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Impact of Effective Pressure on Acoustic Impedance-Velocity Linear Relationships: Ordovician Red River ‘C’ Zone Reservoir, Williston Basin, USA
- Source: First Break, Volume 42, Issue 3, Mar 2024, p. 93 - 99
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- 01 Mar 2024
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Abstract
P-wave and S-wave impedance are linearly related with their respective velocities at both low and high levels of effective pressure. The study was carried out at the core scale and brine-saturated state of carbonate core samples with variable porosities. The slopes, derived from linear-linear crossplots of P-wave and S-wave impedance versus their respective velocities, exhibit close quantitative agreement from one level of effective pressure to another. The intercept values are all negative and exhibit significant increase, going from low to high effective pressures. For practical purposes, the impedance-velocity relationships are both rock-typing and porosity-discriminating criteria. The high correlation coefficient exhibited in the crossplots at all levels of differential pressure signifies that the relationships could potentially be used to investigate carbonate reservoirs at different depths and rock competencies. The large differential between intercept values for P-waves and S-waves could be a diagnostic tool for discriminating carbonate reservoirs. These results show that the impedance-velocity linear relationships for P-wave and S-wave could become important tools for predictive and quantitative reservoir characterisation in well logs and seismic data.