An effective crosswell seismic traveltime-estimation approach for quasi-continuous reservoir monitoring

Arogunmati, Adeyemi; Harris, Jerry M.

doi:10.1190/geo2011-0197.1

Cited by 7 publications

(6 citation statements)

References 21 publications

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“…Continuous monitoring of seismic attenuation using repeated active sources can partially remedy the problem and would provide important insights into the dynamic state of a CO 2 plume. Also, CO 2 reservoirs will benefit from an effective continuous seismic monitoring strategy to ensure efficient and timely management decisions [ Arogunmati and Harris , , ].…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal changes of seismic attenuation caused by injected CO₂ at the Frio‐II pilot site, Dayton, TX, USA

2017

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A continuous active source seismic monitoring data set was collected with crosswell geometry during CO2 injection at the Frio‐II brine pilot, near Liberty, TX. Previous studies have shown that spatiotemporal changes in the P wave first arrival time reveal the movement of the injected CO2 plume in the storage zone. To further constrain the CO2 saturation, particularly at higher saturation levels, we investigate spatial‐temporal changes in the seismic attenuation of the first arrivals. The attenuation changes over the injection period are estimated by the amount of the centroid frequency shift computed by local time‐frequency analysis. We observe that (1) at receivers above the injection zone seismic attenuation does not change in a physical trend; (2) at receivers in the injection zone attenuation sharply increases following injection and peaks at specific points varying with distributed receivers, which is consistent with observations from time delays of first arrivals; then, (3) attenuation decreases over the injection time. The attenuation change exhibits a bell‐shaped pattern during CO2 injection. Under Frio‐II field reservoir conditions, White's patchy saturation model can quantitatively explain both the P wave velocity and attenuation response observed. We have combined the velocity and attenuation change data in a crossplot format that is useful for model‐data comparison and determining patch size. Our analysis suggests that spatial‐temporal attenuation change is not only an indicator of the movement and saturation of CO2 plumes, even at large saturations, but also can quantitatively constrain CO2 plume saturation when used jointly with seismic velocity.

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Section: Discussionmentioning

confidence: 99%

Spatiotemporal changes of seismic attenuation caused by injected CO₂ at the Frio‐II pilot site, Dayton, TX, USA

2017

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“…Arogunmati () and Arogunmati and Harris () showed how the quasi‐continuous data‐estimation problem can be expressed as:

{boldd}_{c}^{k} = {boldd}_{s}^{k} + {boldd}_{u}^{k},

where

d_{s}^{k}

is the accumulated sparse data set at survey/monitor time k and

d_{u}^{k}

is the accumulated unrecorded data set at survey/monitor time k . An accumulated data set consists in the baseline and time‐lapse surveys merged along the slow‐time axis.…”

Section: Methodsmentioning

confidence: 99%

“…It has the potential to be the foundation for continuous seismic reservoir monitoring. The strategy can be used on seismic traveltime (Arogunmati and Harris ) or seismic full‐trace data. Our approach accounts for differences in the data acquisition footprint prior to imaging or inversion, in the data space.…”

Section: Introductionmentioning

confidence: 99%

Quasi‐continuous reservoir monitoring with surface seismic data

Arogunmati

Harris

2013

Geophysical Prospecting

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A B S T R A C TWe present an approach that creates the possibility of reservoir monitoring on a quasi-continuous basis using surface seismic data. Current strategies and logistics for seismic data acquisition impose restrictions on the calendar-time temporal resolution obtainable for a given surface-seismic time-lapse monitoring program. One factor that restricts the implementation of a quasi-continuous monitoring program using conventional strategies is the time it takes to acquire a complete survey. Here quasicontinuous monitoring describes the process of reservoir monitoring at short-time intervals. Our approach circumvents the restriction by requiring only a subset of complete survey data each time an image of the reservoir is needed using surface seismic data. Ideally, the time interval between survey subset acquisitions should be short so that changes in the reservoir properties are small. The accumulated data acquired are used to estimate the unavailable data at the monitor survey time and the combined recorded and estimated data are used to produce an image of the subsurface for monitoring. We will illustrate the effectiveness of our approach using 2D and 3D synthetic seismic data and 3D field seismic data. We will explain the benefits and drawbacks of the proposed approach.

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“…We use data collected between wells A and C. The well spacing is approximately 190 m (∼620 ft). Harris et al (1995) describe the data collection procedure and relevant survey parameters (also see Lazarotos and Marion, 1997; Arogunmati and Harris, 2012). The first-arrival traveltimes for baseline (1993) and repeat surveys (1995) were picked and subtracted to obtain the traveltime difference.…”

Section: Case Ii: Delineating the Co 2 -Saturated Zonementioning

confidence: 99%

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

Zhu

Harris

2015

GEOPHYSICS

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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 CO 2 -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 CO 2 -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 CO 2 -saturated zone than the conventional smooth-constrained inversion.

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An effective crosswell seismic traveltime-estimation approach for quasi-continuous reservoir monitoring

Cited by 7 publications

References 21 publications

Spatiotemporal changes of seismic attenuation caused by injected CO₂ at the Frio‐II pilot site, Dayton, TX, USA

Spatiotemporal changes of seismic attenuation caused by injected CO₂ at the Frio‐II pilot site, Dayton, TX, USA

Quasi‐continuous reservoir monitoring with surface seismic data

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

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An effective crosswell seismic traveltime-estimation approach for quasi-continuous reservoir monitoring

Cited by 7 publications

References 21 publications

Spatiotemporal changes of seismic attenuation caused by injected CO2 at the Frio‐II pilot site, Dayton, TX, USA

Spatiotemporal changes of seismic attenuation caused by injected CO2 at the Frio‐II pilot site, Dayton, TX, USA

Quasi‐continuous reservoir monitoring with surface seismic data

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

Contact Info

Product

Resources

About

Spatiotemporal changes of seismic attenuation caused by injected CO₂ at the Frio‐II pilot site, Dayton, TX, USA

Spatiotemporal changes of seismic attenuation caused by injected CO₂ at the Frio‐II pilot site, Dayton, TX, USA