Time-lapse 2D Seismic Steamflood Monitoring - A Case Study from Offshore Republic of Congo, the Emeraude Field

Benguigui, Amran; Roberts, Gareth; Shaw-Champion, M.

doi:10.3997/2214-4609.20148837

Cited by 2 publications

(4 citation statements)

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“…The magnitude of this slowdown can be modelled in a similar way to the gas injection case described previously. In addition to these mechanisms a large 8 ms slowdown has been observed from gas breakout (Benguigui et al 2012). Smaller time-shifts of a few milliseconds have also been observed: such as slowdown due to pore pressure increase at the injectors and also water saturation effects in Peace River (La Follet et al 2015), or pressure increase pushing free hydrocarbon gas back into solution (Jenkins et al 1997).…”

Section: Steam Injectionmentioning

confidence: 93%

“…In addition to these mechanisms a large 8 ms slowdown has been observed from gas breakout (Benguigui et al . ). Smaller time‐shifts of a few milliseconds have also been observed: such as slowdown due to pore pressure increase at the injectors and also water saturation effects in Peace River (La Follet et al .…”

Section: The Magnitude Of 4d Seismic Time‐shiftsmentioning

confidence: 97%

“…Particularly large time-shifts are observed from the development of the steam chamber (7 ms and 14 ms in Fig. 3) and this effect is clearly of benefit in mapping steam thickness for investigating sweep efficiency (Jenkins, Waite and Bee 1997;Benguigui, Roberts and Shaw-Champion 2012). The magnitude of this slowdown can be modelled in a similar way to the gas injection case described previously.…”

Section: Steam Injectionmentioning

confidence: 99%

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Review Paper: Post‐stack 4D seismic time‐shifts: Interpretation and evaluation

MacBeth

Mangriotis

Amini

2018

Geophysical Prospecting

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A review and analysis of post‐stack time‐lapse time‐shifts has been carried out that covers published literature supplemented by in‐house datasets available to the authors. Time‐shift data are classified into those originating from geomechanical effects and those due to fluid saturation changes. From these data, conclusions are drawn regarding the effectiveness of post‐stack time‐shifts for overburden and reservoir monitoring purposes. A variety of field examples are shown that display the range and magnitude of variation for each class of application. The underlying physical mechanisms creating these time‐shifts are then described, and linked to a series of generic and field‐specific rock physics calculations that predict their magnitudes. These calculations serve as a guide for practitioners wishing to utilize this information on their own datasets. Conclusions are drawn regarding the reliability of this attribute for monitoring purposes, and the extent to which further development is required and how it should be reported by authors.

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Section: Steam Injectionmentioning

confidence: 93%

Section: The Magnitude Of 4d Seismic Time‐shiftsmentioning

confidence: 97%

Section: Steam Injectionmentioning

confidence: 99%

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Review Paper: Post‐stack 4D seismic time‐shifts: Interpretation and evaluation

MacBeth

Mangriotis

Amini

2018

Geophysical Prospecting

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“…We used time shift attributes to analyse the seismic monitoring data at Decatur, a technique that has been applied successfully to monitor fluid movement in oil and gas reservoirs (Benguigui et al, 2012;Falahat et al, 2011;Santos et al, 2016) and to support amplitude interpretation at CO 2 storage sites (Arts et al, 2004;Chadwick et al, 2004Chadwick et al, , 2005Furre et al, 2015;Grude et al, 2013). The results resolve inconsistencies in the previous interpretation, revealing that the CO 2 plume at Decatur has been migrating along major faults previously characterised in the reservoir, and moving in response to injection at a neighbouring site.…”

Section: Introductionmentioning

confidence: 96%

Carbon dioxide migration along faults at the Illinois Basin – Decatur Project revealed using time shift analysis of seismic monitoring data

Bukar,

Bell,

Muggeridge

et al. 2024

Preprint

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Large scale underground storage of CO2 is being deployed worldwide to reduce greenhouse gas emissions to the atmosphere. Modelling studies have investigated the possible risks from the CO2 migrating along faults, but this has not yet been observed. We were able to identify such CO2 migration at a commercial-scale, demonstration CO2 storage project, the Illinois Basin - Decatur Project, including subsequent emergence of the CO2 into overlying permeable layers. Our interpretation resolves previous inconsistencies observed at the project and provides a rare field observation the fluid dynamics of CO2 moving between faults and reservoir lithology. The project had deployed time-lapse 3D vertical seismic profile imaging to study CO2 plume development, interpreted based on the commonly used amplitude attributes. However, factors including survey repeatability, subtle seismic fluid effects and irregular filling of the storage reservoir by CO2 meant that amplitude anomalies due to CO2 were not distinct. Here we apply an alternative interpretation technique to the data based on time shift attributes, resulting in much clearer plume anomalies. This work provides field validations of previously theorised plume behaviours and demonstrates the use of an alternative analysis technique to overcome challenges in interpretation of seismic monitoring data for geological CO2 storage.

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Time-lapse 2D Seismic Steamflood Monitoring - A Case Study from Offshore Republic of Congo, the Emeraude Field

Cited by 2 publications

References 0 publications

Review Paper: Post‐stack 4D seismic time‐shifts: Interpretation and evaluation

Review Paper: Post‐stack 4D seismic time‐shifts: Interpretation and evaluation

Carbon dioxide migration along faults at the Illinois Basin – Decatur Project revealed using time shift analysis of seismic monitoring data

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