Application of Pulsed Neutron Mineralogy Tools to the Evaluation of Evaporite Deposits

Bradley, Thomas; Mendez, Freddy; Longo, J.M.; Bullen, J.; Visser, J.

doi:10.3997/2214-4609.20130799

Cited by 2 publications

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“…Legacy hydrocarbon wells such as those used in this study provide critical information on the evaporite facies distribution in the subsurface; however, log suites are often incomplete. GR, RHOB, NPHI and DT logs can be used to understand evaporite facies in the Zechstein; however, modern wireline techniques such as spectral gamma ray and pulsed neutron elemental spectroscopy techniques (Bradley et al 2013;Sullivan and Song 2017) would increase our understanding of heterogeneities within the halite units.…”

Section: Discussionmentioning

confidence: 99%

Late Permian Evaporite Facies Variation in the Forth Approaches Basin, North Sea: Implications for Hydrogen Storage

Brackenridge,

Russell,

Hartley

et al. 2024

85th EAGE Annual Conference &Amp; Exhibition (Including the Workshop Programme)

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Hydrogen is expected to play a key role in decarbonizing industry and storing energy from intermittent sources such as wind energy. Underground salt caverns are an attractive target for storage due to their large volumes and effective sealing capacity. Despite ambitious goals to become a world leader in hydrogen, there are no onshore salt basins in Scotland. Therefore, the offshore Forth Approaches Basin (FAB), currently undergoing development of the Seagreen Offshore Wind Farm, could provide a critical storage site. Re-evaluation of petrophysical data from five legacy hydrocarbon wells allowed an updated assessment of the composition and variability of the Late Permian Zechstein evaporite sequence. Well analysis is combined with seismic interpretation to understand the salt bodies and their suitability for solution mining. Three halite formations are identified: (1) the Stassfurt Halite Formation, which has insufficient thickness for solution mining; (2) the Leine Halite Formation, which comprises three subunits with a KCl-dominated unit separating two halite-dominated units; and (3) the Aller Halite Formation, which is only identified in the centre of the FAB. Where halokinesis has occurred, the Leine Halite Formation reaches sufficient thicknesses (>300 m) and purity for salt cavern placement; however, heterogeneities are challenging to predict. Layered evaporites only reach sufficient thickness where the Aller Halite Formation is present and could be developed with the underlying Leine Halite Formation. Heterogeneities can be correlated across wells within the layered sequences, aiding prediction. A strong understanding of evaporite facies distribution is required to ensure that halite bodies are suitable for safe and economic solution mining in the FAB and other salt basins globally.

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Section: Discussionmentioning

confidence: 99%

Late Permian Evaporite Facies Variation in the Forth Approaches Basin, North Sea: Implications for Hydrogen Storage

Brackenridge,

Russell,

Hartley

et al. 2024

85th EAGE Annual Conference &Amp; Exhibition (Including the Workshop Programme)

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Late Permian evaporite facies variation in the Forth Approaches Basin, North Sea: implications for hydrogen storage

et al. 2023

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Hydrogen is expected to play a key role in decarbonising industry and storing energy from intermittent sources such as wind energy. Underground salt caverns are an attractive target for storage due to large volumes and effective sealing capacity. Despite ambitious goals to become a world-leader in hydrogen, there are no onshore salt basins in Scotland. Therefore, the offshore Forth Approaches Basin (FAB), currently undergoing development of the Seagreen wind farm, could provide a critical storage site. Re-evaluation of petrophysical data from five legacy hydrocarbon wells allowed an updated assessment of the composition and variability of the Late Permian Zechstein evaporite sequence. Well analysis is combined with seismic interpretation to understand the salt bodies and their suitability for solution mining. Three halite formations are identified: (1) The Stassfurt Halite which has insufficient thickness for solution mining; (2) The Leine Halite that comprises three sub-units with a KCl-dominated unit separating two halite-dominated units; (3) The Aller Halite only identified in the centre of the FAB. Where halokinesis has occurred, the Leine Halite reaches sufficient thicknesses (>300m) and purity for salt cavern placement, however heterogeneities are challenging to predict. Layered evaporites only reach sufficient thickness where the Aller Halite is present and could be developed with the underlying Leine Halite. Heterogeneities can be correlated across wells within the layered sequences aiding prediction. A strong understanding of evaporite facies distribution is required to ensure halite bodies are suitable for safe and economic solution mining in the FAB and other salt basins globally. Thematic collection: This article is part of the Hydrogen as a future energy source collection available at: https://www.lyellcollection.org/topic/collections/hydrogen

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Application of Pulsed Neutron Mineralogy Tools to the Evaluation of Evaporite Deposits

Cited by 2 publications

References 0 publications

Late Permian Evaporite Facies Variation in the Forth Approaches Basin, North Sea: Implications for Hydrogen Storage

Late Permian Evaporite Facies Variation in the Forth Approaches Basin, North Sea: Implications for Hydrogen Storage

Late Permian evaporite facies variation in the Forth Approaches Basin, North Sea: implications for hydrogen storage

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