reservoir characterization

Aug 14th, 2016
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Reservoir System and CharacterizationI.Overviewa. Reservoir subsurface rock and sediment materials characterized by porosity and permeability,to allow the migration and accumulation of petroleum hydrocarbonsa.Reservoir: porous rock/sediment units that have a capacity to contain water,pores can be formed by openings between grains (primary porosity) or by cracksand fractures in the rocks (secondary porosity)(1)b.Common Reservoirs:(a)Unconsolidated / Semi-lithified Sands(b)Sandstone(c)Carbonates (Limestone and Dolostone)Seal: Impermeable layers which will not transmit or store groundwater, tend toform the upper or lower boundaries of aquifers1. Common Sealsa. Unconsolidated / Semi-lithified Muds (silt and clay)b. Shalec. Well cemented / recrystallized sandstoneII.Porosity2.Porosity: ratio, in per cent, of the volume of void space to the total volume of sedimentor rockn (%) = total volume - volume of solids x 100%total volumea.Porosity is the primary governing factor influencing the ability of rock or sedimentto store fluids (e.g. groundwater or hydrocarbons)b.Types of Porous Openings(a)Intergranular Porosity = primary pore spaces present betweenparticles of a sediment or rock depositi)Intergranular Porosity influenced by:a)sortingb)grain packingc)grain size(b)Fractured Porosity(c)Solution Cavities(d)Vesiclesc.Effective porosity: considers the extent to which pore spaces are interconnectedin a deposit, a

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