Petrophysics by Ekwere J. Peters PhD PE

By Ekwere J. Peters PhD PE

The collage of Texas approach Board of Regents licensed Dr. Ekwere J. Peters as a professor emeritus. within the 85-year heritage of UT PGE purely 5 different professors have acquired the distinguished identify: Folkert Brons, Sylvain Pirson, Harry H. strength, Ben H. Caudle and Robert (Bob) Schechter. Peters retired in 2011 after 30 years of accomplishing leading edge learn and perfect educating at UT PGE, leaving his mark on generations of engineers.

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Two types of fluid displacements can be used to determine bulk volume. In the first method, fluid that does not easily penetrate the pores such as mercury is used. 5a). Since mercury does not penetrate the pores at atmospheric pressure, the volume of mercury displaced is equal to the bulk volume of the sample. In the second method, fluid which easily saturates the sample is used. The sample is weighed in air, evacuated and then saturated with a liquid (brine, kerosene, or toluene). The saturated sample is weighed in air and then weighed fully immersed in the saturating liquid.

Frequently, the results of core analysis are used to calibrate well logs. 1 An experiment has been performed to determine the porosity of an irregularly shaped core sample. The cleaned dry sample was weighed in air. 85 gm/cc and then weighed again in air. Afterwards, the saturated sample was weighed when it was fully immersed in the oil. Here are the results of the experiment. 80 gm a. Calculate the porosity of the core. 2-11 b. Is there enough information from this experiment to determine the mineralogy of the sample?

This replacement causes a shrinkage of 12 to 13% in the grain volume, with a corresponding increase in secondary porosity. 4 TYPICAL RESERVOIR POROSITY VALUES Sandstones have porosities that typically range from 8% to 38%, with an average of 18%. About 95% of sandstone porosity is effective porosity. Sandstone porosity is usually mostly intergranular porosity. Carbonates have porosities that typically range from 3% to 15%, with an average of about 8%. porosity. About 90% of carbonate porosity is effective Carbonate porosities are much more difficult to characterize and may consist of (1) intergranular, (2) intercrystalline, (3) fractures and fissures, and (4) vugular porosities.

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