A5058746735- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Enhanced Oil Recovery Techniques
- Geological formations and processes
- CO2 Sequestration and Geologic Interactions
- Seismic Imaging and Inversion Techniques
- Advanced X-ray and CT Imaging
- Geological and Geophysical Studies
- Medical Imaging Techniques and Applications
- Planetary Science and Exploration
- NMR spectroscopy and applications
- Astro and Planetary Science
- Geochemistry and Geologic Mapping
- Landslides and related hazards
- Seismology and Earthquake Studies
- Nuclear Physics and Applications
- Paleontology and Stratigraphy of Fossils
- Advanced X-ray Imaging Techniques
- Hydraulic Fracturing and Reservoir Analysis
- Mineral Processing and Grinding
- Geological Formations and Processes Exploration
- Geological and Geophysical Studies Worldwide
Durham University
2016-2024
University of Strathclyde
2020-2024
University of Southampton
2020
University of Manchester
2012-2017
Ludwig-Maximilians-Universität München
2015-2017
Rio Tinto (United Kingdom)
2016
Imperial College London
2005-2016
Research Complex at Harwell
2014-2016
Rutherford Appleton Laboratory
2016
Manchester University
2015
X-ray computed tomography and serial block face scanning electron microscopy imaging techniques were used to produce 3D images with a resolution spanning three orders of magnitude from ∼7.7 μm 7 nm for one typical Bowland Shale sample Northern England, identified as the largest potential shale gas reservoir in UK. These quantitatively assess size, geometry connectivity pores organic matter. The data revealed four types porosity: intra-organic pores, interface intra- inter-mineral pores. Pore...
Page 2 of 19Gas-driven filter pressing is the process melt expulsion from a volatilesaturated crystal mush, induced by buildup and subsequent release gas pressure.Filter inferred to play major role in magma fractionation at shallow depths (< 10 km) moving relative solid, crystalline framework.However, magmatic conditions which this operates remain poorly constrained.We present novel experimental data that illustrate how content mush affects ability gas-driven pressing.Hydrous haplogranitic...
Petrographic analysis of eight CM carbonaceous chondrites (EET 96029, LAP 031166, LON 94101, MET 01072, Murchison, Murray, SCO 06043, QUE 93005) by electron imaging and diffraction, X-ray computed tomography, reveals that six them have a petrofabric defined shock flattened chondrules. With the exception those CMs strong also contain open or mineralized fractures, indicating tensional stresses accompanying impacts were sufficient to locally exceed yield strength meteorite matrix. The studied...
We conduct experiments to investigate the sintering of high-viscosity liquid droplets. Free-standing cylinders spherical glass beads are heated above their transition temperature, causing them densify under surface tension. determine evolving volume bead pack at high spatial and temporal resolution. use these data test a range existing models. extend models account for time-dependent droplet viscosity that results from non-isothermal conditions, non-zero final porosity. also present method...
Abstract Surtseyan eruptions are shallow to emergent subaqueous explosive that owe much of their characteristic behavior the interaction magma with water. The difference in thermal properties between water and air affects cooling postfragmentation vesiculation processes erupted into column. Here we study during 2009 2014–2015 Hunga Tonga‐Hunga Ha'apai volcano by combining 2‐D 3‐D vesicle‐scale analyses lapilli bombs numerical modeling. Most show gradual textural variations from rim core....
Sintering-or coalescence-of viscous droplets is an essential process in many natural and industrial scenarios. Current physical models of the dynamics sintering are limited by lack explicit account evolution microstructural geometry. Here, we use high-speed time-resolved x-ray tomography to image evolving geometry a system droplets, lattice Boltzmann simulations creeping fluid flow through reconstructed pore space determine its permeability. We identify characterize topological inversion,...
Engineered subsurface barriers with reduced porosity and permeability are critical for safe storage of CO2 H2, the prevention pollutant transport, several other flow challenges. This study investigates enzyme-induced carbonate precipitation (EICP), a promising technique potential to achieve uniform in otherwise inaccessible regions, provided mechanisms pore-scale mixing well understood. High-speed lab x-ray computed tomography modelling were used reagent precipitation. Our experiments show...
Fluid-rock interaction represents a common geological process that is highly dynamic and may cause substantial microscale petrophysical geochemical changes both in static syn-deformational environment. Understanding how these local dynamics occur crucial to comprehend macroscale behaviour of the lithosphere, for advancing critical subsurface engineering challenges, such as carbon capture storage; that, together with hydrogen storage geothermal energy recovery, vital transition. With advance...
