Petrophysical characterization and thermal conductivity prediction of serpentinized peridotites

Chibati, Nadjib; Géraud, Yves; Essa, Khalid S.

doi:10.1093/gji/ggac288

Cited by 2 publications

(1 citation statement)

References 106 publications

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“…The ultrasonic compressional wave velocity and shear wave velocity were measured for using a Punditlab pulse generator delivered by Proceeq R (Chibati et al 2022 ) in dry and saturated conditions. We used two piezoelectric transducers of 54 and 250 kHz for Pwave and S -wave acquisitions, respectively.…”

Section: Other Measurementsmentioning

confidence: 99%

Induced polarization of volcanic rocks – 6: relationships with other petrophysical properties

Zhang

Chibati

Revil

et al. 2023

Geophysical Journal International

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Summary The petrophysical properties of 41 volcanic samples from La Soufrière volcanoe (Guadeloupe Island, Eastern Caribbean, France) are investigated. We first measure the complex conductivity spectra of these rock samples at 4 salinities (NaCl) at laboratory conditions (∼20° C). For each rock sample, we determine the (intrinsic) formation factor, the surface conductivity, and the Cole Cole normalized chargeability (Ghorbani et al., 2007). We also measure the compressional wave velocity (dry and saturated), the shear wave velocity in saturated conditions, the (dry and saturated) thermal conductivity, the dry specific heat capacity, and the permeability of the rock samples as well as their cation exchange capacity (CEC) and connected porosity. The formation factor versus porosity obeys Archie's law with a cementation exponent of 2.16 ± 0.10. The surface conductivity and the normalized chargeability are proportional to each other and to the CEC divided by the tortuosity of the material (product of the formation factor by the connected porosity) as predicted by the dynamic Stern layer model. Permeability can be predicted from the normalized chargeability and the formation factor inside one order of magnitude. The thermal conductivity and the seismic properties can be evaluated from the connected porosity of the core samples formation factors. A non-linear relationship is established between the shear wave velocity and the compressional wave velocity for the present dataset and other data from the literature. Finally, we show on a specific example, how to convert an induced polarization survey on a strato-volcano into a seismic velocity model (P- and S-waves velocity distributions). We perform a specific application to Papandayan Volcano, a strato-volcano located in Java Island (Indonesia). This work paves the way to the joint inversion problem of seismic and induced polarization surveys for volcanic unrest monitoring.

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Section: Other Measurementsmentioning

confidence: 99%

Induced polarization of volcanic rocks – 6: relationships with other petrophysical properties

Zhang

Chibati

Revil

et al. 2023

Geophysical Journal International

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Serpentinization and Magmatic Distribution in a Hyperextended Rift Suture: Implication for Natural Hydrogen Exploration (Mauléon Basin, Pyrenees)

Saspiturry,

Allanic,

Peyrefitte

2024

Tectonics

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The Mauléon basin is a world‐class example of hyperextended rift suture. The basin possesses key attributes of an optimal hydrogen target, namely mantle, at shallow depth with tectonic structures rooted into it. Natural H2 seepages have been recognized at the surface in the foothills. Yet distribution and quantification of serpentinization within the mantel piece representing the potential H2 source has not been addressed while this aspect is crucial to consider further exploration. We discuss these aspects using joint gravimetric and magnetic 2D forward modeling along two orthogonal transects. 2D forward modeling shows that serpentinization gradually increases from bottom (20 km depth) to top reaching a maximum amount of nearly 76% (8 km depth). The N‐S transect evidence that serpentinization fronts are northward inclined, suggesting a N‐S serpentinization gradient responsible for the long wavelength gravity and magnetic anomalies. This orientation matches that of detachment within the former hyperextended domain, which exhumed the mantle during the Cretaceous. The W‐E transect shows that serpentinization also increase toward the east reaching its maximum amount against the Barlanès lithospheric structure. The latter also coincides with the main short wavelength magnetic anomaly recognized in the basin. Forward geophysical modeling reveals that this anomaly could be linked to the presence, at shallow depth, of an alkaline magmatic body or a shallower piece of highly serpentinized subcontinental mantle both attesting for the paroxysm of the Cretaceous rifting phase. Finally, we propose a conceptual model of the H2 life cycle in the Mauléon basin and discuss the implications for H2 exploration.

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Petrophysical characterization and thermal conductivity prediction of serpentinized peridotites

Cited by 2 publications

References 106 publications

Induced polarization of volcanic rocks – 6: relationships with other petrophysical properties

Induced polarization of volcanic rocks – 6: relationships with other petrophysical properties

Serpentinization and Magmatic Distribution in a Hyperextended Rift Suture: Implication for Natural Hydrogen Exploration (Mauléon Basin, Pyrenees)

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