Role of overpressures and in situ stresses in fault-controlled hydrocarbon migration: a case study

Grauls, D.; Baleix, J. M.

doi:10.1016/0264-8172(94)90026-4

Cited by 74 publications

(36 citation statements)

References 5 publications

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“…The material is sucked into the fractures/faults as the opening of the fractures locally leads to underpressuring (Scholz et al, 2009). Simultaneously, the poreefluid pressure facilitates the fault opening (Grauls et Baleix, 1994;Sibson, 1995;Wall and Jenkins, 2004;Bureau et al, 2012). (c) Seismicity induces the liquefaction of a shallow subsurface sand body (<10 m) underlain by consolidated sediments (Obermeier, 1989).…”

Section: Introductionmentioning

confidence: 98%

Sand injectites network as a marker of the palaeo–stress field, the structural framework and the distance to the sand source: Example in the Vocontian Basin, SE France

Monnier

Gay

Imbert

et al. 2015

Journal of Structural Geology

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Sand injectites network as a marker of the palaeoestress field, the structural framework and the distance to the sand source: Example in the Vocontian Basin, SE France a b s t r a c t A large sand injectite network is very well exposed in the area of Bevons, Southeast France. The associated sandstone turbiditic channelefill and the host marls are the AptianeAlbian rocks of the Vocontian Basin. The sand injection network is composed of dykes, sills and sedimentary laccoliths ranging in thickness from mm to pluriem. The dykes and sills have vertical and horizontal lengths of up to and over 100 m and 1 km, respectively. Outcrop observations show that the architecture and morphology of the sand injectites in the marls is governed by the local stress field during injection, preeexisting faults, the hosterock lithology, compaction, and distance to the potential sand source(s). The main set of dykes is oriented N50e60 perpendicular to the minimum compressive stress s 3 during sand injection. Two other sets of dykes are intruded along preeexisting synesedimentary faults oriented N140e150 (set 2) and N90 (set 3) during the AptoeCenomanian interval. Sills and dykes thin laterally away from their potential sand sources and thin laterally away from them. The vertical thickness variations of the dykes and wings are more complex, as thinning away from the sand sources is often compensated by thickening toward the palaeoesurface. Based on field observations and measurements, we characterized the 3D architecture of the sand injectites and showed that the injectites probably formed due to a forceful injection from an overpressured sand body sealed by lowepermeability lithologies.

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Section: Introductionmentioning

confidence: 98%

Sand injectites network as a marker of the palaeo–stress field, the structural framework and the distance to the sand source: Example in the Vocontian Basin, SE France

Monnier

Gay

Imbert

et al. 2015

Journal of Structural Geology

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“…Several workers proposed that faults that cut and connect hydraulically the permeable formations can cause extreme high anomalies of pressure in relatively shallow depth [8,9,20,21] .…”

Section: Modeling Of Pressuring In Permeable Formationsmentioning

confidence: 99%

Overpressure distribution and pressuring mechanism on the southern margin of the Junggar Basin, Northwestern China

Luo

Lou-jun

2006

CHINESE SCI BULL

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On the basis of the pressure data obtained from the southern margin of the Junggar Basin, Northwestern China, the distribution and evolution of overpressures in high permeable sandy and in low-permeability shale formations are characterized. The evolution of overpressures in various structural processes, especially in erosion and mechanical deformation, is quantified by numerical modeling studies. The modeling results show that anomalies of high pressure observed in boreholes are likely a combination of several effects, i.e. 1) the compaction caused by overloading, 2) the compaction caused by lateral tectonic stressing, 3) lateral transmission of hydraulic pressure associated with fold formation, and 4) vertical hydraulic connection caused by opening faults crossing formations with different initial excessive pressures. The main mechanisms of overpressures and their distributions are defined.

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“…The contribution of present day lateral stresses or compressive tectonics, as a possible overpressure mechanism, is rarely considered and remains strongly underestimated, despite the considerations made by Hubbert and Rubey (1959) in thrust-fault contexts, as well by Finch (1969), Berry (1973) and Grauls and Baleix (1993) in strike-slip fault contexts, where S v becomes the intermediate stress (S 2 ).…”

Section: Mechanical Stressmentioning

confidence: 99%

“…Dynamic transfers can be related also to vertical hydraulic flow. Hydrofracturing, and open fault zones act as preferential pathways for hydrocarbon migration (Grauls and Cassignol, 1992;Grauls and Baleix, 1993). Such mechanisms can only account for the large volumes of hydrocarbons transferred to shallow depths from deeper sources, in a very short period of geological time.…”

Section: Dynamic Transfersmentioning

confidence: 99%

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Overpressures: Causal Mechanisms, Conventional and Hydromechanical Approaches

Grauls¹

1999

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Surpressions : origine, approches conventionnelle et hydromécanique -On rencontre souvent des régimes anormaux de pression dans les bassins sédimentaires. Les relations entre la contrainte verticale effective et la porosité ont été appliquées, depuis 1970, dans la région de la Gulf Coast, afin d'évaluer ces surpressions. Des résultats ont été obtenus en faisant appel à la sismique et à la modélisation de bassin dans les bassins tertiaires de sable argileux à contrainte verticale dominante et en déséquilibre de compaction. Cependant, les surpressions d'origines différentes et/ou additionnelles (contrainte tectonique, génération d'hydrocarbures, contrainte thermique, transfert lié aux failles, fracturation hydraulique) ne peuvent pas être quantifiées en utilisant cette approche. En plus des méthodes conventionnelles, une approche hydromécanique est proposée. Pour toute profondeur, la limite supérieure est contrôlée par les conditions de fracturation hydraulique ou par la réactiva-tion de failles. La fracturation hydraulique suppose un système ouvert par période, en régime de contrainte effective mineure proche de zéro. Une connaissance approfondie des régimes de contraintes tectoniques actuels permet une estimation directe de l'évolution de la contrainte minimale. Une évaluation quantitative de la pression avec la profondeur est donc possible, puisque dans les systèmes géologiques compartimentés et/ou non drainés, les régimes de pression, quelles que soient leurs origines, ont tendance à atteindre rapidement une valeur proche de la contrainte principale mineure. Ainsi, l'évaluation de la surpression sera améliorée, puisque cette méthodologie peut être appliquée à divers environnements géolo-giques où les surpressions ont d'autres origines, les mécanismes étant souvent combinés. Cependant, les tendances de l'évolution de pression dans les zones de transition sont plus difficiles à éva-luer de façon correcte. Une recherche complémentaire sur les couvertures et les fermetures sur faille est donc nécessaire pour améliorer leur prévision. En plus de l'évaluation de la surpression, le concept de contrainte principale mineure permet de mieux appréhender le système pétrolier. En effet, les transferts d'hydrocarbures liés aux failles, les domaines de fracturation hydraulique et l'étanchéité du recouvrement dépendent d'une interaction subtile, dans le temps, entre la surpression et les régimes de contrainte principale mineure.Mots-clés : surpressions, contrainte mineure, fracturation hydraulique, transfert par faille, propriétés mécaniques. Abstract

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Role of overpressures and in situ stresses in fault-controlled hydrocarbon migration: a case study

Cited by 74 publications

References 5 publications

Sand injectites network as a marker of the palaeo–stress field, the structural framework and the distance to the sand source: Example in the Vocontian Basin, SE France

Sand injectites network as a marker of the palaeo–stress field, the structural framework and the distance to the sand source: Example in the Vocontian Basin, SE France

Overpressure distribution and pressuring mechanism on the southern margin of the Junggar Basin, Northwestern China

Overpressures: Causal Mechanisms, Conventional and Hydromechanical Approaches

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