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Determination of Reservoir Geomechanical Properties from Acoustic Waves

Shakouri, Ali | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48725 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Masihi, Mohsen; Ghazanfari, Mohmmad Hossein
  7. Abstract:
  8. One of the most common methods for determining elastic moduli of rocks and porosity is acoustic velocity log. The elastic moduli of reservoir rock are widely used in geomechanical modelling, borehole stability and hydraulic fracture design. Carbonate oil reservoirs are known for heterogeneity and anisotropic nature. Therefore correlation of acoustic velocity and rock properties are generally challenging. Rock’s shear modulus is very important during saturating of sample with pore fluid because assumed it is independent of pore fluid type. However due to the several fluid-solid interaction mechanisms such as velocity dispersion, surface energy reduction and viscous coupling, shear modulus (precisely shear velocity) changes after pore fluid substitution. In this study a set up repaired to measure sonic velocity under triaxial condition on both wet and dry condition. In our experiment we measured acoustic velocities of 16 carbonate samples with a wide range of porosity and permeability from different oil reservoirs under different confining and axial pressures. Our results shows that wettability plays an important role in acoustic velocities specially in tight pores as shear velocity in water wet samples saturated with brine and dead oil results in reduction and increase in shear velocity, vice versa. All of our samples showed increase in compressional velocity after saturation. Also axial pressure, confining pressure and pore pressure applied that results in reduction in acoustic velocity difference between dry and wet condition
  9. Keywords:
  10. Elastisity Modulus ; Wettability ; Carbonate Resrevoirs ; Sound Waves ; Triaxial Test ; Geomechanical Process

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