Cristin-resultat-ID: 1605760
Sist endret: 17. februar 2019, 13:53
NVI-rapporteringsår: 2018
Resultat
Vitenskapelig artikkel
2018

Experimental investigation of injection pressure effects on fault reactivation for CO2 storage

Bidragsytere:
  • Pierre Cerasi
  • Anna Magdalena Stroisz
  • Eyvind Frode Sønstebø
  • Sergey Stanchits
  • Volker Oye og
  • Robert Bauer

Tidsskrift

International Journal of Greenhouse Gas Control
ISSN 1750-5836
e-ISSN 1878-0148
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2018
Publisert online: 2018
Trykket: 2018
Volum: 78
Sider: 218 - 227

Importkilder

Scopus-ID: 2-s2.0-85052454046

Beskrivelse Beskrivelse

Tittel

Experimental investigation of injection pressure effects on fault reactivation for CO2 storage

Sammendrag

Laboratory tests were conducted in a triaxial load frame with acoustic emission and transmission capability to investigate mechanisms that might be initiating the microseismicity experienced in CO 2 injection operations. Although often related to reactivation of mapped faults or local fracturing due to reduced injectivity, the case of the Illinois Basin – Decatur Project is used here to illustrate the need for better understanding of what triggers microseismic events in relatively large permeability, good reservoir candidates. There, microseismicity has oc- curred in the CO 2 storage target formation, the Mt. Simon sandstone, as well as in the underlying Precambrian basement. The microseismicity in the Mt. Simon sandstone occurred ahead of CO 2 plume arrival and at relatively low injection pressure conditions, well below the fracturing pressure at the injection well. A hypothesis is suggested for the occurrence of such events in the field, whereby critically stressed planes are activated by the passage of the pressure front at injection start; these faults are small and thus not visible in the seismic survey. In order to test this hypothesis, sandstone plugs were prepared by two different methods to incorporate a fracture plane, which we attempted to reactivate by pore pressure pulses. The reactivation was successful at low pressure for a fracture created in the laboratory at reservoir conditions but was unsuccessful except at a much higher pore pressure in a saw-cut artificial fracture. The results suggest that tortuous, rough stress-induced fractures may be easier to reactivate because of the higher probability that sections are already favorably oriented with respect to critical shear stress at a low pore pressure increase. Saw-cut fractures may close completely under isotropic stress loading and may be difficult to activate unless exactly oriented with respect to critical shear stress at a low pore pressure increase. Acoustic emission accompanying fracture reactivation was also recorded and analyzed. This revealed a di fferent event distribution energy between creating and reactivating the fracture

Bidragsytere

Pierre Cerasi

  • Tilknyttet:
    Forfatter
    ved Anvendt geovitenskap ved SINTEF AS

Anna Magdalena Stroisz

  • Tilknyttet:
    Forfatter
    ved Anvendt geovitenskap ved SINTEF AS

Eyvind Frode Sønstebø

  • Tilknyttet:
    Forfatter
    ved Anvendt geovitenskap ved SINTEF AS

Sergey Stanchits

  • Tilknyttet:
    Forfatter
    ved USA

Volker Oye

  • Tilknyttet:
    Forfatter
    ved NORSAR
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