Skip to Main Content
GEOREF RECORD

Microseismic reflection imaging and its application to the Basel geothermal reservoir

Anton Reshetnikov, Joern Kummerow, Hiroshi Asanuma, Markus Haering and Serge A. Shapiro
Microseismic reflection imaging and its application to the Basel geothermal reservoir
Geophysics (November 2015) 80 (6): WC39-WC49

Abstract

We have developed a new approach for reflection seismic imaging using microseismic waveform data. We took the specific character of microseismic downhole data into account and were able to image regions in the direct vicinity or inside of a seismically active zone. We used a directional migration method that reduced imaging artifacts caused by the low aperture of the data, but required estimation of the wavefield polarization. We also used hodogram analysis to identify parts of data that provided reliable polarization estimates. Only these parts were then used for imaging, whereas the rest of the data are excluded. The approach was successfully applied to microseismic waveforms recorded during and after the stimulation of the enhanced geothermal system in Basel, Switzerland. This data set included more than 2000 events recorded at five sparsely distributed borehole sensors. The reflection images revealed a distinct network of reflectors in the vicinity of the open hole section within the injection well. The results were compared with the injection borehole ultrasonic image revealing a quite good agreement. Combined analysis of imaged reflectors, event locations, and event focal mechanisms indicated that the approach resolved mostly aseismic highly permeable fluid pathways, whereas most of the seismicity occurred in the second-order fractures.


ISSN: 0016-8033
EISSN: 1942-2156
Coden: GPYSA7
Serial Title: Geophysics
Serial Volume: 80
Serial Issue: 6
Title: Microseismic reflection imaging and its application to the Basel geothermal reservoir
Affiliation: Freie Universitaet Berlin, Berlin, Germany
Pages: WC39-WC49
Published: 201511
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 28
Accession Number: 2015-115136
Categories: Applied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N45°45'00" - N47°45'00", E05°49'60" - E10°30'00"
Secondary Affiliation: Hirosaki University, JPN, JapanGeo Explorers, CHE, Switzerland
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 201549
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal