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  • Journal article
    saunders J, jackson M, pain C, 2008,

    Fluid flow monitoring in oilfields using downhole measurements of electrokinetic potential

    , Geophysics, Vol: 73, Pages: E165-E180

    Downhole measurements of electrokinetic potential are a promising new technology for hydrocarbon reservoir monitoring. Using a 3Dfinite-element model combining both multiphase flow and electrokinetic components, we investigated the behavior of electrokinetic (streaming) potential during oil production in a range of reservoir environments. We found that streaming-potential signals originate at fluid fronts and at geologic boundaries where fluid saturation changes. As water encroaches on an oil production well, the streaming-potential signal associated with the water front encompasses the well even when the front is up to 100 m away, so the potential measured at the well starts to change significantly relative to a distant reference electrode. Variations in the geometry of the encroaching water front can be characterized using an array of electrodes positioned along the well, but a good understanding of the local reservoir geology is required to identify signals caused by the front. The streaming potential measured at a well is maximized in low-permeability reservoirs produced at a high rate and in thick reservoirs with low shale content. However, considerable uncertainties remain, particularly relating to the nature of electrokinetic coupling at high salinity and during multiphase flow. Our results suggest that the streaming potential at low salinity (10^-3–10^-4 mol/L) is large (100–1000 mV) but might become too small to resolve (<0.1) mV at high salinity (0.5–2 mol/L), depending on how the available data for the electrokinetic coupling at low salinity are extrapolated into the high-salinity domain. More work remains to determine the behavior of electrokinetic coupling and therefore the utility of this technique at high salinity.

  • Conference paper
    van Reeuwijk M, Mathias SA, Simmons CT, Ward JDet al., 2008,

    Improving the worthiness of the Elder problem as a benchmark for buoyancy driven convection models

    , Virtual Conference on Climate Change and CO2 Storage, Publisher: Nature Precedings
  • Journal article
    van Reeuwijk M, Jonker HJJ, Hanjalic K, 2008,

    Wind and boundary layers in Rayleigh-Benard convection. II. Boundary layer character and scaling

    , PHYS REV E, Vol: 77
  • Journal article
    Jonoud S, Jackson MD, 2008,

    Validity of Steady-State Upscaling Techniques

    , SPE Reservoir Evaluation and Engineering, Vol: April, Pages: 405-416
  • Conference paper
    Zdravkovic L, Kontoe S, 2008,

    Some issues in modelling boundary conditions in dynamic geotechnical analysis

    , 12th International Conference of International Association for Computer Methods and Advances in Geomechanics (IACMAG), Pages: 2918-2925
  • Journal article
    Sargeant SL, Stafford PJ, Lawley R, Weatherill G, Weston A-J, Bommer JJ, Burton PW, Free M, Musson RMW, Kuuyuor T, Rossetto Tet al., 2008,

    Observations from the Folkestone, U.K., earthquake of 28 April 2007

    , Seismological Research Letters, Vol: 79, Pages: 672-687
  • Conference paper
    Málaga-Chuquitaype C, Bommer JJ, Pinho R, Stafford PJet al., 2008,

    Selection and scaling of ground-motion records for nonlinear response-history analyses based on equivalent SDOF systems

    , 14th World Conference on Earthquake Engineering
  • Conference paper
    Addiego-Guevara EA, Jackson MD, Giddens MA, 2008,

    Insurance value of intelligent well technology against reservoir uncertainty

    , SPE/DOE Improved Oil Recovery Symposium
  • Journal article
    Stafford PJ, Strasser FO, Bommer JJ, 2008,

    An evaluation of the applicability of the NGA models to ground-motion prediction in the Euro-Mediterranean region

