Negation Invariant Representations of 3D Vectors for Deep Learning Models applied to Fault Geometry Mapping in 3D Seismic Reflection Data (2023)
Journal Article
Kluvanec, D., McCaffrey, K. J., Phillips, T. B., & Al Moubayed, N. (2023). Negation Invariant Representations of 3D Vectors for Deep Learning Models applied to Fault Geometry Mapping in 3D Seismic Reflection Data. IEEE Transactions on Geoscience and Remote Sensing, https://doi.org/10.1109/tgrs.2023.3273329

We can represent the orientation of a plane in 3D by its normal vector. However, every plane has two normal vectors that are negatives of each other. We propose four novel representations of vectors in 3D that are negation invariant and can be used b... Read More about Negation Invariant Representations of 3D Vectors for Deep Learning Models applied to Fault Geometry Mapping in 3D Seismic Reflection Data.

Effect of Structural Fe Reduction on Water Sorption by Swelling and Non-Swelling Clay Minerals (2022)
Journal Article
Vasilopanagos, C., Carteret, C., Hillier, S., Neumann, A., Brooksbank, H. J., & Greenwell, H. C. (2022). Effect of Structural Fe Reduction on Water Sorption by Swelling and Non-Swelling Clay Minerals. Minerals, 12(4), Article 453. https://doi.org/10.3390/min12040453

Ferruginous clay minerals in saturated soils and within hydrocarbon deposits often exist in a reduced state. Upon introduction of dissolved oxygen, or other oxidants, the clay minerals oxidise and changes in mineral surface charge and sorption capaci... Read More about Effect of Structural Fe Reduction on Water Sorption by Swelling and Non-Swelling Clay Minerals.

Chemical Force Microscopy Study on the Interactions of COOH Functional Groups with Kaolinite Surfaces: Implications for Enhanced Oil Recovery (2017)
Journal Article
Santha, N., Cubillas, P., Saw, A., Brooksbank, H., & Greenwell, H. C. (2017). Chemical Force Microscopy Study on the Interactions of COOH Functional Groups with Kaolinite Surfaces: Implications for Enhanced Oil Recovery. Minerals, 7(12), Article 250. https://doi.org/10.3390/min7120250

Clay–oil interactions play a critical role in determining the wettability of sandstone oil reservoirs, which, in turn, governs the effectiveness of enhanced oil recovery methods. In this study, we have measured the adhesion between –COOH functional g... Read More about Chemical Force Microscopy Study on the Interactions of COOH Functional Groups with Kaolinite Surfaces: Implications for Enhanced Oil Recovery.

Analytical solution for clay plug swelling experiments (2017)
Journal Article
Mathias, S., Greenwell, H., Withers, C., Erdogan, A., McElwaine, J., & MacMinn, C. (2017). Analytical solution for clay plug swelling experiments. Applied Clay Science, 149, 75-78. https://doi.org/10.1016/j.clay.2017.07.021

Clay swelling experiments frequently involve monitoring the one-dimensional displacement with time of an initially dry clay plug as it imbibes water from a supply at its base. This article presents a new analytical solution for interpreting such expe... Read More about Analytical solution for clay plug swelling experiments.

Translocation of isotopically distinct macroalgae: a route to low-cost biomonitoring? (2017)
Journal Article
Gröcke, D., Racionero-Gómez, B., Marschalek, J., & Greenwell, H. (2017). Translocation of isotopically distinct macroalgae: a route to low-cost biomonitoring?. Chemosphere, 184, 1175-1185. https://doi.org/10.1016/j.chemosphere.2017.06.082

Nitrogen stable isotope ratios (δ15N) in macroalgae are often used to identify sources of nitrogenous pollution in fluvial and estuarine settings. This approach assumes that the macroalgal δ15N is representative of the sources of the pollution averag... Read More about Translocation of isotopically distinct macroalgae: a route to low-cost biomonitoring?.

