The Identity of Petrophysical Properties of Oceanic Serpentinites and Continental Granitoids: Implications for the Recognition of Buried Hydrocarbon-bearing Serpentinite Geobodies

Manuella, Fabio Carmelo; Carbone, Serafina

doi:10.1134/s0016852119020055

Cited by 2 publications

(1 citation statement)

References 107 publications

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“…The range of V Pd and V Sd matched those measured in different locations (Fig. 8;Gibert 2003;Song et al 2004;Schmitt et al 2007;Diamantis et al 2009Diamantis et al , 2011Iosif Stylianou et al 2016;Falcon-Suarez et al 2017;Farough & Karrasch 2019;Manuella & Carbone 2019). Thus, the V Pd and V Pd values measured for the fresh to slightly altered samples displayed similarities with those measured by Diamantis et al (2009; the ranges of V Pd and V Pd are 7000-8000 and 3800-4550 m s -1 , respectively) in samples with lower porosity (<1 per cent) and a low degree of alteration (<30 per cent by volume) from the Central Greece peridotite.…”

Section: Comparison To the Petrophysical Data Reported In Previous St...supporting

confidence: 80%

Petrophysical characterization and thermal conductivity prediction of serpentinized peridotites

Chibati

Géraud

Essa

2022

Geophysical Journal International

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Summary We investigated 22 different serpentinization level peridotite samples from the North Pyrenean Zone (NPZ) and along the North Pyrenean Fault (NPF) to characterize their mineralogical composition and petrophysical properties (bulk and grain density, porosity, compressional and shear wave velocities and thermal conductivity and diffusivity). Peridotites have a percentage of serpentine which varies between 5% and 97% for fresh samples and totally altered ones, respectively. The mineralogical changes by serpentinization induced a wide variety of petrophysical properties. The key indicators of serpentinization from petrophysical properties in serpentinized peridotite include an increase of porosity of up to 10% and the associated decrease in the solid density ranging from 3.29 g cm–1 for fresh peridotites to 2.5 g cm–3 for the totally serpentinized peridotites. Thermo-physical properties were found to follow the same deceasing trend as the serpentinization increases up to 3000 m.s–1 and 1.85 W m–1 K–1 for P-wave velocity and thermal conductivity (TC), respectively. For TC estimation, empirical relationships were produced using multiple linear regression (MLR) and a mineralogy model. For the mineralogy model, we used ten mixing models commonly used in indirect TC estimation based on mineral composition. For the mean TC of individual mineral phases, the TC estimation shows that in case of non-availability of the proper samples for direct measurement, the TC of peridotite can be inferred with an acceptable level of error from the geometric mean model and harmonic mean models for the dry and saturated conditions respectively. Based on the results of MLR, the study also confirms that the TC of dry rocks can be predicted through acoustic velocity, density and porosity with a prediction accuracy of ± 0.24 W m−1 K−1 and confidence of > 80%.

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Section: Comparison To the Petrophysical Data Reported In Previous St...supporting

confidence: 80%

Petrophysical characterization and thermal conductivity prediction of serpentinized peridotites

Chibati

Géraud

Essa

2022

Geophysical Journal International

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Greenstones as a source of hydrogen in cratonic sedimentary basins

Hutchinson,

Jackson,

Stocks

et al. 2024

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A model is presented for the generation of natural hydrogen from cratonic basement rocks and its migration into the sediments of overlying cratonic basins. It is based on the ‘discovery’ of hydrogen at Bourakebougou in the Taoudeni Basin of Mali. In the Cratonic Greenstone Model hydrogen is generated by the serpentinisation of olivine-rich, ultramafic rocks contained within Precambrian ‘greenstones’. The model requires a protolith (in greenstones), a supply of water (from groundwater), connecting faults to act as a plumbing system and an indurated sediment cover to retard hydrogen movement. Hydrogen is expelled into the overlying basin sediments which form the host for hydrogen accumulations. The model describes a continental ‘hydrogen system’ which can form the basis for petroleum-type play-based hydrogen exploration in cratonic settings. Using play elements derived from the model, the Bourakebougou play fairway can be extended across the Taoudeni Basin >700 km northwards of the discovery.

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The Identity of Petrophysical Properties of Oceanic Serpentinites and Continental Granitoids: Implications for the Recognition of Buried Hydrocarbon-bearing Serpentinite Geobodies

Cited by 2 publications

References 107 publications

Petrophysical characterization and thermal conductivity prediction of serpentinized peridotites

Petrophysical characterization and thermal conductivity prediction of serpentinized peridotites

Greenstones as a source of hydrogen in cratonic sedimentary basins

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