    , Bulletin of Earthquake Engineering, Vol: 6, Pages: 149-177, ISSN: 1570-761X

    The first phase of the Next Generation Attenuation (NGA) project has now finished, resulting in the publication of five new sets of empirical ground-motion models for PGA, PGV and response spectral ordinates. These models mark a significant advancement in the state-of-the-art in empirical ground-motion modelling and include many effects that are not accounted for in existing European equations. Under the assumption that the Euro-Mediterranean database from which the European relationships are derived is unlikely to drastically change in the near future, a prudent question to ask is: can the NGA models be applied in Europe? In order to answer this question, the NGA model of Boore and Atkinson (PEER Report 2007/01, Pacific Earthquake Engineering Research Center, Berkeley, CA, 234 pp., 2007), which is shown to be representative of the NGA models as a suite, is compared with the dataset used for the development of the most recent European empirical ground-motion models for response spectral ordinates and peak ground velocity. The comparisons are made using analyses of model residuals and the likelihood approach of Scherbaum et al. (Bull Seism Soc Am 94(6):2164–2185, 2004). The analyses indicate that for most engineering applications, and particularly for displacement-based approaches to seismic design, the NGA models may confidently be applied within Europe. Furthermore, it is recommended that they be used in conjunction with existing European models to provide constraint on finite-fault effects and non-linear site response within logic-tree frameworks. The findings also point to the potential benefits of merging the NGA and European datasets.

  • Conference paper
    Strasser FO, Stafford PJ, Bommer JJ, Erdik Met al., 2008,

    State-of-the-art of European earthquake loss estimation software

    , 14th World Conference on Earthquake Engineering
  • Journal article
    Rushmer T, Jackson MD, 2008,

    Impact of melt segregation on tonalite–trondhjemite–granodiorite (TTG) petrogenesis

    , Trans. Royal Society of Edinburgh: Earth Science, Vol: 79, Pages: 325-336
  • Journal article
    Hancock J, Bommer JJ, Stafford PJ, 2008,

    Numbers of scaled and matched accelerograms required for inelastic dynamic analyses

    , Earthquake Engineering and Structural Dynamics, Vol: 37, Pages: 1585-1607, ISSN: 0098-8847
  • Conference paper
    Kontoe S, Zdravkovic L, Potts DM, 2008,

    The importance of revised modulus decay curves on surface foundation settlement predictions in London Clay

    , BGA International Conference on Foundations, Pages: 1549-1558
  • Journal article
    Stafford PJ, Mendis R, Bommer JJ, 2008,

    The dependence of damping correction factors for response spectra on duration and numbers of cycles

    , Journal of Structural Engineering - ASCE, Vol: 134, Pages: 1364-1373, ISSN: 0733-9445
  • Conference paper
    Bell RE, 2008,

    Seismic reflection character of the Hikurangi subduction interface, New Zealand, in the region of repeated Gisborne slow slip events

    , AGU Fall Meeting
  • Journal article
    Attal M, Tucker GE, Whittaker AC, Cowie PA, Roberts GPet al., 2008,

    Modelling fluvial incision and transient landscape evolution: influence of dynamic channel adjustment

    , JOURNAL OF GEOPHYSICAL RESEARCH, Vol: 113
  • Conference paper
    Taborda D, Zdravkovic L, Kontoe S, Potts DMet al., 2008,

    Comparative study of cyclic nonlinear elastic models in dynamic finite element analysis

    , Coimbra, Portugal, XI National Conference on Geotechnics, Pages: 147-154
  • Journal article
    Cowie PA, Whittaker AC, Attal M, Tucker GE, Roberts GP, Ganas Aet al., 2008,

    New constraints on sediment-flux dependent river incision: Implications for extracting tectonic signals from river profiles.

    , Geology, Vol: 36, Pages: 535-538, ISSN: 0091-7613
  • Journal article
    Grammatikopoulou A, Zdravkovic L, Potts DM, 2007,

    The effect of the yield and plastic potential deviatoric surfaces on the failure height of an embankment

    , GEOTECHNIQUE, Vol: 57, Pages: 795-806, ISSN: 0016-8505
  • Journal article
    Whittaker AC, Cowie PA, Attal M, Tucker GE, Roberts GPet al., 2007,

    Contrasting transient and steady-state rivers crossing active normal faults: new field observations from the Central Apennines, Italy

    , BASIN RESEARCH, Vol: 19, Pages: 529-556, ISSN: 0950-091X

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