What question did this study set out to answer?

To evaluate how rock bulk compressibility, pore geometry, and fluid saturation affect acoustic wave velocity during sonic log interpretation.

December 1, 1961Society of Petroleum Engineers JournalOpen Access

Velocity-Log Interpretation: The Effect of Rock Bulk Compressibility

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Authors

JGJ. GeertsmaShell (United Kingdom)

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Implication

Theoretical analysis reveals how rock compressibility and pore fluid alter acoustic wave velocities in porous formations, indicating limitations in traditional time-average equations.

Key Points

To evaluate how rock bulk compressibility, pore geometry, and fluid saturation affect acoustic wave velocity during sonic log interpretation.
Applied Biot's continuum theory to analyze acoustic wave propagation differences between dry and liquid-saturated porous rock media.
Evaluated reciprocal acoustic velocity relationships against porosity across sandstones and complex carbonate rocks using sonic logging and ultrasonic data.
Demonstrated that dry sandstones display a nearly linear relationship between reciprocal velocity and porosity (1/V ~ A + B ø), with liquid saturation shifting coefficient B consistent with Biot's theory.
Showed that while the conventional time-average equation lacks a sound physical basis, it empirically approximates parameters A and B in select formations.
Identified substantial interpretation challenges in carbonate rocks due to complex pore structures, mixed mineral composition (calcite, dolomite, and anhydrite), natural fractures, and shale streaks.

Cite This Study

J. Geertsma (1961) studied this question.

synapsesocial.com/papers/6a7a0732b9dd6cc1fe0db0d7 https://doi.org/10.2118/1535-g

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Implication

Theoretical analysis reveals how rock compressibility and pore fluid alter acoustic wave velocities in porous formations, indicating limitations in traditional time-average equations.

Velocity-Log Interpretation: The Effect of Rock Bulk Compressibility

Discussion

Member takes

Implication

Key Points

Cite This Study

Velocity-Log Interpretation: The Effect of Rock Bulk Compressibility

Discussion

Member takes

Implication

Key Points

Cite This Study

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