Multi-source multi-receiver microseismic reflection imaging: case study Basel

Abstract

In this paper Microseismic Reflection Imaging (MRI) approach is applied to the high quality microseismic data from the stimulation of Enhanced Geothermal System (EGS) at Basel. Microseismic waveforms recorded at a number of downhole stations are analysed and the presence of reflections is revealed. The MRI approach is applied to the data recorded at two different borehole instruments: 2.5 km and 4.3 km away from the injection interval. The results complement each other and represent the detailed high resolution fracture map of the reservoir in the vicinity of the microseismic cloud. In addition to the standard sections of the images, the 3D structure of the first order cracks is shown. A possible joint interpretation of the obtained images and the event location is presented.