Reservoir quality, textural evolution, and origin of fault-associated dolomites

Wilson, Martha; Evans, Martin; Oxtoby, N. H.; Nas, D.S; Donnelly, Terry; Thirlwall, M. F.

doi:10.1306/05070706052

Cited by 57 publications

(61 citation statements)

References 55 publications

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“…Faults, fractures and permeable strata are commonly claimed to be preferential pathways for fluid flow during the burial dolomitization of carbonate platforms (Davies & Smith 2006;Wilson et al 2007;Sharp et al 2010). Field observations at the La Ferradura outcrop show a clear spatial association of the dolostones and the N-S striking fault system (Figs 4-5).…”

Section: Seismic To Subseismic Scale Controls On Dolomitizationmentioning

confidence: 97%

Activation of stylolites as conduits for overpressured fluid flow in dolomitized platform carbonates

Martín‐Martín

Gomez‐Rivas

Gómez‐Gras

et al. 2017

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Section: Seismic To Subseismic Scale Controls On Dolomitizationmentioning

confidence: 97%

Activation of stylolites as conduits for overpressured fluid flow in dolomitized platform carbonates

Martín‐Martín

Gomez‐Rivas

Gómez‐Gras

et al. 2017

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“…HTD bodies can have a patchy and localised distribution around sub-seismic scale faults (Machel, 2004;Wilson et al, 2007;Lopez-Horgue et al, 2010), but can also occur as stratabound bodies extending laterally for several tens of kilometres away from the faults proposed to have sourced the hydrothermal fluids (Davies and Smith, 2006;Corbella et al, 2014;Dewit et al, 2014). Important uncertainties remain as to the controls on the nature of hydrothermal alteration and the extent to which this process can form laterally extensive dolomites.…”

Section: Introductionmentioning

confidence: 99%

Reactive transport modelling of hydrothermal dolomitisation using the CSMP++GEM coupled code: Effects of temperature and geological heterogeneity

et al. 2017

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University of Bristol -Explore Bristol Research General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms Reactive transport modelling of hydrothermal dolomitisation using the CSMP++GEM coupled code:Effects of temperature and geological heterogeneity AbstractReactive transport simulations using our CSMP++GEM coupled code were applied to study the major controls on replacement dolomitisation and the development of dolomite geobodies in a hydrothermal setting. A series of 2D simulations show how elevated temperature and reactive surface area increase the rate of dolomitisation, and result in a dolomite replacement front that is both sharper and inclined at a higher angle from vertical. This inclination, an effect of gravity segregation, is apparent in thick homogeneous units, but in layered systems the lithological contrast determines the shape of the dolomite front. The increase in permeability resulting from porosity generation upon replacement of calcite by dolomite has a major effect on accelerating the overall progress of dolomitisation. In contrast, the changes in fluid density due to chemical reactions and the pressure dependence of thermodynamic data have a minor influence under simulated conditions. Primary dolomite forms slowly after complete replacement of host calcite, leading to porosity decrease, and is only locally important around the source of the hydrothermal fluid.For a simple layered system, our model results are in excellent agreement * Corresponding author. Present address: ETH Zurich, Institute of Geochemistry and Petrology. E-mail address: alina.yapparova@gmail.comPreprint submitted to Chemical Geology July 6, 2017with those obtained using TOUGHREACT code. They do, however, show the advantage of unstructured triangular over structured rectangular meshes for resolving complex curved/inclined front shapes. Such meshes also offer benefits in simulating fault-controlled hydrothermal dolomitisation. Our simulations predict dolomite geobodies comparable in scale and morphology to natural examples documented at outcrops, and underline the importance of understanding the permeability structure within and around the fault zone.

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“…This process usually occurs at intermediate burial depths (e.g. Davies and Smith Jr 2006;Smith Jr. and Davies 2006;Wilson et al 2007;Conlife et al 2010;Lavoie and Chi 2010;Ronchi et al 2012;Haeri-Ardakani et al 2013). Fault-related hydrothermal dolomitization in compressional setting was described from several locations (e.g.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal dolomitization of basinal deposits controlled by a synsedimentary fault system in Triassic extensional setting, Hungary

Hips

Haas

Győri

2015

Int J Earth Sci (Geol Rundsch)

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Reservoir quality, textural evolution, and origin of fault-associated dolomites

Cited by 57 publications

References 55 publications

Activation of stylolites as conduits for overpressured fluid flow in dolomitized platform carbonates

Activation of stylolites as conduits for overpressured fluid flow in dolomitized platform carbonates

Reactive transport modelling of hydrothermal dolomitisation using the CSMP++GEM coupled code: Effects of temperature and geological heterogeneity

Hydrothermal dolomitization of basinal deposits controlled by a synsedimentary fault system in Triassic extensional setting, Hungary

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