I am a petroleum geochemist and environmental scientist with a range of research interests across the energy portfolio. I have a PhD in Petroleum Geochemistry (2001), and an MSc in Environmental Biogeochemistry (1996) both from the University of Newcastle upon Tyne. My BSc was in Geological Sciences (1994) from the University of Leeds, and have been with the University of Nottingham since 2001.
I am a member of the Low Carbon Energy and Resources Technologies Research Group.
My current teaching includes modules on Fossil Energy Resources (H84FER), Environmental Risk Assessment (H84ERA) and Introductory Geology (H81ING), together with assisting with undergraduate labs, field courses and design projects.
My research specialises in developing innovative pyrolysis techniques to tackle applications in petroleum geochemistry where traditional techniques fail. Over the past 18 years I have lead the… read more
LI, W., STEVENS, L. A., MEREDITH, W., UGUNA, C. N., VANE, C. H., ZHANG, B., CARR, A. D., ZHENG, D. and SNAPE, C. E., 2022. The effect of oil extraction on porosity and methane adsorption for dry and moisture-equilibrated shales: Fuel Fuel. 316, LI, W., STEVENS, L. A., UGUNA, C. N., VANE, C. H., MEREDITH, W., TANG, L., LI, Q. and SNAPE, C. E., 2021. Comparison of the impact of moisture on methane adsorption and nanoporosity for over mature shales and their kerogens: International Journal of Coal Geology International Journal of Coal Geology. 237,
DURAN-JIMENEZ, GABRIELA, KOSTAS, EMILY T, STEVENS, LEE A, MEREDITH, WILL, ERANS, MARIA, HERNANDEZ-MONTOYA, VIRGINIA, BUTTRESS, ADAM, UGUNA, CLEMENT N and BINNER, ELEANOR, 2021. Green and simple approach for low-cost bioproducts preparation and CO2 capture. Chemosphere. 279, 130512
My research specialises in developing innovative pyrolysis techniques to tackle applications in petroleum geochemistry where traditional techniques fail. Over the past 18 years I have lead the development and commercialisation of hydropyrolysis (HyPy) as a novel pyrolysis technique for the characterisation of organic macromolecules. The use of high hydrogen pressure and suitable catalysts gives HyPy the unique ability to liberate high yields of hydrocarbon biomarkers covalently bound within source rock kerogens and petroleum asphaltenes, whilst minimising their structural or stereochemical alteration. This enables the technique to be used for petroleum geochemical applications where conventional approaches using the "free" solvent extractable biomarkers cannot be employed including the characterisation and correlation of heavily biodegraded oils, samples contaminated by oil-based drilling mud, oil field solids (tar mats/pyrobitumens), and for deciphering basin filling history of migrated petroleum fluids.
The successful commercialisation of HyPy was achieved in collaboration with our licensed manufacturing partner, Strata Technology, with sales of 13 systems to academic and industrial institutions in the UK, Germany, USA, China and Australia. HyPy is also regularly utilised on a commercial basis by companies within the oil and gas sector including upstream E&P (e.g. Shell; Chevron; Cairn Energy; Unocal), downstream fuel technology (e.g. Innospec, Nalco) as well as UK oil service companies (e.g. Roberston; GeoMark Research; IGI). The commercialisation of HyPy was a winner in the Business Support to Universities category of the Engineer Technology & Innovation Awards 2008, and was highlighted as an example of knowledge transfer in the 2007 NERC annual report.
Outside of petroleum geochemistry HyPy has gained prominence in a diverse range of applications with high impact studies published on the characterisation of the macromolecular carbonaceous material within meteorites [Sephton et al., 2005. PSS, 53, 1280-1286),], investigating the nature of deposits in fuel injection equipment [Barker et al., 2009; SAE 2, 38-44], the isotopic analysis of steroids [Meredith et al., 2010. RCMS 24, 501-505], identification of the earliest recorded evidence of animal life on earth [Love et al., 2009. Nature 457, 718-722], and the isolation, quantification and characterisation of pyrogenic carbon in environmental samples [Meredith et al., 2012. GCA 97, 131-147].
Our experience with high pressure systems, together with the absence of a pressure term (as dictated by chemical theory) from the temperature-time based first-order kinetic models that are currently used in basin modelling have led us to investigate the role of water pressure on hydrocarbon generation, maturation and cracking. This has developed into a long-running joint industry/academic research programme funded by Statoil and Woodside Energy. In contrast to many published pyrolysis studies (primarily conducted using gold bags) our work has demonstrated that high liquid water pressures (500-900 bar) significantly retard thermal maturity (as measured by source rock vitrinite reflectance and aromaticity) and hydrocarbon generation (as measured by decreased bitumen and C1-C4 gas yields) [e.g. Carr et al., 2009. Pet. Geosci. 15, 17-26; Uguna et al., 2012. OG 52, 103-113].
I welcome enquiries from potential PhD candidates from Home, EU and International countries who are interested in the following research areas: Petroleum geochemistry, oil biodegradation, analytical pyrolysis, biomass conversion, isolation and quantification of pyrogenic carbon & biochar.