Applications of boundary-preserving seismic tomography for delineating reservoir boundaries and zones of CO2 saturation

Tieyuan Zhu, Jerry M. Harris

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Delineating reservoir units is still a challenge for seismic approaches. Even high-resolution crosswell tomographic approaches that produce smooth velocity models to match traveltime data usually provide limited information about the boundaries of subsurface targets. A recent development of seismic traveltime tomography incorporated with a boundary-preserving regularization constraint promisingly helps to resolve ambiguities in reservoir boundaries, while allowing lateral variations. We applied a kind of boundarypreserving traveltime tomography to delineate boundaries of the reservoir and CO2-saturated zones.We chose the minimum gradient support as the regularization to preserve boundaries of the geologic target by penalizing smaller model gradients and smoothing small model variations caused by noise. We evaluated several synthetic and real data applications. Synthetic examples demonstrated that the boundary-preserving algorithm produced improved recovery of the profile shape and velocity values of the blocky targets. Two real applications were for delineating the top and base of the reservoir in the King Mountain field, and for delineating a CO2-saturated zone in the McElroy field. These inversion results suggested that the boundarypreserving inversion is able to provide better delineation of the top and base boundaries of the reservoir and boundaries of the CO2-saturated zone than the conventional smooth-constrained inversion.

Original languageEnglish (US)
Pages (from-to)M33-M41
JournalGeophysics
Volume80
Issue number2
DOIs
StatePublished - Jan 1 2015

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seismic tomography
preserving
Tomography
tomography
saturation
phreatic zone
inversions
Recovery
gradients
delineation
smoothing
mountains
ambiguity
recovery
mountain
high resolution
profiles

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology

Cite this

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abstract = "Delineating reservoir units is still a challenge for seismic approaches. Even high-resolution crosswell tomographic approaches that produce smooth velocity models to match traveltime data usually provide limited information about the boundaries of subsurface targets. A recent development of seismic traveltime tomography incorporated with a boundary-preserving regularization constraint promisingly helps to resolve ambiguities in reservoir boundaries, while allowing lateral variations. We applied a kind of boundarypreserving traveltime tomography to delineate boundaries of the reservoir and CO2-saturated zones.We chose the minimum gradient support as the regularization to preserve boundaries of the geologic target by penalizing smaller model gradients and smoothing small model variations caused by noise. We evaluated several synthetic and real data applications. Synthetic examples demonstrated that the boundary-preserving algorithm produced improved recovery of the profile shape and velocity values of the blocky targets. Two real applications were for delineating the top and base of the reservoir in the King Mountain field, and for delineating a CO2-saturated zone in the McElroy field. These inversion results suggested that the boundarypreserving inversion is able to provide better delineation of the top and base boundaries of the reservoir and boundaries of the CO2-saturated zone than the conventional smooth-constrained inversion.",
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Applications of boundary-preserving seismic tomography for delineating reservoir boundaries and zones of CO2 saturation. / Zhu, Tieyuan; Harris, Jerry M.

In: Geophysics, Vol. 80, No. 2, 01.01.2015, p. M33-M41.

Research output: Contribution to journalArticle

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