Methane-bearing aqueous fluid inclusions: Raman analysis, thermodynamic modelling and application to petroleum basins

Dubessy, Jean; Buschaert, Stéphane; Lamb, William M.; Pironon, Jacques; Thiéry, Régis

doi:10.1016/s0009-2541(00)00275-8

Cited by 108 publications

(66 citation statements)

References 13 publications

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“…4 and 5) can be assigned to CAH stretch vibrations in CH 4 , CH 3 , or CH 2 groups (Socrates, 2001). Its frequency is similar to that of CH 4 (methane) as observed, for example, in Raman spectra of CH 4 -containing fluid inclusions (e.g., Seitz et al, 1987;Dubessy et al, 1999Dubessy et al, , 2001 suggesting that this band most likely should be assigned to CAH stretching in CH 4 groups. In light of this interpretation it seems reasonable that at least one of the intense peaks in the 1.3-1.5 ppm range of the 1 H MAS NMR spectra (Fig.…”

Section: Raman Spectroscopysupporting

confidence: 66%

“…However, we note that a broad asymmetric peak is always present in spectra of water-bearing glasses and melts (e.g., Stolen and Walrafen, 1976;McMillan and Remmele, 1986;Yamashita et al, 2007). A strong and sharp Raman band near 2900 cm À1 is characteristic of spectra from methane-bearing fluid inclusions and from methane chlatrates (e.g., Pasteris et al, 1990;Murphy and Roberts, 1995;Dubessy et al, 2001). A peak near 4250 cm À1 is a characteristic feature of hydrogen-bearing melts and chlatrates (e.g., Luth et al, 1987;Murphy and Roberts, 1995).…”

mentioning

confidence: 99%

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Solution behavior of reduced COH volatiles in silicate melts at high pressure and temperature

Mysen

Fogel

Morrill

et al. 2009

Geochimica et Cosmochimica Acta

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The solubility and solution mechanisms of reduced CAOAH volatiles in Na 2 OASiO 2 melts in equilibrium with a (H 2 + CH 4 ) fluid at the hydrogen fugacity defined by the iron-wü stite + H 2 O buffer [f H2 (IW)] have been determined as a function of pressure (1-2.5 GPa) and silicate melt polymerization (NBO/Si: nonbridging oxygen per silicon) at 1400°C. The solubility, calculated as CH 4 , increases from $0.2 wt% to $0.5 wt% in the melt NBO/Si-range $0.4 to $1.0. The solubility is not significantly pressure-dependent, probably because f H2 (IW) in the 1-2.5 GPa range does not vary greatly with pressure. Carbon isotope fractionation between methane-saturated melts and (H 2 + CH 4 ) fluid varied by $14& in the NBO/Si-range of these melts. The (C..H) and (O..H) speciation in the quenched melts was determined with Raman and 1 H MAS NMR spectroscopy. The dominant (C..H)-bearing complexes are molecular methane, CH 4 , and a complex or functional group that includes entities with C"CAH bonding. Minor abundance of complexes that include SiAOACH 3 bonding is tentatively identified in some melts. There is no spectroscopic evidence for SiAC or SiACH 3 . Raman spectra indicate silicate melt depolymerization (increasing NBO/Si). The [CH 4 /C"CAH] melt abundance ratio is positively correlated with NBO/Si, which is interpreted to suggest that the (C"CAH)-containing structural entity is bonded to the silicate melt network structure via its nonbridging oxygen. The $14& carbon isotope fractionation change between fluid and melt is because of the speciation changes of carbon in the melt.

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Section: Raman Spectroscopysupporting

confidence: 66%

mentioning

confidence: 99%

Solution behavior of reduced COH volatiles in silicate melts at high pressure and temperature

Mysen

Fogel

Morrill

et al. 2009

Geochimica et Cosmochimica Acta

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“…In the homogenized P1 inclusions no methane peak could be observed in the Raman spectra; this behaviour suggests that the amount of methane is very small in these inclusions (i.e. below 0.01 m, [32]) (Fig. 5A).…”

Section: Fluid Inclusionsmentioning

confidence: 93%

Fluid inclusion studies in datolite of low grade metamorphic origin from a Jurassic pillow basalt series in northeastern Hungary

2012

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Abstract:The Jurassic pillow basalt blocks in the Szarvaskő Unit in the SW-Bükk Mountains are incorporated into an accretionary mélange of Cretaceous age which had been displaced from the Dinarides to NE-Hungary during the Alpine-Carpathian collision. The pillow basalt series is a part of an incomplete remnant of an ophiolite-like sequence from which ultramafic units and sheeted dikes are almost completely absent. At the studied Egerbakta quarry, closely packed pillow, pillow fragmented hyaloclastite breccia and peperitic facies of submarine basaltic volcanism were recognized. Peperitic facies was formed by local admixture of unconsolidated siliciclastic sediment into the basaltic lava. Basaltic pillows contains short and thin prehnite-chlorite-carbonate-quartz veins formed during the interaction of seawater with the cooling lava, as well as cross-cutting datolite-prehnite-quartzchlorite-albite bearing veins. Calcite in the short cooling cracks crystallised from upheated seawater at around 160 • C temperature and 0.5-0.6 kbar pressure (water depth of about 5-6 km). Datolite precipitations in veins can be classified into at least three different textural-morphological types but all of them contain methane bearing primary fluid inclusion assemblages, with variable methane/water ratios, suggesting an inhomogeneous entrapment from a heterogeneous aqueous-carbonic fluid. End member primary fluid inclusions contain aqueous liquid with methane rich vapour phase and apparently methane only inclusions characterized by liquid phase on room temperature. A combination of results from fluid inclusion microthermometry, Raman spectroscopy (used not only for phase identification but also for determination of salinities) and temperatures calculated from chlorite compositions, show that the precipitation of datolite had taken place from low salinity (0.2-2 NaCl equiv. mass%) aqueous-methane fluids under increasing temperature and pressure (from 160 to 210 • C, and from 0.6 to 1.1 kbar) conditions. The elevated pressures and temperatures in comparison to the submarine hydrothermal processes suggest that the datolite bearing mineral parageneses had been formed during the progression of Alpine very low grade metamorphic processes.

