FLUID SENSITIVITY OF ROCK PHYSICS PARAMETERS IN RESERVOIRS: QUANTITATIVE ANALYSIS

摘要

Pore fluid is an important factor affecting on reservoir properties. Generally, variations of elastic parameters reflect the changes of hydrocarbon saturation in rocks, which are meaningful for seismic identification of reservoir hydrocarbons. In this study, distribution features of the measured data are analyzed on the rock property crossplots, based on the relative variations of rock physics parameters between different fluid-saturation states, so that an evaluation methodology of effective fluid sensitivity indicator (EFSI) is presented to quantitatively analyze the influence of pore fluids on rock parameters. It is applied on the thirteen typical rock physics parameters based on the measured data from the carbonates of China. On the crossplots of the selected rock physics parameters with high EFSI values, reservoir rocks containing different types of fluid can be effectively discriminated.