Osmium uptake, distribution, and 187Os/188Os and 187Re/188Os compositions in Phaeophyceae macroalgae, Fucus vesiculosus: Implications for determining the 187Os/188Os composition of seawater (2016)
Journal Article
Racionero-Gómez, B., Sproson, A., Selby, D., Gannoun, A., Gröcke, D., Greenwell, H., & Burton, K. (2016). Osmium uptake, distribution, and 187Os/188Os and 187Re/188Os compositions in Phaeophyceae macroalgae, Fucus vesiculosus: Implications for determining the 187Os/188Os composition of seawater. Geochimica et Cosmochimica Acta, 199, 48-57. https://doi.org/10.1016/j.gca.2016.11.033

The osmium isotopic composition (187Os/188Os) of seawater reflects the balance of input from mantle-, continental- and anthropogenic-derived sources. This study utilizes the Phaeophyceae, Fucus vesiculosus, to analyse its Os abundance and uptake, as... Read More about Osmium uptake, distribution, and 187Os/188Os and 187Re/188Os compositions in Phaeophyceae macroalgae, Fucus vesiculosus: Implications for determining the 187Os/188Os composition of seawater.

Changes in higher heating value and ash content of seaweed during ensiling (2016)
Journal Article
Redden, H., Milledge, J. J., Greenwell, H. C., Dyer, P. W., & Harvey, P. J. (2017). Changes in higher heating value and ash content of seaweed during ensiling. Journal of Applied Phycology, 29(2), 1037-1046. https://doi.org/10.1007/s10811-016-0975-4

A problem in the use of macroalgae for biofuel is that harvesting of seaweed is generally seasonal, and there is a need to preserve and store seaweed to supply year-round production processes. Ensiling is a widely used preservation method in agricult... Read More about Changes in higher heating value and ash content of seaweed during ensiling.

Multi-technique approach to the petrophysical characterization of Berea sandstone core plugs (Cleveland Quarries, USA) (2016)
Journal Article
Kareem, R., Cubillas, P., Gluyas, J., Bowen, L., Hillier, S., & Greenwell, H. (2017). Multi-technique approach to the petrophysical characterization of Berea sandstone core plugs (Cleveland Quarries, USA). Journal of Petroleum Science and Engineering, 149, 436-455. https://doi.org/10.1016/j.petrol.2016.09.029

Berea sandstone has been used by the petroleum industry as a representative model siliciclastic rock for a number of years. However, only incomplete data has been reported in the literature regarding its petrographic, geochemical, and petrophysical p... Read More about Multi-technique approach to the petrophysical characterization of Berea sandstone core plugs (Cleveland Quarries, USA).

Ion Adsorption at Clay Mineral Surfaces: The Hofmeister Series for Hydrated Smectite Minerals (2016)
Journal Article
Underwood, T., Erastova, V., & Greenwell, H. (2016). Ion Adsorption at Clay Mineral Surfaces: The Hofmeister Series for Hydrated Smectite Minerals. Clays and Clay Minerals, 64(4), 472-487. https://doi.org/10.1346/ccmn.2016.0640310

Many important properties of clay minerals are defined by the species of charge-balancing cation. Phenomena such as clay swelling and cation exchange depend on the cation species present, and understanding how the cations bind with the mineral surfac... Read More about Ion Adsorption at Clay Mineral Surfaces: The Hofmeister Series for Hydrated Smectite Minerals.

Rhenium uptake and distribution in phaeophyceae macroalgae, Fucus vesiculosus (2016)
Journal Article
Racionero-Gómez, B., Sproson, A., Selby, D., Gröcke, D., Redden, H., & Greenwell, H. (2016). Rhenium uptake and distribution in phaeophyceae macroalgae, Fucus vesiculosus. Royal Society Open Science, 3(5), Article 160161. https://doi.org/10.1098/rsos.160161

Owing to Rhenium (Re) having no known biological role, it is not fully understood how Re is concentrated in oil kerogens. A commonly held assumption is that Re is incorporated into decomposing biomass under reducing conditions. However, living macroa... Read More about Rhenium uptake and distribution in phaeophyceae macroalgae, Fucus vesiculosus.

Wetting Effects and Molecular Adsorption at Hydrated Kaolinite Clay Mineral Surfaces (2016)
Journal Article
Underwood, T., Erastova, V., & Greenwell, H. (2016). Wetting Effects and Molecular Adsorption at Hydrated Kaolinite Clay Mineral Surfaces. Journal of Physical Chemistry C, 120(21), 11433-11449. https://doi.org/10.1021/acs.jpcc.6b00187

In this study, classical molecular dynamics simulations have been used to understand the key interactions and surface structure of a set of organic molecules at the hydrated surfaces of the 1:1 clay mineral kaolinite. Decane, decanoic acid, and decan... Read More about Wetting Effects and Molecular Adsorption at Hydrated Kaolinite Clay Mineral Surfaces.

