Multicomponent seismic characterization and monitoring of the CO2 flood at Weyburn Field, Saskatchewan

Davis, Thomas L.; Terrell, Martin; Benson, Robert D.; Cardona, Reynaldo; Kendall, Robert; Winarsky, R.

doi:10.1190/1.1599699

Cited by 62 publications

(37 citation statements)

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“…As an example, a 4D dataset recorded at Weyburn Field, Canada, has been used to infer time-lapse changes in the oil reservoir caused by a massive miscible CO 2 flood to enhance oil recovery. 8,9 The main goal of these 4D studies is to extract information about local changes in the reservoir using mainly the amplitude information. The fine structure of strongly scattered waves can provide a wealth of new information in seismology, ultrasonics, acoustics, and other fields that study wave propagation in heterogeneous media.…”

Section: Introductionmentioning

confidence: 99%

Time-lapse travel time change of multiply scattered acoustic waves

Pacheco

Snieder

2005

The Journal of the Acoustical Society of America

172

162

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Existing techniques in correlation spectroscopy, such as coda wave interferometry and diffusing acoustic wave spectroscopy, determine the average motion of scatterers or change in the propagation velocity from the temporal change of multiply scattered sound. However, neither of them gives an indication of the spatial extent of the change in the medium. This study is an extension of the technique coda wave interferometry, where multiply scattered waves are used to determine the change in the wave field due to a localized perturbation in the propagation velocity. Here, the propagation of multiply scattered sound is described using the diffusion approximation, which allows the cross-correlation function of the unperturbed and perturbed wave fields to be related to the localized change in the propagation velocity. The technique is tested numerically for two-dimensional ͑2D͒ acoustic waves using synthetic seismograms calculated using finite-differences before and after a small perturbation in the propagation velocity has been introduced. Despite the relatively small size and magnitude of the change, multiple scattering greatly amplifies small perturbations, making changes in the phase or travel time of the wave field visible in the later-arriving waveforms. Potential applications of this technique include nondestructive evaluation of inhomogeneous materials and time-lapse monitoring of volcanoes and highly heterogeneous reservoirs.

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Section: Introductionmentioning

confidence: 99%

Time-lapse travel time change of multiply scattered acoustic waves

Pacheco

Snieder

2005

The Journal of the Acoustical Society of America

172

162

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“…October 2000 in an attempt to recover additional 15% of the original oil in place (Davis et al, 2003;Li, 2003). The process of EOR is expected to take about 25 years by injecting an estimated 14 million tons of CO 2 , with the focus on the unswept oil in the porous Marly dolostones (Li, 2003).…”

Section: Nrms (%)mentioning

confidence: 99%

Surface-consistent matching filters for time-lapse processing

Almutlaq

Margrave

2012

SEG Technical Program Expanded Abstracts 2012

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The problem of mismatch between repeated time-lapse seismic surveys remains a challenge, particularly for land acquisition. In this dissertation, we present a new algorithm, which is an extension of the surface-consistent model, and which minimizes the mismatch between surveys, hence improving repeatability.We introduce the concept of surface-consistent matching filters (SCMF) for processing time-lapse seismic data, where matching filters are convolutional filters that minimize the sum-squared error between two signals. Since in the Fourier domain, a matching filter is the spectral ratio of the two signals, we extend the well known surface-consistent hypothesis such that the data term is a trace-by-trace spectral ratio of two datasets instead of only one (i.e. surface-consistent deconvolution). To avoid unstable division of spectra, we compute the spectral ratios in the time domain by first designing tracesequential, least-squares matching filters, then Fourier transforming them. A subsequent least-squares solution then factors the trace-sequential matching filters into four operators: two surface-consistent (source and receiver), and two subsurface-consistent (offset and midpoint).We apply the algorithm to two datasets: a synthetic time-lapse model and field data from a CO 2 monitoring site in Northern Alberta. In addition, two common time-lapse processing schemes (independent processing and simultaneous processing) are compared.We present a modification of the simultaneous processing scheme as a direct result of applying the new SCMF algorithm. The results of applying the SCMF together with the new modified simultaneous processing flow reveal the potential benefit of the method, however some challenges remain, specifically in the presence of random noise.i

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“…Seismic waves are sensitive to fluid properties through their amplitude and velocity. However, the modifications in the seismic waves can be small as shown by Davis et al (2003). Particularly, as injection proceeds at higher levels of CO2, changes become very small.…”

Section: Introductionmentioning

confidence: 99%

Assessing Velocity and Impedance Changes Due to CO2 Saturation Using Interferometry on Repeated Seismic Sources

Barros¹,

O’Brien²,

Bean³

2010

72nd EAGE Conference and Exhibition Incorporating SPE EUROPEC 2010

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The injection of CO2 into saline aquifers produces small changes in seismic properties. The aim of time lapse monitoring is to look for these small variations of the seismic attributes through time, such as the velocity and the impedance, and to relate them to perturbations in the medium properties. However, as injection proceeds, at higher levels of saturation, relative changes in the data become very small. Assuming that a time-lapse seismic survey is a doublet, we can determine the time delay between repeat survey differences, using wave interferometry. These are then relates to velocity changes. Additionally, we can do the same for amplitude variations and determine impedance modifications. We investigate the feasibility of this technique on 1) numerical data computed from a simple layered porous medium; and 2) for synthetic data calculated in a more realistic 3D reservoir using a poro-elastic finite-difference solution. In both cases, the reconstructed values are in good agreement with the true modifications.

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Multicomponent seismic characterization and monitoring of the CO2 flood at Weyburn Field, Saskatchewan

Cited by 62 publications

References 0 publications

Time-lapse travel time change of multiply scattered acoustic waves

Time-lapse travel time change of multiply scattered acoustic waves

Surface-consistent matching filters for time-lapse processing

Assessing Velocity and Impedance Changes Due to CO2 Saturation Using Interferometry on Repeated Seismic Sources

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