Integrating 4D Seismic, Geomechanics and Reservoir Simulations in the Elgin and Franklin Fields

Gennaro, S. De; Grandi, A.; Escobar, I.; Onaisi, A.; Ben-Brahim, L.; Joffroy, G.; Tindle, C.; Neillo, V.

doi:10.3997/2214-4609.20147666

Cited by 3 publications

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Review Paper: A semi‐empirical model of strain sensitivity for 4D seismic interpretation

MacBeth

Kudarova

Hatchell

2018

Geophysical Prospecting

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We reformulate the original model of Hatchell and Bourne and Røste, Stovas and Landrø that couples fractional velocity change to subsurface strain via a fundamental constant R. The new model combines elastic compressibility of a dual‐porosity system for a sand–shale mixture with horizontal planes of inter‐granular weakness. The majority of observed R‐factor magnitudes from post‐stack 4D seismic data in both the reservoir and overburden can thus be explained. R is predicted to depend strongly on lithology and also initial strain state. The model is also extended to predict the observed angle‐dependence of time‐lapse time‐shifts from pre‐stack data. An expression for the gradient of time‐shift with incidence angle is obtained in terms of the background VP/VS, and also the ratio of tangential to normal compliances BT/BN representing loss or creation of inter‐granular coupling. If accurately estimated from data, this compliance ratio can be used as an additional parameter to assess the post‐production state of the overburden. It is concluded that whilst R remains the over‐arching parameter controlling the magnitude of time‐shifts measured from 4D seismic data, BT/BN is a subtler parameter that may also prove of future value.

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Review Paper: A semi‐empirical model of strain sensitivity for 4D seismic interpretation

MacBeth

Kudarova

Hatchell

2018

Geophysical Prospecting

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Review Paper: Post‐stack 4D seismic time‐shifts: Interpretation and evaluation

MacBeth

Mangriotis

Amini

2018

Geophysical Prospecting

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A review and analysis of post‐stack time‐lapse time‐shifts has been carried out that covers published literature supplemented by in‐house datasets available to the authors. Time‐shift data are classified into those originating from geomechanical effects and those due to fluid saturation changes. From these data, conclusions are drawn regarding the effectiveness of post‐stack time‐shifts for overburden and reservoir monitoring purposes. A variety of field examples are shown that display the range and magnitude of variation for each class of application. The underlying physical mechanisms creating these time‐shifts are then described, and linked to a series of generic and field‐specific rock physics calculations that predict their magnitudes. These calculations serve as a guide for practitioners wishing to utilize this information on their own datasets. Conclusions are drawn regarding the reliability of this attribute for monitoring purposes, and the extent to which further development is required and how it should be reported by authors.

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A workflow for rapid modelling of production-related geomechanical changes and 4D time-shifts

Toomey¹,

Robinson²,

Kristiansen³

2015

SEG Technical Program Expanded Abstracts 2015

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Integrating 4D Seismic, Geomechanics and Reservoir Simulations in the Elgin and Franklin Fields

Cited by 3 publications

References 0 publications

Review Paper: A semi‐empirical model of strain sensitivity for 4D seismic interpretation

Review Paper: A semi‐empirical model of strain sensitivity for 4D seismic interpretation

Review Paper: Post‐stack 4D seismic time‐shifts: Interpretation and evaluation

A workflow for rapid modelling of production-related geomechanical changes and 4D time-shifts

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