Porosity and permeability variability across a chalk reservoir in the Danish North Sea: Quantitative impacts of depositional and diagenetic processes

Amour, Frédéric; Nick, Hamidreza M.

doi:10.1016/j.enggeo.2021.106059

Cited by 22 publications

(5 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For each of these sets, four permeability fields are generated with different correlation lengths in the x-direction equal to 1, 5, 50 and 200 m. In total, 3 × 4 = 12 permeability fields are made. The porosity is calculated using eq Due to the presence of heterogeneity, the local fluctuation of the velocity occurs in the reservoir.…”

Section: Methodsmentioning

confidence: 99%

The Impact of Spatially Correlated Heterogeneity and Adsorption on Modified Salinity Water in Carbonates

2020

Self Cite

View full text Add to dashboard Cite

Modified salinity water (MSW) core flooding tests conducted in carbonates often exhibit a delay in the additional oil recovery. It has been suggested that the ionic adsorption process controls this delay. In this study, we examine the adverse effect of the adsorption process on the performance of MSW flooding in various models categorized as layered and heterogeneous reservoirs and a North Sea field sector model. To evaluate the impact of porous media's heterogeneity on the delay caused by the adsorption, we introduce the net present volumetric value based on which the cost of delay is calculated. This evaluation is achieved by comparing the calculated cost of delay for heterogeneous systems and that of their equivalent homogeneous porous media. It is found that, as the level of reservoir heterogeneity increases, the adverse effect of ionic adsorption on the improved oil production decreases. Further, computational results suggest that the connectivity index, which is defined as the effective permeability between injection and production wells divided by the average permeability, is a better alternative to the vorticity index to describe the impact of the delay of additional oil recovery in heterogeneous reservoirs subjected to MSW flooding.

show abstract

Section: Methodsmentioning

confidence: 99%

The Impact of Spatially Correlated Heterogeneity and Adsorption on Modified Salinity Water in Carbonates

2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…The computational domain is extracted from an SEM image of chalk (Figure 4a) 43 to resemble the size and shape distributions of natural chalk grains. The resulting geometry contains a heterogeneous network of pore size and shape, including dead-end pores, narrow pore throats, and large pores with high connectivity.…”

Section: Wettability Alterationmentioning

confidence: 99%

Pore-Scale Modeling of Heterogeneous Carbonate Rock Subjected to Modified Salinity Waterflooding

Farhadzadeh,

Bonto,

Nick

2024

Energy Fuels

Self Cite

View full text Add to dashboard Cite

We developed a pore-scale reactive multicomponent twophase flow and transport numerical model to study the pore-level dynamics of water injection in carbonate rocks. The model utilizes direct numerical simulation of Navier−Stokes equations and a newly tuned surface complexation model (SCM) for brine−calcite interactions. An SEM image of chalk mimicking the heterogeneous pore network of the rock is initially saturated with oil and brine and then flooded with brine. With the SCM, we calculate the ζ-potential at the calcite surface under different chemical conditions. The change in the ζ-potential triggered by the shift in the chemical conditions is then related to the variation in the contact angle. We then used the developed coupled model to explore the impact of varying brine compositions, injection sequences, matrix connectivity, and injection rates on the pore-filling sequence and sweep efficiency. Our results demonstrate how the changes in the contact angle, injection rate, and pore connectivity control the displacement process and the ultimate recovery. Injection of modified salinity water results in a later breakthrough time than formation waterflooding. Further, our results confirm that the tertiary mode injection of modified salinity brine is less effective than the secondary mode of modified salinity brine flooding.

show abstract

“…Chalk is a microporous rock built of very small particles (µm radius) from phytoplankton microorganisms. The rock has low permeability (below 10 mD) [32]. In [33], it was found that "newly deposited chalk has interparticle porosity between the sediment grains, and intraparticle porosity within shells of microfossils", but the final value depends on depth, continuous burial, load of the increasing overburden, type of pore water and sediment relationships, presence of stylolites, and pressure dissolution.…”

Section: Porositymentioning

confidence: 99%

Estimation of Petrophysical Parameters of Carbonates Based on Well Logs and Laboratory Measurements, a Review

Stadtmüller

Jarzyna

2023

Energies

View full text Add to dashboard Cite

The purpose of this review paper is to show the possibilities of carbonate reservoir characterization using well logging and laboratory measurements. Attention was focused on standard and new methods of well logging acquisition and interpretation including laboratory experiments to show a part of the history of carbonate rock investigations as hydrocarbon or water reservoirs. Brief information on the geology, mineralogy and petrography of carbonate rocks was delivered. Reservoir properties, i.e., porosity (including fracturing), permeability, and saturation, were defined to emphasize the specific features of carbonates, such as fractures, and vugs. Examples of methodologies were selected from the commonly used laboratory techniques (thin sections examination, mercury and helium porosimetry, X-ray diffraction—XRD) combined with the standard well logs (bulk density—RHOB, neutron porosity—NPHI, sonic slowness—DT, and deep resistivity—Rd) to show the methods that have been used since the very beginning of the scientific and engineering studies of carbonates. Novelty in well logging, i.e., resistivity and acoustic imaging, nuclear magnetic resonance–NMR, dipole shear sonic imaging–DSI, and a spectral neutron-gamma log-geochemical device–GLT combined with modern laboratory investigations (NMR laboratory experiments, scanning electron microscopy SEM), showed how continuous information on mineral composition, porosity and saturation could be obtained and juxtaposed with very detailed laboratory data. Computed X-ray tomography (CT) enabling the 2D and 3D analyses of pores and fractures was presented as a quantitative methodology, effective in pore space characterization, revealing rock filtration abilities. Deep learning and artificial intelligence were used for joining various types of data. It was shown that thanks to new computational technologies original data from very small samples (micro scale), extensively describing the flow ability of the reservoir, could be extended to mezzo scale (core samples) and macro scale (well log images). Selected examples from the published papers illustrated the review. References cited in the text, together with the issues included in them, were the rich source of the practical knowledge processed These were checked by the authors and could be used in other projects.

show abstract

Porosity and permeability variability across a chalk reservoir in the Danish North Sea: Quantitative impacts of depositional and diagenetic processes

Cited by 22 publications

References 42 publications

The Impact of Spatially Correlated Heterogeneity and Adsorption on Modified Salinity Water in Carbonates

The Impact of Spatially Correlated Heterogeneity and Adsorption on Modified Salinity Water in Carbonates

Pore-Scale Modeling of Heterogeneous Carbonate Rock Subjected to Modified Salinity Waterflooding

Estimation of Petrophysical Parameters of Carbonates Based on Well Logs and Laboratory Measurements, a Review

Contact Info

Product

Resources

About