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Quantitative interpretation of time‐lapse seismic data at Farnsworth field unit: Rock physics modeling, and calibration of simulated time‐lapse velocity responses

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  • Samuel Appiah Acheampong
  • William Ampomah
  • Hassan Khaniani
  • Robert Will
  • Justice Sarkodie‐Kyeremeh

Abstract

This study investigates the contribution of fluid saturation variation to the time‐lapse velocity response by performing fluid substitution modeling. The methodology is exemplified by the time‐lapse seismic monitoring of carbon dioxide at Farnsworth field unit (FWU). In order to evaluate the fluid distribution in a matured oil reservoir, the Southwest Regional Partnership (SWP) acquired multiple vertical seismic profile (VSP) surveys at different times during the CO2–water alternatinggas (WAG) injection period. In this work, we present a thorough methodology for computing the elastic response of the saturated rock for different fluid saturations using a site‐specific petro‐elastic model (PEM). The output from the PEM was combined with results from a fluid compositional model to compute the seismic velocities at times corresponding to each VSP survey. To produce a calibrated simulated response, the measured time‐lapse seismic velocities were integrated into the numerical simulation model. The mismatches between the predicted and measured time‐lapse velocities were minimized through an iterative calibration process using a trained artificial neural network proxy (ANN) coupled with a particle swarm optimizer (PSO). Our study indicates that the hybrid optimization workflow can effectively perform the history matching. With an accurate prediction of the hydrodynamic properties, the migration of CO2 within the subsurface was modeled by predicting the spatial velocity distribution for a radius of 305 m around the injection well. The technology demonstrated and the expertise gained from this study can guide similar CO2‐WAG projects. © 2022 Society of Chemical Industry and John Wiley & Sons, Ltd.

Suggested Citation

  • Samuel Appiah Acheampong & William Ampomah & Hassan Khaniani & Robert Will & Justice Sarkodie‐Kyeremeh, 2022. "Quantitative interpretation of time‐lapse seismic data at Farnsworth field unit: Rock physics modeling, and calibration of simulated time‐lapse velocity responses," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 12(6), pages 671-697, December.
  • Handle: RePEc:wly:greenh:v:12:y:2022:i:6:p:671-697
    DOI: 10.1002/ghg.2184
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    References listed on IDEAS

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    1. Martha Cather & Dylan Rose-Coss & Sara Gallagher & Natasha Trujillo & Steven Cather & Robert Spencer Hollingworth & Peter Mozley & Ryan J. Leary, 2021. "Deposition, Diagenesis, and Sequence Stratigraphy of the Pennsylvanian Morrowan and Atokan Intervals at Farnsworth Unit," Energies, MDPI, vol. 14(4), pages 1-26, February.
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