Heave of a surficial rock layer due to pressures generated by injected fluids

Selvadurai, A. P. S.

doi:10.1029/2009gl038187

Cited by 35 publications

(30 citation statements)

References 19 publications

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“…Other advanced semianalytical approaches can consider more complex geometries and additional mechanical mechanisms, such as multi-layered reservoirs and the effect of the bending moment between layers. [13][14][15] Nevertheless, these solutions only consider a flat, constant and fixed pressure as a loading variable. The injection-induced effects on the temporal and spatial evolution of the overpressure and of the reservoir deformation are thus omitted.…”

Section: J Nmentioning

confidence: 99%

“…To provide a contribution to the pioneer works of Selvadurai 14,15 and Rutqvist, 11 we propose a novel semianalytical approach to overcome the former limitations. Based on a representative geometry for CO 2 storage, the proposed approach assesses the spatial and temporal surface uplift and caprock deformation caused by CO 2 pressurization and evaluates critical parameters for project design and risk management, including injection rate, permeability of the aquifer, thickness of the caprock, location of the injection zone and mechanical properties of the reservoir.…”

Section: J Nmentioning

confidence: 99%

“…We first derive a mathematical model to calculate the caprock and surface deformation caused by an arbitrary pressurization within the injection zone; this model extends the embedded plate approach proposed by Selvadurai. 14,15 This is followed by the incorporation of injection-induced overpressure distribution functions originating from two analytical solutions proposed by Nordbotten et al 16 and Dentz and Tartakovsky. 17 After mathematical integration, the analytical modelling produces two semi-analytical solutions that can address CO 2 injection-induced effects on the geomechanical behaviour of the reservoir.…”

Section: J Nmentioning

confidence: 99%

“…This radius of influence extends in the radial direction as injection continues and is therefore time-dependent. For caprock deformation, Selvadurai 14,15 proposed an elastic solution in which the caprock is modelled as an embedded plate over a circular region of flat and constant pressurization. Based on his approach, we focus on the extension of the model to account for arbitrary pressurization distributions.…”

Section: Model Descriptionmentioning

confidence: 99%

“…Selvadurai 14,15 considered the caprock layer a thin plate embedded between the overburden region and the storage region. The overburden and storage regions are modelled as half-space regions.…”

Section: Embedded Plate Approachmentioning

confidence: 99%

See 4 more Smart Citations

A hydromechanical approach to assess CO2 injection-induced surface uplift and caprock deflection

Barès

Laloui

2015

Geomechanics for Energy and the Environment

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h i g h l i g h t s• A semi-analytical solution is proposed to assess CO 2 injection in deformable medium.• Good agreement is found between the proposed solution and the finite element method.• Geomechanical interactions between a caprock and adjacent regions are examined.• The surface uplift measured at In Salah can be reproduced by the proposed solution.a r t i c l e i n f o b s t r a c tThis study focuses on the derivation of a semi-analytical approach for the evaluation of surface uplift and caprock deflection induced by underground injection of CO 2 . The adopted methodology includes the development of a mathematical model that incorporates the deformable behaviour of the storage reservoir and the flow of two immiscible fluids (CO 2 and brine) within the aquifer while the surface rock or the caprock layer is modelled as a thin plate. Governing equations are solved for the axisymmetric flexural deflection due to a constant rate of CO 2 injection. Both developed solutions are applied to a representative CO 2 storage case solved numerically by the finite element method, and good agreement between results is observed. When benchmarking to the In Salah surface uplift, the developed semi-analytical approach can capture a high rate of surface uplift caused by the pressure build-up during the early stage of CO 2 injection. The required calculation time is very short compared to a classical finite element approach. This method can be employed as a design tool for the analysis of uncertainty in parameters such as the injection rate, porosity, rock properties and geological structures. This semi-analytical approach also provides an efficient means of estimating the influence of high injection rates of CO 2 on surface uplift.

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Section: J Nmentioning

confidence: 99%

Section: J Nmentioning

confidence: 99%