This dataset is used and fully described/interpreted in the paper: Passelegue, F. X., N. Brantut, T. M. Mitchell, Fault reactivation by fluid injection: Controls from stress state and injection rate, submitted to Geophys. Res. Lett. Text files contain raw and processed data. Mechanical data are raw. Load needs to corrected (offset) from piston friction, measured at the beginning of each run before the hit point. Axial displacement is converted into sample shortening by correcting the load from machine stiffness, which is equal to 480 kN/mm (calibrated on Mon. 14 Mar. 2016). Data include a set of elastic wave first arrival times, obtained from time of flight measurements using an array of piezoelectric transducers and the cross-correlation method detailed in Brantut (2015) (see reference above). Two separate files correspond to mechanical data from experiments conducted at 50 and 100 MPa confining pressure (""mech_Pc=???MPa.txt""). One file (""sensors.txt"") contains the initial positions of each piezoelectric transducer. Files named ""wave_?_Pc=100MPa.txt"" (?=1,2,3 or 4) contain time series of arrival times during the four injections conducted at Pc=100MPa. Each column consists in the time-of-flight between a given pair of sensors (x->y, where x is the index of source sensor, and y is the index of the receiver sensor, as per their numbering in the ""sensors.txt"" file.) In all the data files, the first column corresponds to a common time basis, in seconds.

PROJECT DETAILS ONLY - NO DATA. The influence of biofilm growth on the hydraulic properties of sediments and rocks will be investigated experimentally over scales from microscopic (10-10m) to macroscopic (102m). In addition, the effects of biofilms on the formation of fine oxide precipitates (FeO, OH, MnO.OH. etc.) and on the sorption behaviour of fluid transported trace impurities (U, Tc, Sr) will also be studied over these scales. These fundamental data will be obtained using a unique combination of experimental methods which will allow the results to be scaled up to field dimensions of distance and time, such that the results may be used by our industrial partners as input to field scale models of the migration of fluids and contaminants.

PROJECT DETAILS ONLY - NO DATA. The aim of the proposed project is to study evolution in the spatial characteristic of coupled flow and porosity development in heterogeneous porous media. We will develop a modelling engine and methodologies to generate porosity templates for use in flow and transport models of fractured aquifers. Although the primary motivation for this study is to enhance our ability to predict flow and contaminant transport in vulnerable fractured aquifers, such as the chalk, the approach is generic and we foresee a wide range of scenarios where the model may be applied. The work has three specific objectives: 1) to produce a generic model of porosity development, 2) to investigate percolation, scaling and self-organisation phenomena in porosity development due to flow, and 3) to model pore structure and flow histories for a range of natural and anthropogenic problems.

PROJECT DETAILS ONLY - NO DATA. This proposal is to test the hypothesis that secondary (crack) porosity can be treated as a scaling problem in both fracture and fluid percolation theory. This will be achieved by measurements of elastic, transport and mechanical properties on rock samples with known and controlled crack densities (crack porosities) that span the percolation threshold under a wide range of stress conditions. The measured data will be used to calibrate and validate generic models for fluid and fracture percolation that can then be upscaled to predict permeability at the reservoir scale from wireline logs.

PROJECT DETAILS ONLY - NO DATA. This project will use the techniques of stereolithography and PIV directly to measure the fluid velocity field in complex, 2D, geologically realistic media with multi-scaled heterogeneities. The resulting velocity fields will be published widely and will provide an invaluable resource for the validation of models of fluid flow in complex geometries for which validation ID presently impossible. Three specific studies will also be undertaken; a) a detailed investigation of the non-linear interaction between matrix and fracture flow, b) a study of the scaling laws in the region of the percolation threshold in the presence of fractal fracture populations and significant matrix permeability and c) an examination of the scaling of the velocity flow field and how this reflects material scaling with a view to identifying potential rules for upscaling of fluid simulations.

PROJECT DETAILS ONLY - NO DATA. The project will develop and explore the application of scaling methods to strongly heterogeneous flow fields; investigate the loss and retention of information by scaling over large space and long time scale ranges; and, define the dependence between large space/long time scale migration behaviour and the underlying geological model. High resolution, highly accurate flow and transport simulation data sets for a large number of realisations possessing the high variance and strong textures observed in actual geological systems using alternative geological simulators will be used to test upscaling approaches reported in the physical sciences literature and to identify improving upscaling laws where the existing laws are inadequate.

PROJECT DETAILS ONLY - NO DATA. This project will integrate micro- and meso-scale structural and geochemical data from the Irish midlands in order to understand the fluid flow and fluid mixing responsible for the development of world-class Zn-Pb orebodies. These data will be used to characterise "building blocks" of differing scales which will constrain numerical modelling of flow associated with individual faults as well as the regional system. We have assembled a multi-disciplinary, international team from Leeds, Imperial College, SURRC, Edinburgh, CSIRO (Australia) and Colorado together with assistance from Tara mines in Ireland to tackle this project.

PROJECT DETAILS ONLY - NO DATA. This project is designed to integrate geological structural characterisation of fault zones with numerical modelling of flow behaviour at different scales. We will develop a 3D flow simulator which can model the impact of geological heterogeneities (clustered fault / fracture arrays) under different stress conditions on fluid flow. The project is collaboration between a structural geology research group (the rock deformation research group), an applied mathematics group (the centre for computational fluid dynamics) and a series of industrial partners (Arco, BP, Shell and Midland Valley).

PROJECT DETAILS ONLY - NO DATA. At sub-continuum scales, pore network geometry strongly influences flow and solute transport. Fractures spaced ~0.1 to ~10m impart continuum scales to fractured aquifers which may exceed the size of many practical problems. Sub-continuum flow models often use statistical simulation of explicit fracture networks, leading to serious problems of system identification an uniqueness. This studentship will address this by determining whether tracer breakthrough curves may be used to characterise fracture topography at different scales, either as the sole evidence or in combination with bulk permeability. The main method will be a systematic exploration of the influence of fracture network topologies and scale on tracer breakthrough, using simulations on 2-D and 3-D models which represent the void space explicitly and create dispersion solely as a product of inhomogeneity in flow rate. Results will be compared with existing tracer data and used to infer the characteristics of the fracture networks involved. The outcome hoped for will be a methodology for using tracer tests to constrain fracture geometry in unknown cases.

to provide reliable molecular fingerprints for biodegraded crude oils and contaminated sediment cores and to facilitate correlation studies The aim is to demonstrate the potential of hydropyrolysis (pyrolysis assisted by high hydrogen gas pressure) as a novel means to provide reliable molecular fingerprints for biodegraded oils and contaminated cores where conventional biomarker approaches fail. This will then facilitate accurate and rapid oil-source and oil-oil correlations to be determined for the first time in these situations. New experimental protocols for conducting hydropyrolysis on asphaltenes will be developed. The study will establish a firm base to exploit the commercial potential of hydropyrolysis, both in oil exploration and for characterising sedimentary organic matter as a far superior technique to pyrolysis-GC-MS through a larger industrial partner.