Cristin-resultat-ID: 1809145
Sist endret: 11. november 2020, 16:12
NVI-rapporteringsår: 2020
Resultat
Vitenskapelig artikkel
2020

Layering in shales controls microfracturing at the onset of primary migration in source rocks

Bidragsytere:
  • Thomas Chauve
  • Luc Scholtes
  • Frédéric-Victor Donzé
  • Nazmul Haque Mondol og
  • Francois Renard

Tidsskrift

Journal of Geophysical Research (JGR): Solid Earth
ISSN 2169-9313
e-ISSN 2169-9356
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2020
Volum: 125
Hefte: 5
Artikkelnummer: e2020JB019
Open Access

Importkilder

Scopus-ID: 2-s2.0-85085316977

Beskrivelse Beskrivelse

Tittel

Layering in shales controls microfracturing at the onset of primary migration in source rocks

Sammendrag

The process of primary migration, which controls the transfer of hydrocarbons from source to reservoir rocks, necessitates the existence of fluid pathways in low permeability sedimentary formations. Primary migration starts with the maturation of organic matter that produces fluids which increase the effective stress locally. The interactions between local fluid production, microfracturing, stress conditions, and transport remain difficult to apprehend in shale source rocks. Here, we analyze these interactions using a coupled hydro‐mechanical numerical model based on the discrete element method. The model is used to simulate the effects of fluid production emanating from kerogen patches contained within a shale rock alternating kerogen‐poor and kerogen‐rich layers. We identify two microfracturing mechanisms that control fluid migration: i) propagation of hydraulically driven fractures induced by kerogen maturation in kerogen‐rich layers, and ii) compression induced fracturing in kerogen‐poor layers caused by fluid overpressurization of the surrounding kerogen‐rich layers. The relative importance of these two mechanisms is discussed considering different elastic properties contrasts between the shale layers, as well as various stress conditions encountered in sedimentary basins, from normal to reverse faulting regimes. The layering in shales causes local stress redistribution that controls the prevalence of each mechanism over the other and the onset of microfracturing during kerogen maturation. Results are applied to the Draupne formation, a major source rock in the Norwegian continental shelf in the North Sea.

Bidragsytere

Thomas Chauve

  • Tilknyttet:
    Forfatter
    ved Institutt for geofag ved Universitetet i Oslo
  • Tilknyttet:
    Forfatter
    ved NJORD geofag - senter for studier av jordens fysikk ved Universitetet i Oslo

Luc Scholtes

  • Tilknyttet:
    Forfatter
    ved Université de Lorraine

Frédéric-Victor Donzé

  • Tilknyttet:
    Forfatter
    ved Université Grenoble Alpes

Md Nazmul Haque Mondol

Bidragsyterens navn vises på dette resultatet som Nazmul Haque Mondol
  • Tilknyttet:
    Forfatter
    ved Integrerte geofag ved Norges Geotekniske Institutt
  • Tilknyttet:
    Forfatter
    ved Institutt for geofag ved Universitetet i Oslo

Francois Renard

  • Tilknyttet:
    Forfatter
    ved Institutt for geofag ved Universitetet i Oslo
  • Tilknyttet:
    Forfatter
    ved NJORD geofag - senter for studier av jordens fysikk ved Universitetet i Oslo
  • Tilknyttet:
    Forfatter
    ved Université Grenoble Alpes
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