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

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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.