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Instruments / Technical Area	Publication Details	Published
I13-2-Diamond Manchester Imaging	Spatial distribution of mineral development in Carboniferous Bowland Shale, UK at 3D micro- to nano- scales Jingyue Hao , Lin Ma , Cathy Hollis , Anne-Laure Fauchille , Kevin G. Taylor International Journal Of Coal Geology 41 DOI: 10.1016/j.coal.2023.104236 Diamond Proposal Number(s): [15506] Open Access Show Abstract ▼ Abstract: Determination of mineral texture and diagenetic features in mudstones is crucial to reveal the history of their pore systems and provides key information to predict their future sealing ability, reactivity and storage capacity for sequestered CO2, hydrogen storage or nuclear waste disposal. To understand the spatial transport and storage of fluids, it is necessary to map the distribution of minerals and fractures in three dimensions (3D). This study proposes a novel, multi-scale three-dimensional (3D) imaging method, i.e., a combination of synchrotron- sourced micro- x-ray tomography and lab- sourced nano-tomography, to investigate the sedimentology and diagenetic features of the Bowland Shale, one of the most volumetrically important mudstone-dominated systems in the UK. Diagenetic minerals have been identified and characterised, including pyrite, calcite, kaolinite, illite, chlorite, dolomite, ankerite and authigenic quartz (micro-sized quartz and quartz overgrowths). Multi-scale 3D images provide detailed information about dolomite-ankerite zonation and carbonate dissolution pores. These features cannot be observed or quantified by conventional 2D methods, and they have not been reported in this subject area before. Using these results, potential reactions during carbon storage and other subsurface storage applications are predicted.	Apr 2023
I13-2-Diamond Manchester Imaging	Permeability and acoustic velocity controlling factors determined from x-ray tomography images of carbonate rocks Nathaly L. Archilla , Roseane M. Missagia , Cathy Hollis , Marco A. R. De Ceia , Samuel A. Mcdonald , Irineu A. Lima Neto , David S. Eastwood , Peter Lee Aapg Bulletin 100, 1289 - 1309 DOI: 10.1306/02251615044 Diamond Proposal Number(s): [4017] Open Access Show Abstract ▼ Abstract: Carbonate reservoir rocks exhibit a great variability in texture that directly impacts petrophysical parameters. Many exhibit bi- and multimodal pore networks, with pores ranging from less than 1 μm to several millimeters in diameter. Furthermore, many pore systems are too large to be captured by routine core analysis, and well logs average total porosity over different volumes. Consequently, prediction of carbonate properties from seismic data and log interpretation is still a challenge. In particular, amplitude versus offset classification systems developed for clastic rocks, which are dominated by connected, intergranular, unimodal pore networks, are not applicable to carbonate rocks. Pore geometrical parameters derived from digital image analysis (DIA) of thin sections were recently used to improve the coefficient of determination of velocity and permeability versus porosity. Although this substantially improved the coefficient of determination, no spatial information of the pore space was considered, because DIA parameters were obtained from two-dimensional analyses. Here, we propose a methodology to link local and global pore-space parameters, obtained from three-dimensional (3-D) images, to experimental physical properties of carbonate rocks to improve P-wave velocity and permeability predictions. Results show that applying a combination of porosity, microporosity, and 3-D geometrical parameters to P-wave velocity significantly improves the adjusted coefficient of determination from 0.490 to 0.962. A substantial improvement is also observed in permeability prediction (from 0.668 to 0.948). Both results can be interpreted to reflect a pore geometrical control and pore size control on P-wave velocity and permeability.	Aug 2016
I13-2-Diamond Manchester Imaging	3D pore structure investigation of Albian carbonates from Campos Basin N. Lopes Archilha , R. M. Missagia , C. Hollis , M. A. R. Ceia , I. A. Lima Neto , D. Eastwood Null 76th EAGE Conference and Exhibition 2014 DOI: 10.3997/2214-4609.20141280 Diamond Proposal Number(s): [4017] Show Abstract ▼ Abstract: The pore structure of three samples from two neighbouring wells in the Campos Basin, offshore Brazil, were investigated by high resolution X-ray tomography. The samples show an inverse relationship between velocity and porosity and velocity and permeability, but there are important deviations on those trends. In order to explain this behavior, the sample pore structure was investigated using a high resolution µCT. This technique provided reliable information about 3D geometry of macropores and allowed estimation of the volume of microporosity. The analysis showed an expressive difference between the pore size of samples with different textures, but not enough information to explain differences in RQI values, suggesting that other parameters, like tortuosity, are controlling permeability. The aspect ratio (ratio between width and length) does not offer a clear control on velocity trend deviation, suggesting that small differences in rock texture or cement distribution might be in control of acoustic properties of these rocks.	Jun 2014

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