Predictive modelling of structure evolution in sandbox experiments

Crook, A. J. L.; Willson, S.M.; Yu, Jianguo; Owen, D. R. J.

doi:10.1016/j.jsg.2006.02.002

Cited by 102 publications

(59 citation statements)

References 53 publications

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“…It is defined in the p − q plane with two functions that intersect at the point of maximum deviatoric stress. The shear side is defined using the SR3 surface (Crook et al, 2006) whereas the compression side is defined by the elliptical function of the standard Cam clay model (Wood, 1990;Rouainia and Muir Wood, 2000):…”

Section: Yield Surfacementioning

confidence: 99%

Assessing the implications of tectonic compaction on pore pressure using a coupled geomechanical approach

Obradors-Prats

Rouainia

Aplin

et al. 2017

Marine and Petroleum Geology

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractOverpressure prediction in tectonic environments is a challenging topic. The available pore pressure prediction methods are designed to work in environments where compaction is mostly one dimensional and driven by the vertical effective stress applied by the overburden. Furthermore, the impact of tectonic deformation on stresses, porosity and overpressure is still poorly understood. We use a novel methodology to capture the true compaction phenomena occurring in an evolving 3D stress regime by integrating a fully-coupled geomechanical approach with a critical state constitutive model. To this end, numerical models consisting of 2D plane strain clay columns are developed to account for compaction and overpressure generation during sedimentation and tectonic activity. We demonstrate that a high deviatoric stress is generated in compressional tectonic basins, resulting in a substantial decrease in porosity with continuing overpressure increase.The overpressure predictions from our numerical models are then compared to those estimated by the equivalent depth method (EDM) in order to quantify the error induced when using classical approaches, based on vertical effective stress, in tectonic environments. The stress paths presented here reveal that a deviation from the uniaxial burial trend can substantially reduce the accuracy of the EDM overpressure predictions.

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Section: Yield Surfacementioning

confidence: 99%

Assessing the implications of tectonic compaction on pore pressure using a coupled geomechanical approach

Obradors-Prats

Rouainia

Aplin

et al. 2017

Marine and Petroleum Geology

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“…3). The shear side is defined using the SR3 surface (Crook et al, 2006) while the compression side is defined by an ellipse in a similar manner as the standard Cam clay model (Wood, 1990):…”

Section: Constitutive Equationsmentioning

confidence: 99%

Stress and pore pressure histories in complex tectonic settings predicted with coupled geomechanical-fluid flow models

Obradors-Prats

Rouainia

Aplin

et al. 2016

Marine and Petroleum Geology

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. (2016) 'Stress and pore pressure histories in complex tectonic settings predicted with coupled geomechanical-uid ow models.', Marine and petroleum geology., 76 . pp. 464-477. Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractMost of the methods currently used for pore pressure prediction in sedimentary basins assume one-dimensional compaction based on relationships between vertical effective stress and porosity. These methods may be inaccurate in complex tectonic regimes where stress tensors are variable. Modelling approaches for compaction adopted within the geotechnical field account for both the full three-dimensional stress tensor and the stress history. In this paper a coupled geomechanical-fluid flow model is used, along with an advanced version of the Cam-Clay constitutive model, to investigate stress, pore pressure and porosity in a Gulf of Mexico style mini-basin bounded by salt subjected to lateral deformation. The modelled structure consists of two depocentres separated by a salt diapir. 20% of horizontal shortening synchronous to basin sedimentation is im-posed. An additional model accounting solely for the overpressure generated due to 1D disequilibrium compaction is also defined. The predicted deformation regime in the two depocentres of the mini-basin is one of tectonic lateral compression, in which the horizontal effective stress is higher than the vertical effective stress. In contrast, sediments above the central salt diapir show lateral extension and tectonic vertical compaction due to the rise of the diapir. Compared to the 1D model, the horizontal shortening in the mini-basin increases the predicted present-day overpressure by 50%, from 20 MPa to 30 MPa. The porosities predicted by the mini-basin models are used to perform 1D, porosity-based pore pressure predictions. The 1D method underestimated overpressure by up to 6 MPa at 3400 m depth (26% of the total overpressure) in the well located at the basin depocentre and up to 3 MPa at 1900 m depth (34% of the total overpressure) in the well located above the salt diapir. The results show how 2D/3D methods are required to accurately predict overpressure in regions in which tectonic stresses are important.

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“…The geomechanical part is based on the so-called SR3 constitutive model to simulate the complex behaviour of compacting sandstone and shale, including elastic anisotropy, rate dependency, and creep [170]. According to this model, point failure is modelled together with the stress drop and the earthquake failure mechanisms are obtained from analysis of pre-and post-failure effective stress tensors [171,172], similarly to Hazzard and Young [162].…”

Section: Alternative Models Of Rockmentioning

confidence: 99%

Induced seismicity in geothermal reservoirs: A review of forecasting approaches

Gaucher

Schoenball

Heidbach

et al. 2015

Renewable and Sustainable Energy Reviews

159

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In order to reach Europe's 2020 and 2050 targets in terms of greenhouse gas emissions, geothermal resources will have to contribute substantially to meeting carbon-free energy needs. However, public opinion may prevent future large-scale application of deep geothermal power plants, because induced seismicity is often perceived as an unsolicited and uncontrollable side effect of geothermal development. In the last decade, significant advances were made in the development of models to forecast induced seismicity, which are either based on catalogues of induced seismicity, on the underlying physical processes, or on a hybrid philosophy. In this paper, we provide a comprehensive overview of the existing approaches applied to geothermal contexts. This overview will outline the advantages and drawbacks of the different approaches, identify the gaps in our understanding, and describe the needs for geothermal observations. Most of the forecasting approaches focus on the stimulation phase of enhanced geothermal systems which are most prone to generate seismic events. Besides the statistical models suited for realtime applications during reservoir stimulation, the physics-based models have the advantage of considering subsurface characteristics and estimating the impact of fluid circulation on the reservoir. Hence, to mitigate induced seismicity during major hydraulic stimulations, application of hybrid methods in a decision support system seems the best available solution. So far, however, little attention has been paid to geochemical effects on the failure process and to production periods. Quantitative modelling of induced seismicity still is a challenging and complex matter. Appropriate resources remain to be invested for the scientific community to continue its research and development efforts to successfully forecast induced seismicity in geothermal fields. This is a prerequisite for making this renewable energy resource sustainable and accessible worldwide.

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Predictive modelling of structure evolution in sandbox experiments

Cited by 102 publications

References 53 publications

Assessing the implications of tectonic compaction on pore pressure using a coupled geomechanical approach

Assessing the implications of tectonic compaction on pore pressure using a coupled geomechanical approach

Stress and pore pressure histories in complex tectonic settings predicted with coupled geomechanical-fluid flow models

Induced seismicity in geothermal reservoirs: A review of forecasting approaches

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