法检测它们的间隔。MUSIC分析提供了高分辨率的接近相似事件之间的间隔。我分析了在Soultz干热岩田水力压裂过程中测量到的邻近微地震偶波。我定位了9个相邻的微震双峰。我确定了邻近微震双重震源之间的相对位置。开发了一种震源和声发射源相对位置的多界面可视化系统。可视化系统可以同时显示储层的整体图像和声发射源之间的精细结构，从而分析地热储层的特征属性。

Proximity microseismic doublets are similar microseismic events that occur with overlapping waveforms. Analysis of such similar, overlapping microseismic events can provide precise relative source locations of those events because their relative location is not affected by change of velocity structure. I developed time-quefrency analysis that can detect precise interval between P-waves. MUSIC analysis is applied to detect their interval. MUSIC analysis provides interval between proximity similar events in high resolution.I analyzed proximity microseismic doublets that were measured during a hydraulic fracturing at the Soultz hot dry rock field. I located nine proximity microseismic doublets. I determined relative location between their sources of the proximity microseismic doublets.A multiple interface visualization system for hypocenters and relative locations of AE sources are developed. The visualization system shows simultaneously the whole image of the reservoir and fine structures between AE sources so that we can analyze characteristic properties of the geothermal reservoir.