Geochemical and lithological controls on a potential shale reservoir: Carboniferous Holywell Shale, Wales (2015)
Journal Article
Newport, L. P., Aplin, A. C., Gluyas, J. G., Greenwell, H. C., & Gröcke, D. R. (2015). Geochemical and lithological controls on a potential shale reservoir: Carboniferous Holywell Shale, Wales. Marine and Petroleum Geology, 71, 198-210. https://doi.org/10.1016/j.marpetgeo.2015.11.026

The Holywell Shale is part of the Carboniferous Bowland Shale Formation, identified as the main potential shale gas system in the UK. Here, we report geochemical and petrographic data from five outcrops of the Lower and Upper Holywell Shale across no... Read More about Geochemical and lithological controls on a potential shale reservoir: Carboniferous Holywell Shale, Wales.

Towards a Mechanistic Understanding of Carbon Stabilization in Manganese Oxides (2015)
Journal Article
Johnson, K., Purvis, G., Lopez-Capel, E., Peacock, C., Gray, N., Wagner, T., …Greenwell, C. (2015). Towards a Mechanistic Understanding of Carbon Stabilization in Manganese Oxides. Nature Communications, 6, Article 7628. https://doi.org/10.1038/ncomms8628

Minerals stabilize organic carbon (OC) in sediments, thereby directly affecting global climate at multiple scales, but how they do it is far from understood. Here we show that manganese oxide (Mn oxide) in a water treatment works filter bed traps dis... Read More about Towards a Mechanistic Understanding of Carbon Stabilization in Manganese Oxides.

The effect of interbedding on shale reservoir properties (2015)
Journal Article
Raji, M., Gröcke, D., Greenwell, H., Gluyas, J., & Cornford, C. (2015). The effect of interbedding on shale reservoir properties. Marine and Petroleum Geology, 67, 154-169. https://doi.org/10.1016/j.marpetgeo.2015.04.015

North Sea oil is overwhelmingly generated in shales of the Upper Jurassic – basal Cretaceous Kimmeridge Clay Formation. Once generated, the oil is expelled and ultimately migrates to accumulate in sandstone or carbonate reservoirs. The source rock sh... Read More about The effect of interbedding on shale reservoir properties.

Molecular Dynamic Simulations of Montmorillonite-Organic Interactions under Varying Salinity: An Insight into Enhanced Oil Recovery (2015)
Journal Article
Underwood, T., Erastova, V., Cubillas, P., & Greenwell, H. (2015). Molecular Dynamic Simulations of Montmorillonite-Organic Interactions under Varying Salinity: An Insight into Enhanced Oil Recovery. Journal of Physical Chemistry C, 119(13), 7282-7294. https://doi.org/10.1021/acs.jpcc.5b00555

Enhanced oil recovery is becoming commonplace in order to maximize recovery from oil fields. One of these methods, low-salinity enhanced oil recovery (EOR), has shown promise; however, the fundamental underlying chemistry requires elucidating. Here,... Read More about Molecular Dynamic Simulations of Montmorillonite-Organic Interactions under Varying Salinity: An Insight into Enhanced Oil Recovery.

Copper(II)-mediated thermolysis of alginates: a model kinetic study on the influence of metal ions in the thermochemical processing of macroalgae (2012)
Journal Article
Rowbotham, J., Dyer, P., Greenwell, H., Selby, D., & Theodorou, M. (2012). Copper(II)-mediated thermolysis of alginates: a model kinetic study on the influence of metal ions in the thermochemical processing of macroalgae. Interface Focus, 3(1), https://doi.org/10.1098/rsfs.2012.0046

Thermochemical processing methods such as pyrolysis are of growing interest as a means of converting biomass into fuels and commodity chemicals in a sustainable manner. Macroalgae, or seaweed, represent a novel class of feedstock for pyrolysis that,... Read More about Copper(II)-mediated thermolysis of alginates: a model kinetic study on the influence of metal ions in the thermochemical processing of macroalgae.