15 research outputs found
Experimental study and a proposed new approach for thermodynamic modeling of wax precipitation in crude oil using a PC-SAFT model
Calculation of the Thermodynamic Equilibrium of a Multicomponent Two-Phase System Based on Minimization of the Gibbs Potential
An improved component retrieval method for cubic equations of state with non-zero binary interaction coefficients for natural oil and gas
A modified rock physics model for analysis of seismic signatures of low gas-saturated rocks
A novel three pseudo-component approach (ThPCA) for thermodynamic description of hydrocarbon-water systems
Determination of limit of stability profiles for liquefied natural gas: a thermodynamic approach
On seismic monitoring of CO 2 leakage from geological storages and its primary detection
Discrimination of fizz water and gas reservoir by AVO analysis: a modified approach
Amplitude versus offset response is analogous to variation in P-wave velocity re-
sulting from different pore fluid saturations. However, the input parameters of fluid mixtures
such as fluid modulus and density are often estimated using volume average method, and the
resulting estimates of fluid effects can be overestimated. In seismic frequency band, the vol-
ume average method ignores the heat and mass transfers between the liquid and gas phases,
which are caused by pore pressure perturbations. These effects need to be accounted for the
interpretation of the seismic events and forward modeling of fizz water reservoirs. The con-
ventional model is corrected in present study by considering the thermodynamic properties
of the fluid phases. This corrected model is then successfully applied on a gas producing
field in the North Sea. AVO response, based on the corrected model is highly affected by
pressure related variations in bulk modulus of multi-phase formation fluid. Velocity push
down effect appears, as the free gas saturation generates stronger AVO response than ob-
tained by a conventional AVO model. The, present research reveals that such response is
helpful to discriminate fizz water from commercial gas, to detect primary leakage of gas
(CO
2
or CH
4
) from geological structures and to model free gas effects on seismic attributes