Physical parameter estimation for sandstone reservoirs
Taiwen Chen, Donald C. Lawton, Fred Peterson
Through theoretical derivation and numerical modeling, this report shows that Biot- Gassman's theory can be used for predicting some physical parameters (e.g., velocity, density, Poisson's ratio, bulk modulus) as functions of porosity or water saturation. Also, it is shown that oil and gas have different Poisson's ratio curve as a function of water saturation. Several plots in this report suggest the importance of obtaining good initial velocity, porosity and dry rock Poisson's ratio estimates when modeling gas-water or oil-water saturated reservoirs.