Rock physics analysis for time‐lapse seismic at Schiehallion Field, North Sea

Meadows, Mark A.; Adams, Donald C.; Ali, Ali; Cole, Steve; Lumley, David; Wright, Rich

doi:10.1190/1.1817017

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…The relationship between seismic velocity and saturation is also complex in carbonates (Rasolofosaon and Zinszner ; Meadows et al . ; Adams, Batzle, and Brevik ; Grochau and Gurevich ). However, the poro‐elasticity theory (Gassmann ; Biot ) appears to provide a robust framework for quantitative interpretations, especially in the case of the surface‐seismic frequency band (Mavko and Mukerji ).…”

Section: Influence Of Water Saturationmentioning

confidence: 99%

Application of combined time‐lapse seismic refraction and electrical resistivity tomography to the analysis of infiltration and dissolution processes in the epikarst of the Causse du Larzac (France)

Valois

Galibert

Guérin

et al. 2015

Near Surface Geophysics

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In geophysical and hydrological studies, it can be challenging to achieve a complete understanding of infiltration processes in the upper zone of a karstic aquifer since this type of medium is highly heterogeneous and may contain a perched aquifer. In an effort to further investigate such aquifers, time‐lapse electrical resistivity tomography and time‐lapse seismic refraction tomography were carried out at three different epochs and at two sites on a dolostone plateau of Southern France. The first site has a sinkhole, whereas the second covers a less efficiently drained area, which is characterized by temporary lakes during periods of heavy rain. These studies show that shallow time‐lapse electrical resistivity tomography and time‐lapse seismic refraction tomography analyses are correlated with hydrological data because resistivities and propagation velocities decrease with increasing rainfall. Nevertheless, the Biot–Gassmann relationship does not provide an adequate explanation for the strong variations in velocity observed in the upper parts of the models. This could be explained by the dissolution process called ghost‐rock weathering, which directly attacks the dolostone rock frame of the studied area. The assessment of such processes can lead to an improved understanding of velocity variations and to the localization of dissolution processes that may affect karstic landscapes or even lead to their collapse.

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Section: Influence Of Water Saturationmentioning

confidence: 99%

Application of combined time‐lapse seismic refraction and electrical resistivity tomography to the analysis of infiltration and dissolution processes in the epikarst of the Causse du Larzac (France)

Valois

Galibert

Guérin

et al. 2015

Near Surface Geophysics

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show abstract

“…In such a scheme, the rock‐fluid interaction is treated as a purely mechanical problem: that is, the change in seismic velocity depends only on the compressibility and density of the fluid ( ρ fl ; K fl ), the physical parameters controlling them [ Batzle and Wang , ], and the density and elastic moduli of the rock frame ( ρ dry ; K dry ; G dry ). It is a common practice in the literature to include the time‐variant effects on the properties of the fluid and the rock frame due to the variation of physical parameters, such as stress and temperature, which respectively induce compaction and fluid‐phase changes [ Nur et al , ; Lumley , ; Guilbot and Smith , ; Hatchell and Bourne , ; Meadows et al , ]. A basic assumption of Gassmann's theory is that the fluid and the rock matrix do not interact, implying that when this occurs in situ, the elastic moduli of the rock frame and its porosity are treated as time‐invariant parameters in a 4‐D scheme.…”

Section: Introductionmentioning

confidence: 99%

Chemomechanical evolution of pore space in carbonate microstructures upon dissolution: Linking pore geometry to bulk elasticity

Arson

Vanorio

2015

JGR Solid Earth

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One of the challenges faced today in a variety of geophysical applications is the need to understand the changes of elastic properties due to time‐variant chemomechanical processes. The objective of this work is to model carbonate rock elastic properties as functions of pore geometry changes that occur when the solid matrix is dissolved by carbon dioxide. We compared two carbonate microstructures: porous micrite (“mudstone”) and grain‐supported carbonate (“packstone”). We formulated a mathematical model that distinguishes the effects of microporosity and macroporosity on stiffness changes. We used measures of mechanical and chemical porosity changes recorded during injection tests to compute elastic moduli and compare them to moduli obtained from wave velocity measurements. In mudstones, both experimental and numerical results indicate that bulk moduli change by less than 5%. The evolution of elastic moduli is controlled by macropore enlargement. In packstones, model predictions underestimate changes of elastic moduli with total porosity by 10% to 80%. The total porosity variation is 60% to 75% smaller than the chemical porosity variation, which indicates that pore expansion due to dissolution is counterbalanced by pore shrinkage due to compaction. Packstone elastic properties are controlled by grain sliding. The methodology presented in this paper can be generalized to other chemomechanical processes studied in rocks, such as dislocations, glide, diffusive mass transfer, recrystallization, and precipitation.

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“…provides the link between the 4D seismic anomalies and the underlying changes in pressure and saturation that give rise to them (Meadows et al, 2005). In principle, such inversion methods can accommodate a wide variety of production scenarios and fluid types, including oil, water, and gas systems and temperaturedependent effects.…”

Section: Introductionmentioning

confidence: 99%

4D seismic modeling and CO2 pressure-saturation inversion at the Weyburn Field, Saskatchewan

Meadows

Cole

2013

International Journal of Greenhouse Gas Control

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Rock physics analysis for time‐lapse seismic at Schiehallion Field, North Sea

Cited by 4 publications

References 1 publication

Application of combined time‐lapse seismic refraction and electrical resistivity tomography to the analysis of infiltration and dissolution processes in the epikarst of the Causse du Larzac (France)

Application of combined time‐lapse seismic refraction and electrical resistivity tomography to the analysis of infiltration and dissolution processes in the epikarst of the Causse du Larzac (France)

Chemomechanical evolution of pore space in carbonate microstructures upon dissolution: Linking pore geometry to bulk elasticity

4D seismic modeling and CO2 pressure-saturation inversion at the Weyburn Field, Saskatchewan

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