Structurally controlled hydrothermal dolomites in Albian carbonates of the Asón valley, Basque Cantabrian Basin, Northern Spain

López‐Horgue, Mikel A.; Iriarte, Eneko; Schröder, Stefan; Fernández‐Mendiola, P.A.; Caline, Bruno; Corneyllie, H.; Frémont, J.; Sudrie, Mikel Lopez-Horgue and Marina; Zerti, S.

doi:10.1016/j.marpetgeo.2009.10.015

Cited by 94 publications

(102 citation statements)

References 48 publications

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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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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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“…However, dolomite bodies formed by other dolomitization mechanisms, such as structurally-controlled dolomite bodies (e.g. Davies and Smith, 2006;Lonnee and Machel, 2006;López-Horgue et al, 2010;Shah et al, 2010;Sharp et al, 2010), are not expected to have a close tie with the depositional environment, especially when the host rock is significantly compacted at the time of dolomitization. As a consequence, their dimension and spatial distribution cannot be predicted in subsurface based on stratigraphic principles alone.…”

Section: Introductionmentioning

confidence: 99%

Linking process, dimension, texture, and geochemistry in dolomite geobodies: A case study from Wadi Mistal (northern Oman)

Vandeginste¹,

John²,

Flierdt³

et al. 2013

Bulletin

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Understanding the distribution and geometry of reservoir geobodies is crucial for netto-gross estimates and to model subsurface flow. This paper focuses on the process of dolomitization and resulting geometry of diagenetic geobodies in an outcrop of Jurassic host rocks from northern Oman. Field and petrographic data show that a first phase of stratabound dolomite is crosscut by a second phase of fault-related dolomite. The stratabound dolomite geobodies are laterally continuous for at least several hundreds of meters (~1000 ft) and probably regionally and are half a meter (1.6 ft) thick. Based on petrography and geochemistry, a process of seepage reflux of mesosaline or hypersaline fluids during the early stages of burial diagenesis is proposed for the formation of the stratabound dolomite. In contrast, the fault-related dolomite geobodies are trending along a fault that can be followed for at least 100 Running head:Linking process, dimension, texture and geochemistry in dolomite geobodies

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“…Its deposits were affected by sabkha dolomitization and reflux-seepage dolomitization during syngenetic, para-syngenetic, and eogenetic periods and further transformed due to dissolution and cementation during burial diagenesis. In Late Carboniferous, the entire study area was uplifted and eroded by meteoric leaching (Huang et al 2009;López-Horgue et al 2010;Wang et al 2012a, b). Due to the effect of multiple factors, the reservoirs have various pores, including primary (including syngenetic and para-syngenetic) pores, interframework pores and visceral foramen, and secondary pores, such as intergranular dissolved pores, intragranular dissolved pores, intercrystalline dissolved pores, crystal moldic pores, etc.…”

Section: Poresmentioning

confidence: 99%

Combination and distribution of reservoir space in complex carbonate rocks

et al. 2016

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This paper discusses the reservoir space in carbonate rocks in terms of types, combination features, distribution regularity, and controlling factors, based on core observations and tests of the North Truva Oilfield, Caspian Basin. According to the reservoir space combinations, carbonate reservoirs can be divided into four types, i.e., pore, fracture-pore, pore-cavity-fracture, and pore-cavity. Formation and distribution of these reservoirs is strongly controlled by deposition, diagenesis, and tectonism. In evaporated platform and restricted platform facies, the reservoirs are predominately affected by meteoric fresh water leaching in the supergene-para-syngenetic period and by uplifting and erosion in the late stage, making both platform facies contain all the above-mentioned four types of reservoirs, with various pores, such as dissolved cavities and dissolved fractures, or structural fractures occasionally in favorable structural locations. In open platform facies, the reservoirs deposited continuously in deeper water, in an environment of alternative high-energy shoals (where pore-fracture-type reservoirs are dominant) and low-energy shoals (where pore reservoirs are dominant).

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Structurally controlled hydrothermal dolomites in Albian carbonates of the Asón valley, Basque Cantabrian Basin, Northern Spain

Cited by 94 publications

References 48 publications

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

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

Linking process, dimension, texture, and geochemistry in dolomite geobodies: A case study from Wadi Mistal (northern Oman)

Combination and distribution of reservoir space in complex carbonate rocks

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