Shear tensile-implosion source model vs. moment tensor: benefit in single-azimuth monitoring, Cotton Valley set-up

0387200 - GFÚ 2013 RIV NL eng C - Conference Paper (international conference)
Šílený, Jan
Shear tensile-implosion source model vs. moment tensor: benefit in single-azimuth monitoring, Cotton Valley set-up.
74th EAGE conference & exhibition incorporating SPE EUROPEC 2012. Houten: EAGE, 2012, D021/1-D021/5. ISBN 978-90-73834-27-9.
[EAGE Conference & exhibition incorporationg SPE EUROPEC 2010 /74./. Copenhagen (DK), 04.06.2012-07.06.2012]
R&D Projects: GA ČR GAP210/12/2235
Institutional support: RVO:67985530
Keywords : hydrofracturing of oil-gas wells * monitoring by underground sensors in boreholes * non-double-couple mechanisms
Subject RIV: DC - Siesmology, Volcanology, Earth Structure

Moment tensor (MT) has become a standard for description of seismic sources, both in earthquake seismology and for various types of induced seismicity. It is a general dipole source, but for practice it may be too general, its generality causing troubles during its reconstruction from noisy data in the inverse process, which may be additionally ill-conditioned due to inexact hypocenter location or availability of a rough velocity/attenuation model only. Then, the retrieved source may be biased. It seems reasonable to assume a simpler source model directly describing the physical phenomena anticipated in the particular focus. A simple combination of a shear slip with tensile crack or 1D implosion (STI) may be a good model both for natural earthquakes and induced events. The model simplification introduced is crucial in cases of depleted sensor configuration when the moment tensor fails, in single-azimuth monitoring in particular. This is just the case of application in oil and gas industry, where the monitoring of seismicity induced by hydrofracturing is typically performed from single monitoring borehole.
Permanent Link: http://hdl.handle.net/11104/0216336