Integrated interpretation of borehole and crosswell data from a west Texas field

Lines, Larry; Miller, M. M.; Tan, Henry; Chambers, Rich; Treitel, Sven

doi:10.1190/1.1436907

Cited by 12 publications

(8 citation statements)

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“…These techniques have important applications in reservoir delineation and monitoring, where the purpose is to resolve the fine detail of structure and lithology between Wells (see e.g. Schaack et al 1992;Lines et al 1993;Zhou et al 1993). Downhole data acquisition with frequencies above 1 kHz is increasingly popular in the industry (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Cased borehole effects on downhole seismic measurements¹

Peng

Cheng

Toksöz

1994

Geophysical Prospecting

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Abst ractBoth approximate and exact formulations for the interaction of an incident elastic wave with a cased borehole are presented. In the approximate method, simple and explicit formulae are derived for the pressure in fluid at low frequencies. In the exact method, elastic potentials in each annulus are represented as a superposition of fundamental solutions to the Helmholtz equations. Continuity of displacements and stresses across layer boundaries are used to determine unknown coefficients. A global matrix algorithm is employed to compute simultaneously these coefficients in individual layers. Calculations show that, in cased boreholes, the borehole effects on downhole seismic measurements are more significant than in Open boreholes. A strong resonance occurs in the fluid for SV-wave incidence from a soft formation. This resonance is prominent even at very high frequencies because the tube-wave velocity is raised well above the formation shear velocity by the Steel pipe. At a particular angle of incidence of a plane P-wave, the pressure in the fluid is near zero at low frequencies (the cased borehole screening phenomenon). For hard formations and frequencies above 1 kHz, the cased borehole influence on a downhole geophone measurement is significant, especially at grazing incidence. For soft formations, both the pressure in the fluid and the solid displacement on the borehole Wall show strong dependence on frequency and angle of incidence, even at low frequencies.

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Section: Introductionmentioning

confidence: 99%

Cased borehole effects on downhole seismic measurements¹

Peng

Cheng

Toksöz

1994

Geophysical Prospecting

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“…Current practices also do not exploit the complementary capabilities of seismic and electrical methods. Seismic methods are best for resolving subsurface structure and porosity (e.g., Lines et al, 1993;Mathisen et al, 1995), whereas electrical methods are preferred for identifying fluids, saturation, and permeability (e.g., Wilt et al, 1995a,b).…”

Section: Introductionmentioning

confidence: 99%

Joint inversion of geophysical data for site characterization and restoration monitoring. FY97 annual progress report for EMSP

Berge¹,

Berryman²,

Bonner³

et al. 1997

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“…The area is close to a 1 acre pilot in which earlier crossborehole seismic surveys were conducted as described in Lines, et al (1993). The 12 acre pilot consists of six injectors and three observation wells.…”

Section: Introductionmentioning

confidence: 99%

Integrated Reservoir Characterization: Beyond Tomography

Lines¹,

Tan²,

Treitel³

et al. 1994

All Days

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In 1992, there was a collaborative effort in reservoir geophysics involving Amoco, Conoco, Schlumberger and Stanford University in an attempt to delineate variations in reservoir properties of the Grayburg unit in a West Texas CO 2 pilot at North Cowden field. Our objective was to go beyond traveltime tomography in characterizing reservoir heterogeneity and flow anisotropy. This effort involved a comprehensive set of measurements to do traveltime tomography, reflector imaging, analysis of channel waves, shear wave splitting for borehole stress estimation, seismic anisotropy, combined with 3D surface seismic and sonic log interpretation. Results are to be validated with cores and engineering data by history matching of primary, water and CO 2 injection performance. The implementation of these procedures should provide critical information on reservoir 229 heterogeneities and preferential flow directions.

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Integrated interpretation of borehole and crosswell data from a west Texas field

Cited by 12 publications

References 0 publications

Cased borehole effects on downhole seismic measurements¹

Cased borehole effects on downhole seismic measurements¹

Joint inversion of geophysical data for site characterization and restoration monitoring. FY97 annual progress report for EMSP

Integrated Reservoir Characterization: Beyond Tomography

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Integrated interpretation of borehole and crosswell data from a west Texas field

Cited by 12 publications

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Cased borehole effects on downhole seismic measurements1

Cased borehole effects on downhole seismic measurements1

Joint inversion of geophysical data for site characterization and restoration monitoring. FY97 annual progress report for EMSP

Integrated Reservoir Characterization: Beyond Tomography

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Cased borehole effects on downhole seismic measurements¹

Cased borehole effects on downhole seismic measurements¹