We have developed a diode laser (25 W, 808 nm) system for He extraction from minerals (U‐Th)/He chronometry. The beam is delivered via 600 μm fiber cable and focused using binocular microscope. Temperatures necessary release apatite (500–600°C) zircon (1100–1300°C) encapsulated in Pt‐foil tubes are attained by heating to 0.5 W 30 s 1.25–2.5 20 min, respectively, defocused beam. Heating at these powers does not result measurable U and/or Th loss apatite, as noted the preservation of distinct...
The study of fluid flow through solid matter by computed tomography (CT) imaging has many applications, ranging from petroleum and aquifer engineering to biomedical, manufacturing, environmental research. To avoid motion artifacts, current experiments are often limited slow dynamics. This severely limits the applicability technique. In this paper, a new iterative CT reconstruction algorithm for improved temporal/spatial resolution in is introduced. proposed exploits prior knowledge two ways....
Abstract. Computed tomography has become a routine method for probing processes in porous media, and the use of neutron imaging is especially suited to study dynamics hydrogenous fluids, fluids high-density matrix. In this paper we give an overview recent developments both instrumentation methodology at facilities NEUTRA ICON Paul Scherrer Institut. Increased acquisition rates coupled new reconstruction techniques improve information output fewer projection data, which leads higher volume...
X-ray micro-tomography (XMT) is increasingly used for the quantitative analysis of volumes features within 3D images. As with any measurement, there will be error and uncertainty associated these measurements. In this paper a method quantifying both systematic random components in measured volume presented. The offset between actual which consistent different measurements can therefore eliminated by appropriate calibration. XMT often caused an inappropriate threshold value. not could caused,...
Abstract Unconventional hydrocarbon resources found across the world are driving a renewed interest in mudrock hydraulic fracturing methods. However, given difficulty safely measuring various controlling factors natural environment, considerable challenges remain understanding fracture process. To investigate, we report new laboratory study that simulates using conventional triaxial apparatus. We show orientation is primarily controlled by external stress conditions and inherent rock...
X-ray tomographic microscopy is a well-established analysis technique in different fields of the Earth Sciences to access volumetric information internal microstructure large variety opaque materials with high-spatial resolution and non-destructive manner. Synchrotron radiation, its coherence high flux, required for pushing temporal into second sub-second regime beyond, therefore moving from investigation static samples study fast dynamic processes as they happen 3D. Over past few years,...
Volcanic ash and pyroclasts can weld when deposited hot by pyroclastic density currents, in near-vent fall deposits, or fractures volcano interiors. Welding progressively decreases the permeability of particle packs, influencing a range magmatic volcanic processes, including magma outgassing, which is an important control on eruption dynamics. Consequently, there need for quantitative model evolution during welding under conditions encountered nature. Here we present situ experiments...
The apparent leach kinetics for an ore particle within a heap leaching system depend on the chemical conditions in fluids around particle, mass transport and reaction at surface of each mineral grain. rate thus upon distribution grains, terms both size position, individual particles, as well evolution this distribution. Traditionally behaviour has been modelled using simplified relationships such shrinking core model. In paper method simulating resultant based directly 3D XMT images internal...
Abstract. A variable volume flow cell has been integrated with state-of-the-art ultra-high-speed synchrotron X-ray tomography imaging. The combination allows the first real-time (sub-second) capture of dynamic pore (micron)-scale fluid transport processes in 4-D (3-D + time). With 3-D data volumes acquired at up to 20 Hz, we perform situ experiments that high-frequency pore-scale dynamics 5–25 mm diameter samples voxel equivalent a pixel) resolutions 2.5 3.8 µm. are free from motion...
The performance of heap leaching is dictated by a large number processes acting at wide range length scales. One important scale that the individual particles, where interaction between rate kinetics surfaces mineral grains and mass transport through particle combine to give overall apparent kinetics. It has been recognised for long time variability in mineralogy, size spatial distribution within are likely have effect on leach its thus, ultimately, heap. In this paper new method quantifying...
Magmas vesiculate during ascent, producing complex interconnected pore networks, which can act as outgassing pathways and then deflate or compact to volcanic plugs. Similarly, in-conduit fragmentation events dome-forming eruptions create open systems transiently, before welding causes sealing. The percolation threshold is the first-order transition between closed- open-system degassing dynamics. Here, we use time-resolved, synchrotron-source X-ray tomography image synthetic magmas that go...
ABSTRACT Chlorite is recognized as a key mineral for preserving reservoir quality in deeply buried sandstones, chlorite coatings inhibit the nucleation of quartz overgrowths. A limited understanding mechanisms and conditions under which these authigenic form prevents accurate forward modeling diagenesis limits models critical to wide range geoscience applications. We present experimental data that show how grain preserve porosity sandstone reservoirs, using series hydrothermal reactor...