Reactive transport modelling applied to the prediction of the dolomitization distribution in carbonate hydrocarbon reservoirs

Ronchi, Paola; Consonni, Alberto; Borromeo, O.; Battistelli, Alfredo; Geloni, Claudio

doi:10.3997/1365-2397.2012015

Cited by 6 publications

(4 citation statements)

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“…This is reflected in the localized dolomitization as shown in field evidence. It also points to a focused source of the diagenetic fluids, consistent with the focused outflow of hydrothermal diagenetic fluid origin (Warren 2000;Davies and Smith 2006;Ronchi et al 2012b). In the present study, dolomitization is limited along the fracture and stratabound with a small amount of diagenetic fluids involved and low fluid-rock reactions which has not significantly affected the REE contents and patterns during dolomitization process.…”

Section: Diagenetic Fluidssupporting

confidence: 56%

Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia

Hui

Nagarajan

Ramkumar

et al. 2022

Carbonates Evaporites

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Study of secondary dolomitization and documentation of the evolution of basinal fluids and host rock, especially that of fine-grained deepwater carbonate mudstone are of interest toward of reservoir characterization. From this perspective, field characteristics in relation to mineralogy, petrography and geochemistry of the Paleaozoic carbonates of the Kinta Valley, Peninsular Malaysia, were investigated and documented. A total of 33 samples were collected across the various degree of dolomitization and analyzed for their petrographic properties (n = 55), while mineralogical and geochemical compositions (n = 33) were analyzed using XRD, ICP and ICPMS analysis, respectively. These analyses were performed to elucidate the diagenetic events, episodic dolomitization and development of fluid evolution as a function of regional tectono-thermal events during the Permian to Cenozoic. It is interpreted that the host calcareous mudstones (HCMs) were deposited in oxygenated, open marine seawaters. The studied samples retain the original seawater characteristics despite negligible, minor alterations of REE characteristics due to diagenesis and detrital input. Though the concentrations and trends of REEs of the dolomitic facies are modified to a certain extent, their affinities with HCMs are preserved. Enrichments of Mg, Mn, Na and depletion of Sr are linked to the effect of dolomitization under the open system of diagenesis. The redox conditions fluctuated to show distinct, recognizable variations between different dolomite phases. The MREE enrichments with other trace elements such as Mn, Fe and low Sr content indicate the association of diagenetic fluids with deep-circulating crustal hydrothermal fluids. Hydrothermal influence has been recorded along the fractures, which might have originated from the sub-surface litho units and facilitated episodic dolomitization, especially during significant tectono-thermal events. This study affirms that the occurrence, geochemical and mineralogical evolution of the dolomites of the Kinta Valley were controlled by magmatic events, whereas the intensity of replacement dolomitization was controlled by host rock texture, varied bulk chemistry of host rock, circulating fluid and temperature.

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Section: Diagenetic Fluidssupporting

confidence: 56%

Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia

Hui

Nagarajan

Ramkumar

et al. 2022

Carbonates Evaporites

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“…The fingers of dolomite predicted by this mechanism of self‐organization appear in the platform‐scale reflux RTM models of Jones & Xiao (), Xiao & Jones () and Ronchi et al . (), probably because each of these authors used an initially inhomogeneous but random distribution of permeability, thus establishing the potential for a self‐organizing process to emerge.…”

Section: Discussionmentioning

confidence: 99%

“…Many of these studies have also demonstrated the importance of feedbacks between parameters such as permeability and fluid flow on dolomitization (e.g. Jones & Xiao, ; Xiao & Jones, ; Whitaker & Xiao, ; Al‐Helal et al ., ; Ronchi et al ., ; Gabellone et al ., ). All prior models cited above, however, have been done at scales far larger than that observed for lateral porosity and dolomite patterning.…”

Section: Introductionmentioning

confidence: 98%

“…Prior RTMs of dolomitization have been either platform‐scale or ramp‐scale models (e.g. Wilson et al ., ; Jones & Xiao, ; Consonni et al ., ; Whitaker & Xiao, ; Al‐Helal et al ., ; Ronchi et al ., ; Xiao et al ., ; Corbella et al ., ; Frixa et al ., ; Gabellone et al ., ; Lu & Cantrell, ) or one‐dimensional sensitivity studies (e.g. Salas et al ., ; Gabellone & Whitaker, ).…”

Section: Introductionmentioning

confidence: 99%

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Formation of bed‐scale spatial patterns in dolomite abundance during early dolomitization: Part I. Mechanisms and feedbacks revealed by reaction–transport modelling

Budd

Park²

2017

Sedimentology

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Dolomites of varied ages exhibit metre-scale nested patterns of lateral periodic variation in permeability and porosity and, by inference, dolomite abundance as most examples are 100% dolomite. Two-dimensional reaction-transport modelling simulations of bed-scale dolomitization were used to assess whether those patterns in dolomite abundance could form during near-surface replacement dolomitization. Simulations used a 2 m high and 18 m long model domain, a low-Mg calcite grainstone precursor and an evaporated Mississippian seawater brine (430 parts per thousand salinity) as the dolomitizing fluid. The domain was initially populated with random variations in porosity and/or grain size. Results reveal that spatial patterns in dolomite abundance emerge when there is as little as 1% dolomite formed, with similarities between the modelled patterns and outcrop-documented patterns. The nested patterns include a nearrandom component that constitutes ≤40% of the total variance, short-range correlation ranging from 1Á5 to 3Á3 m and a longer-range periodic trend with a wavelength up to 6Á5 m. The emergence of pattern in dolomite abundance is the result of an autogenic self-organizing phenomenon. It is triggered by variation in initial calcite reactive surface area that occurs due to the random heterogeneities in initial porosity and/or grain sizes. The pattern develops due to a combination of kinetic disequilibrium reactions (dolomite precipitation and calcite dissolution) and positive feedbacks between dolomite growth, calcite dissolution and fluid flow. Flow is around loci of higher dolomite, lower porosity and higher reactive surface areas, but through loci of lower dolomite, higher porosity and lower reactive surface areas. The resulting less porous/more dolomite and more porous/less dolomite structures at the metre-scale arise from those localized interactions. This self-organizing mechanism for pattern formation constitutes a new model for geochemical self-organization during dolomitization and is the only self-organization model that is proven applicable to the formation of metre-scale patterns during early, near-surface dolomitization.

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3D reactive transport modeling of porosity evolution in a carbonate reservoir through dolomitization

et al. 2019

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Reactive transport modelling applied to the prediction of the dolomitization distribution in carbonate hydrocarbon reservoirs

Cited by 6 publications

References 0 publications

Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia

Geochemical evolution of structure-bedding controlled hydrothermal dolomites of the Kinta Valley, Western Malaysia

Formation of bed‐scale spatial patterns in dolomite abundance during early dolomitization: Part I. Mechanisms and feedbacks revealed by reaction–transport modelling

3D reactive transport modeling of porosity evolution in a carbonate reservoir through dolomitization

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