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Titre: | Estimation of horizontal stresses from wellbore failures in strike-slip tectonic regime: A case study from the Ordovician reservoir of the Tinzaouatine field, Illizi Basin, Algeria |
Auteur(s): | Baouche, Rafik Sen, Souvik Hadj Arab, Feriel Ahmed, Radwan |
Mots-clés: | Horizontal stresses Ordovician reservoir Tinzaouatine field Illizi Basin, Algeria |
Date de publication: | 2022 |
Editeur: | Society of Exploration Geophysicists |
Collection/Numéro: | Interpretation/Vol. 10, N°3 (August 2022);pp. 37–44 |
Résumé: | We present a geomechanical analysis of the Ordovician reservoir from the Tinzaouatine field
situated in the prolific Illizi Basin, eastern Algeria. The sandstone reservoir has a hydrostatic pore pressure gra-
dient (9.95 MPa/km). We analyzed a cumulative of 300 m of acoustic image log data and identified the coexistence
of B-quality extensive drilling-induced tensile failures (DITFs) and compressive failures, i.e., breakouts (BOs),
indicating a mean maximum horizontal stress (SHMax) orientation of N140°E. We used a combined BO and
DITF-based solution to estimate horizontal stress magnitudes when the two failure types coexist. Based on
the C-quality minifrac measurements, we interpreted the minimum horizontal stress (Shmin) gradient as
17.4–17.47 MPa/km, whereas the new approach indicates an Shmin range of 17.31–18.67 MPa/km. Using the
BO width and DITF-based approaches, we inferred an SHMax gradient range of 28.37–38.59 MPa/km within
the studied reservoir. Based on the relative stress magnitudes, we infer a strike-slip tectonic stress regime in
the studied field. |
URI/URL: | DOI:10.1190/int-2021-0254.1 http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/12063 |
ISSN: | 2324-8866 |
Collection(s) : | Publications Internationales
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