Integrated Time-Lapse Rock Physics Measurements – the Key to Understanding Reservoir Elastic Moduli Changes with Hydrocarbon Production

Guerra, R.; Meyer, J. H.; Sibbit, Alan; Delden, R. Van

doi:10.3997/2214-4609-pdb.19.a02

Cited by 2 publications

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“…As pointed out in Ref. 33, this is valid for well-cemented and consolidated rocks, but in loose unconsolidated sands the compaction is both anelastic and irreversible. Figure 3͑a͒ shows the compressibilities C bc , C bw , and C bca versus effective pressure, normalized by C s .…”

Section: B Bulk Compressibilities Versus Saturation and Pressurementioning

confidence: 68%

“…Consequently, these results should be compared to appropriate laboratory experiments or field data. Moreover, since unconsolidated reservoir sandstones are expected to show large sensitivity to fluid type and effective pressure, 33 a similar theoretical and applied analysis should be performed for such cases. Finally, a rock in the subsurface is subjected to a nonhydrostatic state of stress: in general, the vertical stress is greater than the horizontal stress, and this situation induces P-and S-wave anisotropy in an otherwise isotropic rock.…”

Section: Conclusion Remarks and Future Workmentioning

confidence: 99%

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Acoustic and mechanical response of reservoir rocks under variable saturation and effective pressure

Ravazzoli

Santos

Carcione

2003

The Journal of the Acoustical Society of America

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We investigate the acoustic and mechanical properties of a reservoir sandstone saturated by two immiscible hydrocarbon fluids, under different saturations and pressure conditions. The modeling of static and dynamic deformation processes in porous rocks saturated by immiscible fluids depends on many parameters such as, for instance, porosity, permeability, pore fluid, fluid saturation, fluid pressures, capillary pressure, and effective stress. We use a formulation based on an extension of Biot's theory, which allows us to compute the coefficients of the stress-strain relations and the equations of motion in terms of the properties of the single phases at the in situ conditions. The dry-rock moduli are obtained from laboratory measurements for variable confining pressures. We obtain the bulk compressibilities, the effective pressure, and the ultrasonic phase velocities and quality factors for different saturations and pore-fluid pressures ranging from normal to abnormally high values. The objective is to relate the seismic and ultrasonic velocity and attenuation to the microstructural properties and pressure conditions of the reservoir. The problem has an application in the field of seismic exploration for predicting pore-fluid pressures and saturation regimes.

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Section: B Bulk Compressibilities Versus Saturation and Pressurementioning

confidence: 68%

Section: Conclusion Remarks and Future Workmentioning

confidence: 99%