Downhole microseismic recording with lower noise, higher sensitivity and broader bandwidth

We have developed a new multilevel seismic downhole array for the purpose of ambient seismic noise measurements. The tool substantially widens the bandwidth and lowers the detection threshold for microseismic events at low signal-to-noise levels near the ambient seismic noise floor. We analyse the bandwidth requirements in both frequency and dynamic range needed for accurate determination of dynamic source properties of microseismic events, such as the seismic moment tensor and event stress drop and compare them with the designed capabilities of this new tool.