Simulating the effect of subseismic fault tails and process zones in a siliciclastic reservoir analogue: Implications for aquifer support and trap definition

Rotevatn, Atle; Fossen, Haakon

doi:10.1016/j.marpetgeo.2011.07.005

Cited by 87 publications

(42 citation statements)

References 70 publications

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“…Future work will also include seismic imaging simulations of a real 3D case scenario (e.g. outcrop) with well-constrained fault related deformation and petrophysical properties (e.g., Rotevatn and Fossen, 2011). rather than a fault, and are therefore more related to larger amplitude values. By correlating the seismic amplitude to the input rock properties, we do not directly retrieve the rock properties from the seismic data, but we get better knowledge of the amplitude distribution related to the extracted geobody and the possible distribution of rock properties within it.…”

Section: Discussionmentioning

confidence: 99%

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From mechanical modeling to seismic imaging of faults: A synthetic workflow to study the impact of faults on seismic

Botter

Cardozo

Hardy

et al. 2014

Marine and Petroleum Geology

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Section: Discussionmentioning

confidence: 99%

“…Going from outcrop to reservoir modelling is also an interesting possibility to better constrain the petrophysical properties of the fault model (Rotevatn and Fossen, 2011;Fachri et al, 2013). Reservoir properties can be defined using field measurements of laboratory testing.…”

Section: Outcrop Modelsmentioning

confidence: 99%

From mechanical modeling to seismic imaging of faults: A synthetic workflow to study the impact of faults on seismic

Botter

Cardozo

Hardy

et al. 2014

Marine and Petroleum Geology

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“…Reservoir-scale flow modelling is unable to investigate the problem scale of interest in the present study and is, therefore, out of our scope but has been the focus of several previous studies (e.g. Matthäi et al 1998;Sternlof et al 2006;Rotevatn & Fossen 2011;Zuluaga et al 2016).…”

Section: Applicability and Limitations Of The Present Studymentioning

confidence: 99%

“…Deformation bands have, therefore, been suspected of causing production problems within siliciclastic subsurface reservoirs (Lewis & Couples 1993;Olsson et al 2004), although this has been difficult to prove given their small-scale nature. In response to this, previous studies have attempted to quantify and simulate the effect of deformation bands on fluid flow dynamics and production performance (Matthäi et al 1998;Sternlof et al 2006;Fossen & Bale 2007;Rotevatn et al 2009Rotevatn et al , 2013Rotevatn & Fossen 2011;Zuluaga et al 2016). In general these studies have demonstrated that deformation bands in siliciclastic reservoirs or aquifers may cause (i) perturbed flow patterns, leading to more tortuous fluid flow (Rotevatn et al 2009;Zuluaga et al 2016), (ii) pressure compartmentalization (Rotevatn & Fossen 2011), (iii) improved sweep efficiency (Rotevatn et al 2009;Zuluaga et al 2016), (iv) delayed water breakthrough (Rotevatn et al 2009), (v) anisotropic reservoir flow properties (Sternlof et al 2006), (vi) variable production efficiency (Sternlof et al 2006;Rotevatn et al 2009) and (vii) reduced effective permeability within the reservoir (Fossen & Bale 2007;Rotevatn et al 2013).…”

mentioning

confidence: 99%

Do deformation bands matter for flow? Insights from permeability measurements and flow simulations in porous carbonate rocks

Rotevatn

Fossmark

Bastesen

et al. 2016

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We investigate the permeability and flow effects of deformation bands in porous granular carbonate rocks in Malta and use results from flow simulations to discuss the practical implications of deformation bands in carbonate and siliciclastic reservoirs rocks in general. Image-and laboratory-based analyses of deformation bands show permeabilities that are 1 -2 orders of magnitude lower than the adjacent host rocks. Small-scale outcrop-based flow models (1 × 1 m) focus on the effect of deformation band on flow at the scale of individual bands. Two-phase flow simulations (water displacing oil) show that at the local scale a decrease in deformation band permeability led to increasing flow complexity, reduced and irregular waterfront propagation and reduction in sweep efficiency. A reduction in host rock permeability is associated with increased sensitivity to deformation bands. In low-permeable host rocks, a single magnitude-order reduction of deformation band permeability significantly delays flow, whereas in higher-permeable host rocks the effect is less pronounced. Hence, in some cases, deformation bands may represent a significant impediment to flow already when they are only 1 -2 orders of magnitude less permeable than host rock. Consequently, deformation bands may have greater practical implications than previously thought, particularly in reservoir rocks with moderate to low host rock permeability.

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“…Fluid flow across and along fault zones has repercussions on numerous practical applications because faults are common in aquifers and reservoirs and their hydraulic behaviors affect flow pathways (Caine et al 1996;Aydin 2000;Bense et al 2008;Rotevatn and Fossen 2011;Antonellini et al 2014). In general, this effect depends on the hydraulic properties of the faults and the associated fracture systems relative to those of the surrounding host rocks.…”

Section: Introductionmentioning

confidence: 99%

Permeability of a fault zone crosscutting a sequence of sandstones and shales and its influence on hydraulic head distribution in the Chatsworth Formation, California, USA

Cilona

Aydin

Johnson³

2014

Hydrogeol J

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Faults influence groundwater flow paths. The transport of groundwater contaminants within the faulted sandstones and shales of Chatsworth Formation exposed in southern California, USA, have been investigated. Structural and hydrogeological data are combined to interpret the hydraulic-head drop measured across a fault with tens of meters of oblique-slip. The fault zone architecture was delineated at two locations: an outcrop and a borehole intersecting the fault at depth. At the first station, the fault juxtaposes sandstones against shales with a fault core mostly consisting of deformed shale. A series of shale beds striking parallel to the fault zone and dipping ∼50°toward the fault zone provides evidence that the shale was incorporated into the fault zone. At the second station, borehole images show a plane juxtaposing fractured sandstone against shale-rich fault rock. Hydraulic heads measured at 30 wells show a drop of 75 m across the fault, which is interpreted to be a result of the low-permeability shaley fault rock. It is proposed that the shale was incorporated into the fault zone by shale smearing. These results are consistent with numerical modeling, which requires a low-permeability fault core to simulate the observed hydraulic head differences. Understanding the hydraulic nature of this fault provides a critical constraint for evaluating the future migration of contaminants in the groundwater system.

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Simulating the effect of subseismic fault tails and process zones in a siliciclastic reservoir analogue: Implications for aquifer support and trap definition

Cited by 87 publications

References 70 publications

From mechanical modeling to seismic imaging of faults: A synthetic workflow to study the impact of faults on seismic

From mechanical modeling to seismic imaging of faults: A synthetic workflow to study the impact of faults on seismic

Do deformation bands matter for flow? Insights from permeability measurements and flow simulations in porous carbonate rocks

Permeability of a fault zone crosscutting a sequence of sandstones and shales and its influence on hydraulic head distribution in the Chatsworth Formation, California, USA

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