Record details

Title
    Samples of Hot Dry Rock Soultz injection microearthquakes - mechanism using alternative source models
Author
    Jechumtálová, Zuzana
    Šílený, Jan
Conference
    EAGE Conference & exhibition incorporationg SPE EUROPEC 2010 (74. : 04.06.2012-07.06.2012 : Copenhagen, Dánsko)
Language
    anglicky
Publication type
    konferenční příspěvek (zahraniční konference)
Source title - monograph
    74th EAGE conference & exhibition incorporating SPE EUROPEC 2012
Pages
    D022/1-D022/5
Notes
    Projekt: GAP210/10/1728, GA ČR3cav_un_auth*0263509
    Rozsah: 5 s. : C
Subject category
    comparison of MT and STI models
    geothermal reservoir
    induced microearthquakes
Keyword
    Alternative
    Dry
    Hot
    Injection
    Mechanism
    Microearthquakes
    Models
    Rock
    Samples
    Soultz
    Source
    Using
Abstract (in english)
   The geothermal reservoir at Soultz-sous-Forets is a valuable natural laboratory for understanding the mechanisms of the microearthquakes generated during stimulations and circulation tests. There is an ongoing effort towards the retrieval of the mechanisms though the indication of the type of fracturing of the rock massif still remains ambiguous. Recent studies indicate prevailingly shear slip but rarely there is also observed a non-shear pattern. Moment tensor - used today as a universal tool for description of the mechanism - captures general balanced dipole sources. However, for practice it may be too general as it may include also non-physical sources. Opening new fractures can be described in the first approximation by a tensile crack, optionally combined with a shear slip. We call this alternative model a shear-tensile/implosion source model.
   From the bulk of the seismicity recorded during stimulation in 2003, we concentrted on the first phase of the injection when only a single borehole in the site was stimulated.
Contributor
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
    U
Import date
    9. 12. 2013