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dc.contributor.advisorWood, Rachel
dc.contributor.advisorCurtis, Andrew
dc.contributor.advisorvan Dijke, Rink
dc.contributor.authorHarland, Sophie Rebekah
dc.date.accessioned2018-01-15T11:09:17Z
dc.date.available2018-01-15T11:09:17Z
dc.date.issued2016-06-27
dc.identifier.urihttp://hdl.handle.net/1842/25961
dc.description.abstractMicropores can constitute up to 100% of the total porosity within carbonate hosted hydrocarbon reservoirs, usually existing within micritic fabrics. There is, however, only a rudimentary understanding of the contribution that these pores make to reservoir performance and hydrocarbon recovery. To further our understanding, a flexible, object-based algorithm has been developed to produce 3D computational representations of end-point micritic fabrics. By methodically altering model parameters, the state-space of microporous carbonates is explored. Flow properties are quantified using lattice-Boltzmann and network modelling methods. In purely micritic fabrics, it has been observed that average pore radius has a positive correlation with single-phase permeability and results in decreasing residual oil saturations under both water-wet and 50% fractionally oil-wet states. Similarly, permeability increases by an order of magnitude (from 0.6md to 7.5md) within fabrics of varying total matrix porosity (from 18% to 35%) due to increasing pore size, but this has minimal effect on multi-phase flow. Increased pore size due to micrite rounding notably increases permeability in comparison to original rhombic fabrics with the same porosity, but again, multi-phase flow properties are unaffected. The wetting state of these fabrics, however, can strongly influence multi-phase flow; residual oil saturations vary from 30% for a water-wet state and up to 50% for an 80% oil wet fraction. flow when directly connected. Otherwise, micropores control single-phase permeability magnitude. Importantly in these fabrics, recovery is dependent on both wetting scenario and pore-network homogeneity; under water-wet imbibition, increasing proportions of microporosity yield lower residual oil saturations. Finally, in grain-based fabrics where mesopores form an independently connected pore network, micropores do not affect permeability, even when they constitute up to 50% of the total porosity. Through examination of these three styles of microporous carbonates, it is apparent that micropores can have a significant impact on flow and sweep characteristics in such fabrics.en
dc.contributor.sponsorotheren
dc.language.isoenen
dc.publisherThe University of Edinburghen
dc.relation.hasversionKallel, W., van Dijke, M., Sorbie, K., Jiang, Z., Wood, R. & Harland, S. (2014). Modelling wettability alteration in microporous carbonate rocks. In: AAPG Annual Conference, Houston, Texas, Abstract Number 41428.en
dc.subjectmicroporeen
dc.subjectcarbonateen
dc.subjectreservoiren
dc.subjectfluid flowen
dc.subjectwettabilityen
dc.titleQuantifying the role of microporosity in fluid flow within carbonate reservoirsen
dc.typeThesis or Dissertationen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePhD Doctor of Philosophyen
dc.rights.embargodate2100-12-31en
dcterms.accessRightsRestricted Accessen


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