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Detection of microseismic events from borehole and surface data towards a common catalog



Microseismic monitoring from borehole and surface receiver arrays at the same time provide two different perspectives on a reservoir but may lead to unequal results that may affect the final interpretation. We currently work with a data set that consists of simultaneously recorded borehole and surface data from hydraulic fracturing. We also have catalogs of event positions and origin times that only show few coinciding event locations and detection times, respectively. Our aim is to detect microseismic events in both data sets and to find corresponding detections in each of the other data set. For borehole data we use the standard short-term to long-term average (STA/LTA) analysis. For surface data we construct moveout curves for the most coherent signals along which the STA/LTA traces are stacked. Events are detected where the stacked traces exceed a predefined threshold value. The moveout parameter are directly estimated from the data without the need of additional information on the velocity structure or time-consuming picking. For each detection, we look for a coinciding detection in the other data set at corresponding times. This way we obtain a list of coinciding detections from the surface and the borehole data, respectively, that can further be used for joint analysis of simultaneously recorded surface and borehole data.

Presentation Date: Tuesday, September 17, 2019

Session Start Time: 8:30 AM

Presentation Start Time: 10:35 AM

Location: 303B

Presentation Type: Oral