1-1_Rock_Props_Poro_Perm

1-1_Rock_Props_Poro_Perm - Week Major Subject Topics...

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Unformatted text preview: Week Major Subject Topics Covered 1 Rock Properties Porosity; Permeability; Compressibility; Darcy's Law 2-3 Reservoir Fluid Properties Density; Pressure; Composition; Phase Relationships; Equations of State; Formation Volume Factors 4-6 Multiphase Fluid Flow Relative Permeability; Capillary Forces; Multiphase Flow Laws; Immiscible Displacement; Diffuse (Fractional) Flow; Segregated Flow 7-9 Reservoir Evaluation Types of Reservoir / Drive Mechanisms; Volumetrics; Material Balance; Decline Curves; Well Test Analysis 10-11 Reservoir Simulation Principles of Modelling; Boundary Conditions; Assigning Properties; IMEX 12 Enhanced Recovery (Water Flooding); Polymer Flooding; Miscible Flooding; Thermal Recovery Formation damage Porosity How much solid/ how much void Permeability - Darcy's Law How fast fluid flows in rock Compressibility How rock deforms with pressure change Module 1: Rock Properties Porosity Definition Different types Controls on porosity Measurement Pores Porosity Direction of fluid flow Non-interconnected Pore spaces Dead-end pores Rocks are comprised of grains (matrix) with void spaces in between. Porosity ( n or ) = (fraction) Effective porosity: Void ratio: bulk void V V bulk cted interconne eff V V = - = = 1 e solid void V V Porosity (%) Void Ratio (%) 5 5.26 10 11.1 15 17.6 20 25.0 25 33.3 30 42.9 35 53.9 40 66.7 45 81.8 50 100 POROSITY TYPES Primary porosity is original interstitial or inter-granular void space. Secondary porosity is void space developed by fractures or dissolution. Effective porosity is the volume of inter-connected voids per unit volume. Dual porosity refers to a rock in which the void space is made up of components with different origins. For example, inter-granular and fracture; fracture and (dis)solution; etc Pore Size Frequency Plots Single Dual Pore Size Frequency Pore Size Frequency Example of Dual Porosity Rock: Fractured Limestone Example of Dual Porosity Rock: Vuggy Limestone Core slab with secondary vugs (arrows) resulting from the partial dissolution of earlier dolomite cement (white). Example of Dual Porosity Rock: Vuggy Limestone CONTROLS ON POROSITY Packing- how grains or clasts are packed together. Sorting- particle size distribution. Clast porosity- porosity within clasts or fragments. Fracturing porosity- secondary porosity added by stress and deformation. Solution porosity- secondary porosity added by solid-fluid interaction. Primary porosity is often destroyed. Geological processes (e.g., cementation, compression/extension, consolidation, burial), continuously change effective reservoir porosity through time. The origin of porosity is often complex. Geological history determines porosity. r Cube of volume 8r 3 Each grain contributes 1/8 th of its volume to the solid mass within the cube Porosity Structure and packing affected by quantity and distribution of fine grains, degree of cementation and also packing of grains Packing Packing of uniform size, spherical grains...
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This note was uploaded on 08/31/2011 for the course PGE 301 taught by Professor Olson during the Spring '11 term at University of Texas at Austin.

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1-1_Rock_Props_Poro_Perm - Week Major Subject Topics...

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