4-D constrained depth conversion for reservoir compaction estimation: Application to Ekofisk Field

Guilbot, J.; Smith, Brackin A.

doi:10.1190/1.1463782

Cited by 104 publications

(65 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Such deformation has been observed in both geodetic data (Castle et al 1969, Evans et al 1982, Dussealt et al 1993, Bruno and Bilak 1994, Chilingarian et al 1994, Castillo et al 1997, Fielding et al 1998, Wright 1998, Mossop and Segall 1999, Du and Olson 2001, Stancliffe and van der Kooij 2001, Vasco et al 2002, Du et al 2005, Vasco and Ferretti 2005 and time-lapse seismic surveys (Guilbot and Smith 2002, Hatchell and Burne 2005, Hawkins et al 2007, Staples et al 2007). Furthermore, current and planned instrumentation, such as permanent sea floor sensors and high precision pressure gauges (Sasagawa et al 2003) can generate useful displacement measurements.…”

Section: Discussionmentioning

confidence: 99%

“…InSAR observations may be used to image fluid-induced deformation over regions tens to hundreds of square kilometers in extent (Fielding et al 1998, Galloway et al 1998, Amelung et al 1999, Hoffmann et al 2001, Schmidt and Burgmann 2003, Colesanti et al 2003, Vasco and Ferretti 2005. Second, recent developments in the processing of time-lapse seismic data allow for estimates of deformation in the overburden and within the reservoir (Guilbot and Smith 2002, Landro and Stammeijer 2004, Tura et al 2005, Hatchell and Bourne 2005, Barkved and Kristiansen 2005, Hall 2006, Roste et al 2006, Staples et al 2007, Hawkins et al 2007). Such estimates offer high resolution, three-dimensional sampling of deformation over a producing reservoir.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Estimating permeability from quasi-static deformation: Temporal variations and arrival-time inversion

2008

View full text Add to dashboard Cite

Transient pressure variations within a reservoir can be treated as a propagating front and analyzed using an asymptotic formulation. From this perspective one can define a pressure 'arrival time' and formulate solutions along trajectories, in the manner of ray theory. We combine this methodology and a technique for mapping overburden deformation into reservoir volume change as a means to estimate reservoir flow properties, such as permeability. Given the entire 'travel time' or phase field, obtained from the deformation data, we can construct the trajectories directly, there-by linearizing the inverse problem. A numerical study indicates that, using this approach, we can infer large-scale variations in flow properties. In an application to Interferometric Synthetic Aperture (InSAR) observations associated with a CO 2 injection at the Krechba field, Algeria, we image pressure propagation to the northwest. An inversion for flow properties indicates a linear trend of high permeability.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Estimating permeability from quasi-static deformation: Temporal variations and arrival-time inversion

2008

View full text Add to dashboard Cite

show abstract

“…1988, Dussealt et al 1993, Bruno and Bilak 1994, Castillo et al 1997, Massonnet et al 1997, Fielding et al 1998, Mossop and Segall 1999, Vasco et al 2000a, Stancliffe and van der Kooij 2001, Schmidt and Burgmann 2003, Vasco and Ferretti 2005 or by timelapse seismic monitoring (Guilbot and Smith 2002, Landro and Stammeijer 2004, Tura et al 2005, Hall 2006, Roste et al 2006, Rickett et al 2007, Staples et al 2007 to constrain volume and fluid pressure changes within a reservoir. Our analysis assumes that a set of deformation measurements have been gathered.…”

Section: Estimating Volume and Pressure Changes Within The Reservoirmentioning

confidence: 99%

“…These studies utilized geodetic data, such as leveling measurements, in order to quantify surface deformation related to fluid production or injection. Currently, time-lapse seismic surveys are providing additional deformation measurements, distributed throughout the overburden (Guilbot and Smith 2002, Landro and Stammeijer 2004, Tura et al 2005, Hatchell and Bourne 2005, Barkved and Kristiansen 2005, Hall 2006, Roste et al 2006, Rickett et al 2007, Staples et al 2007). Recently, the observed deformation has been used to better understand fluid flow and the heterogeneity of flow properties within the reservoir (Vasco et al 2000a, Vasco et al 2001, Du et al 2005, Vasco and Ferretti 2005, Hodgson et al 2007, Vasco et al 2008.…”

Section: Introductionmentioning

confidence: 99%

Reservoir monitoring and characterization using satellite geodetic data: Interferometric synthetic aperture radar observations from the Krechba field, Algeria

2008

View full text Add to dashboard Cite

Deformation in the material overlying an active reservoir is used to monitor pressure change at depth. A sequence of pressure field estimates, eleven in all, allow us to construct a measure of diffusive travel time throughout the reservoir. The dense distribution of travel time values means that we can construct an exactly linear inverse problem for reservoir flow properties. Application to Interferometric Synthetic Aperture Radar (In-SAR) data gathered over a CO 2 injection in Algeria reveals pressure propagation along two northwest trending corridors. An inversion of the travel times indicates the existence of two northwest-trending high permeability zones. The high permeability features trend in the same direction as the regional fault and fracture zones. Model parameter resolution estimates indicate that the features are well resolved.

show abstract

“…pressure inside a producing reservoir has been observed in a number of reservoirs in the Gulf of Mexico and North Sea, particularly in the high-porosity, over-pressured (HPHT) sand and chalk reservoirs with large thickness (e.g., Guilbot and Smith 2002;Hawkins et al 2007;Herwanger and Horne 2009). …”

mentioning

confidence: 99%

Analysis of time-lapse travel-time and amplitude changes to assess reservoir compartmentalization

Angus

Clark

et al. 2015

Geophysical Prospecting

View full text Add to dashboard Cite

Fluid depletion within a compacting reservoir can lead to significant stress and strain changes and potentially severe geomechanical issues, both inside and outside the reservoir. We extend previous research of time-lapse seismic interpretation by incorporating synthetic near-offset and full-offset common-midpoint reflection data using anisotropic ray tracing to investigate uncertainties in timelapse seismic observations. The time-lapse seismic simulations use dynamic elasticity models built from hydro-geomechanical simulation output and a stress-dependent rock physics model. The reservoir model is a conceptual two-fault graben reservoir, where we allow the fault fluid-flow transmissibility to vary from high to low to simulate non-compartmentalized and compartmentalized reservoirs respectively. The results indicate time-lapse seismic amplitude changes and traveltime shifts can be used to qualitatively identify reservoir compartmentalization. Due to the high repeatability and good quality of the time-lapse synthetic dataset, the estimated traveltime shifts and amplitude changes for near-offset data match the true model subsurface changes with minimal errors. A 1D velocity-strain relation was used to estimate the vertical velocity change for the reservoir bottom interface by applying zero-offset time-shifts from both the near-offset and full-offset measurements.For near-offset data, the estimated P-wave velocity changes were within 10% of the true value.However, for full-offset data, time-lapse attributes are quantitatively reliable using standard time-lapse seismic methods when an updated velocity model is used rather than the baseline model.

show abstract

4-D constrained depth conversion for reservoir compaction estimation: Application to Ekofisk Field

Cited by 104 publications

References 0 publications

Estimating permeability from quasi-static deformation: Temporal variations and arrival-time inversion

Estimating permeability from quasi-static deformation: Temporal variations and arrival-time inversion

Reservoir monitoring and characterization using satellite geodetic data: Interferometric synthetic aperture radar observations from the Krechba field, Algeria

Analysis of time-lapse travel-time and amplitude changes to assess reservoir compartmentalization

Contact Info

Product

Resources

About