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“…The interest of this procedure is also the possibility to analyse fluids under the experiment conditions. This technique has been largely employed for solubility, PVT, critical and phase equilibrium properties studies (Bodnar and Sterner, 1987;Frantz et al, 1989;Frantz et al, 1992;Lamb et al, 1996;Dubessy et al, 2001;Lamb et al, 2002;Guillaume et al, 2003). An example of synthetic inclusions study in the gas-water-saltoil system is also given by .…”

Section: Synthetic Fluid Inclusionsmentioning

confidence: 99%

A New Experimental Procedure for Simulation of H₂s + CO₂Geological Storage. Application to Well Cement Aging

Jacquemet¹,

Pironon²,

Caroli

2005

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Nouvelle procédure expérimentale destinée à la simulation d'une séquestration géologique de H 2 S + CO 2 . Application au vieillissement des ciments de puits -Nous proposons une nouvelle procédure expérimentale destinée à étudier la réactivité des systèmes H 2 S + CO 2 -saumure-solides dans des conditions de haute pression et haute température (jusqu'à 990 bar et 450 °C). Un montage sous la forme d'une ligne de gaz a été conçu afin d'introduire de façon précise une quantité de gaz dans des microréacteurs. Des systèmes à très forte concentration en gaz peuvent être étudiés dans le respect des règles de sécurité. Nous avons adapté la technique des inclusions fluides synthétiques à cette procédure. Cette technique permet l'échantillonage in situ des fluides pendant les expérimentations. Les bilans de masse des espèces gazeuses permettent de quantifier leur consommation ou leur genèse. Les résultats de deux vieillissements de ciment de puits, d'une part en présence de saumure (expérimen-tation 1), et d'autre part en présence de saumure et de H 2 S + CO 2 (expérimentation 2), sont présentés en tant qu'application de cette procédure expérimentale. Les conditions choisies furent 500 bar, 200 °C pour une durée de 15 jours. Dans un environnement constitué par une saumure (expérimentation 1), le ciment initialement composé d'un assemblage de tobermorite (CSH) est converti en un assemblage de xonotlite (CSH). Cette transformation s'est effectuée dans une gamme de pH de l'ordre de 10.3-11.2. La présence d'H 2 S et CO 2 (expérimentation 2) provoque une chute de pH (de 10.3-11.2 à 8-9) et de Eh (de conditions oxydantes à des conditions réductrices). Ces conditions ont conduit à une carbonatation partielle du ciment et à la transformation des phases porteuses de fer (Fe°de l'acier et C 4 AF du ciment) en pyrite (FeS 2 ). Le ciment a ainsi été transformé en un assemblage de tobermorite décalcifiée et de calcite (CaCO 3 ). En outre, la procédure utilisée nous a permis d'estimer les consommations molaires de H 2 S et CO 2 aux valeurs respectives de 6 et 16%. La consommation de H 2 S est essentiellement due à sa combinaison avec le Fe°de l'acier pour former des sulfures. La valeur de la consommation de CO 2 permet d'estimer que le ciment vieilli est composé de 5 volumes de tobermorite contre 1 volume de calcite. Les observations effectuées au microscope électronique à balayage sont en accord avec cet ordre de grandeur. Abstract

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Methane-bearing aqueous fluid inclusions: Raman analysis, thermodynamic modelling and application to petroleum basins

Cited by 108 publications

References 13 publications

Solution behavior of reduced COH volatiles in silicate melts at high pressure and temperature

Solution behavior of reduced COH volatiles in silicate melts at high pressure and temperature

Fluid inclusion studies in datolite of low grade metamorphic origin from a Jurassic pillow basalt series in northeastern Hungary

A New Experimental Procedure for Simulation of H₂s + CO₂Geological Storage. Application to Well Cement Aging

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Methane-bearing aqueous fluid inclusions: Raman analysis, thermodynamic modelling and application to petroleum basins

Cited by 108 publications

References 13 publications

Solution behavior of reduced COH volatiles in silicate melts at high pressure and temperature

Solution behavior of reduced COH volatiles in silicate melts at high pressure and temperature

Fluid inclusion studies in datolite of low grade metamorphic origin from a Jurassic pillow basalt series in northeastern Hungary

A New Experimental Procedure for Simulation of H2s + CO2Geological Storage. Application to Well Cement Aging

Contact Info

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A New Experimental Procedure for Simulation of H₂s + CO₂Geological Storage. Application to Well Cement Aging