Characterisation and Modelling of Fractured Reservoirs – Static Model

Daly, Colin; Mueller, Dietmar

doi:10.3997/2214-4609-pdb.9.a024

Cited by 7 publications

(1 citation statement)

References 20 publications

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“…In the second approach the fractured reservoir is modelled as a single porous medium characterized by an effective permeability tensor. Daly and Mueller (2004) discussed situations in which we can use the effective permeability model in a single porosity approach and therefore avoid the time consuming dual porosity models. If the fluid transfer from the matrix to fracture is reasonably fast (as in the case of high porosity sandstones but perhaps not for carbonates), we can use the single porosity approach.…”

Section: The Forward Problemmentioning

confidence: 99%

Characterization of fractured reservoirs using a consistent stiffness-permeability model: focus on the effects of fracture aperture

Shahraini

Ali

Jakobsen

2010

Geophysical Prospecting

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The successful exploitation of many hydrocarbon reservoirs may depend on proper characterization of fractured or composite porous media. However, due to anisotropy and heterogeneity, the characterization of such kind of reservoirs is a complicated task which needs proper attention and care. There are often strong correlations between the effective permeability and seismic anisotropy of fractured reservoirs. The exploitation of such correlations is extremely important in understanding of the spatial variation of anisotropic permeability. The purpose of this thesis work was to develop novel workflows and methodologies in order to exploit the correlations between effective permeability and seismic anisotropy of fractured reservoirs.The correlations between the effective mechanical and transport properties of fractured reservoirs within the context of a joint inversion of seismic and production data have been exploited to obtain improved hydrocarbon reservoir characterization.In this work, the effective mechanical and transport properties of fractured reservoirs and related systems are estimated using an efficient and consistent permeabilitystiffness model from the same parameters of microstructure. The estimated effective mechanical properties in combination with anisotropic Gassmann relations have been used to calculate the seismic amplitude versus angle and azimuth AVAZ) data i.e. reflection coefficients as a function of incidence angle and azimuth from the top of the reservoir. Similarly from the estimated effective hydraulic properties, the reservoir simulator can calculate the production data such as well bottom hole pressure, well oil production, well water cut, saturation and pressure for all grid blocks at specific time steps.The seismic AVAZ and/or production data is used in the Bayesian inversion scheme to estimate the parameters of factures (e.g. fracture density, fracture aperture and fracture orientation) required to predict permeability. This work shows that joint inversion of seismic and production data give the best results due to the less sensitivity of seismic AVAZ data to fracture aperture which is one of the most II important parameter of the microstructure predicting the permeability. This workflow of joint inversion of seismic and production data has also been applied for the characterization of faulted reservoirs (e.g., fault damage zone with deformation bands oriented parallel to the fault core). The transmissibility multiplier is used to model the effect of the fault core and the consistent rock physics model has been used to model fractures and deformation bands in the damaged zone.Analogies between different physical phenomena and coupled processes such as wave-induced fluid flow have been given a special attention to infer more useful information about fractured reservoirs containing single or multiple sets of fractures. The results obtained form these workflows and methods can help in better management of fractured reservoirs and optimum field development. IV Preface

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Section: The Forward Problemmentioning

confidence: 99%

Characterization of fractured reservoirs using a consistent stiffness-permeability model: focus on the effects of fracture aperture

Shahraini

Ali

Jakobsen

2010

Geophysical Prospecting

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Improved characterization of fault zones by quantitative integration of seismic and production data

Ali

Shahraini

Jakobsen

2011

Journal of Geophysics and Engineering

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The modelling of fractured reservoirs: constraints and potential for fracture network geometry and hydraulics analysis

Makel

2007

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The interconnectedness of a subsurface fracture system depends on five fracture and fracture set geometry characteristics: density, orientation, dimensions (height and length), connectivity and aperture. Orientation and density can be determined with some degree of accuracy but the uncertainty ranges associated with the other characteristics will be large. Calibration with dynamic indicators will bring out the hydraulic properties of the network and can help to reduce uncertainty in the geometric characteristics. The fracture network geometry in the inter-well space can be described through geostatistical analysis but more commonly it is derived from seismic data, through edge detection or the analysis and calibration of seismic velocity anisotropy attributes or curvature analysis. Geomechanical analysis is necessary to evaluate the impact on network conductivity of the changing stress state in the reservoir. Using percolation theory, a qualitative assessment can be made of how the conductivity and interconnectedness of the fracture network is developed in terms of network clusters. This integrated analysis of static and dynamic fracture data leads to the formulation of conceptual models and a set of modelling rules. A Digital (Discrete) Fracture Network model, based on these concept(s), rules and inter-well interpolation data, can then be analysed in terms of expected network cluster size, distribution and hydraulics. This provides a control on the expectations embedded in the concepts prior to dynamic modelling. The uncertainties are normally quite large and very seldom will they allow construction of the definitive fracture model. The systematic and integrated analysis of fracture network geometry, constrained with dynamic indicators and subsequent network cluster analysis, are necessary preparatory steps for construction and analysis of dynamic models.

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Characterisation and Modelling of Fractured Reservoirs – Static Model

Cited by 7 publications

References 20 publications

Characterization of fractured reservoirs using a consistent stiffness-permeability model: focus on the effects of fracture aperture

Characterization of fractured reservoirs using a consistent stiffness-permeability model: focus on the effects of fracture aperture

Improved characterization of fault zones by quantitative integration of seismic and production data

The modelling of fractured reservoirs: constraints and potential for fracture network geometry and hydraulics analysis

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