Time-Lapse Gravity for Reservoir Monitoring: Feasibility and Potential Applications

Richard Krahenbuhl; Yaoguo Li; Tom Davis

doi:10.1071/ASEG2012ab191

ISSN: 2202-0586
E-ISSN:

oa Time-Lapse Gravity for Reservoir Monitoring: Feasibility and Potential Applications
Authors Richard Krahenbuhl^a, Yaoguo Li^b and Tom Davis^c
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^a Colorado School of Mines (CGEM), 1500 Illinois St., Golden, CO 80401, United States, [email protected] ^b Colorado School of Mines (CGEM), 1500 Illinois St., Golden, CO 80401, United States, [email protected] ^c Colorado School of Mines (RCP), 1500 Illinois St., Golden, CO 80401, United States, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2012, Issue ASEG2012 - 22nd Geophysical Conference, Dec 2012, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2012ab191
- Published online: 01 Dec 2012

Abstract

Summary

We demonstrate a robust workflow for time-lapse gravity modeling in reservoir sequestration/production monitoring applications. This systematic approach outlines a reliable methodology to understanding the value and limitations of 4D gravity at a particular site, for both pre-acquisition decision making, and as a guide for post-data acquisition interpretation. To demonstrate, we present a multi-faceted feasibility study for monitoring CO2 injection into a reservoir at various injection times using 4D micro-gravity method. The simulations are performed for a currently active CO2-EOR site, the Louisiana Delhi Field in the United State. We construct an accurate representation of the field directly from current seismic data, followed by application of binary inversion technology adapted to the time-lapse gravity problem and tailored to the specific site. Finally, we illustrate a method of resolution analysis to demonstrate the decreased recoverability of fluid movement at the site in the presence of varying data noise.

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2012-12-01

2026-01-23

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References

Bloomer, P.A. Jr., 1946, Subsurface study of the Delhi area Franklin and Richland Parishes Louisiana: State of Louisiana Department of Conservation, Geological Pamphlet No.4.
Davis, K., Kass, M.A., Krahenbuhl, R.A., and Li, Y., 2008, Survey design and model appraisal based on resolution analysis for 4D gravity monitoring: 78th Annual International Meeting, SEG, Expanded Abstracts, 731 – 735.
Ferguson, J.F., T. Chen, J. Brady, C.L.V. Aiken, and J. Seibert, 2007, The 4D mocrogravity method for water flood surveillance II – Gravity measurements for the Prudhoe Bay reservoir, Alaska: Geophysics, 72, I33 – I43.
Hare, J.L., Ferguson, J.F., and Brady, L., 2008, The 4D microgravity method for waterflood surveillance: Part IV – Modeling and interpretation of early epoch 4D gravity surveys at Prudhoe Bay, Alaska: Geophysics, 73, 6, WA173-WA180.
Kirkendall, B., 2007, Nonlinear model appraisal in gravity gradiometry imaging; properties and modeling of the resolution matrix: Ph.D. thesis, Colorado School of Mines.
Krahenbuhl, R. A., and Y. Li, 2008, Joint inversion of surface and borehole 4D gravity data for continuous characterization of fluid contact movement: 78th Annual International Meeting, SEG, Expanded Abstracts.
-----2009, Hybrid optimization for lithologic inversion and time-lapse monitoring using a binary formulation: Geophysics, 74, I55– I65.
Reid, A. B., 1980, Aeromagnetic survey design: Geophysics, 45, 973 – 976

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Article Type: Research Article

Keyword(s): Feasibility Study; Gravity; Inversion; Reservoir Monitoring; Time-Lapse

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