Schiehallion: A 3‐D time ‐ lapse processing case history

Altan, Suat; Zhu, Xiaowei; Walker, C. K.; Dillon, Gary; Brzostowski, Matthew A.

doi:10.1190/1.1820839

Cited by 1 publication

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4D effects have been clearly documented at Schiehallion during the seismic survey period 1993-1999, despite its short one-year production history (Altan et al 1999). Time-lapse changes in the continuity of reflectors and in the character of connectivity boundaries were found, along with seismic amplitude changes around water injectors and producing wells.…”

mentioning

confidence: 93%

See 1 more Smart Citation

Rock physics analysis for time‐lapse seismic at Schiehallion Field, North Sea

Meadows¹,

Adams²,

Wright

et al. 2005

Geophysical Prospecting

View full text Add to dashboard Cite

A B S T R A C TRock physics analysis plays a vital role in time-lapse seismic interpretation because it provides the link between changes in rock and fluid properties and the resulting seismic data response. In this case study of the Schiehallion Field, we discuss a number of issues that commonly arise in rock physics analyses for time-lapse studies. We show that: 1 Logarithmic fits of dry bulk (K dry ) and shear (G dry ) moduli vs. effective pressure (P eff ) are superior to polynomial fits. 2 2D surface fits of K dry and G dry over porosity (φ) and effective pressure using all the core data simultaneously are more useful and accurate than separate 1D fits over φ and P eff for each individual core. 3 One average set (facies) of K dry (φ, P eff ) and G dry (φ, P eff ) can be chosen to represent adequately the entire Schiehallion reservoir. 4 Saturated velocities and densities modelled by fluid substitution of K dry (φ, P eff ), G dry (φ, P eff ) and the dry bulk density ρ dry (φ) compare favourably with well-log velocities and densities. 5 P-and S-wave impedance values resulting from fluid substitution of K dry (φ, P eff ), G dry (φ, P eff ) and ρ dry (φ) show that the largest impedance changes occur for high porosities and low effective pressures. 6 Uncertainties in K dry (φ, P eff ) and G dry (φ, P eff ) derived for individual cores can be used to generate error surfaces for these moduli that represent bounds for quantifying uncertainties in seismic modelling or pressure-saturation inversion.

show abstract

mentioning

confidence: 93%

“…4D effects have been clearly documented at Schiehallion during the seismic survey period 1993–1999, despite its short one‐year production history (Altan et al . 1999).…”

Section: Introductionmentioning

confidence: 99%