Adding the Temporal Coherence Dimension to 4D Seismic Data - Assessing Connectivity in the Schiehallion Field

Floricich, Mariano; Evans, Andrew; McCormick, David S.; Jenkins, G. W.; Stammeijer, Jan

doi:10.3997/2214-4609.20147665

Cited by 5 publications

(6 citation statements)

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“…As a result, existing barriers have been modified in the FFM (location and transmissibility) and new barriers added. The update of the reservoir model with the new set of barriers permitted a better match between the reservoir simulation and the observed 4D seismic effects (Floricich et al 2008). The overall result is that connectivity has reduced in the FFM as more compartments have been revealed.…”

Section: Field Compartmentsmentioning

confidence: 89%

“…differentiation between gas saturation increase or pressure increase of the softening response). Floricich et al (2008) describes a seismic 4D based method that can be used to analyse flow barriers between reservoir compartments. Coherence analysis (measure of similarity between the adjacent seismic traces) is used to assess the spatial variability of the time-lapse seismic.…”

Section: Field Surveillancementioning

confidence: 99%

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Turbidite reservoir compartmentalization and well targeting with 4D seismic and production data: Schiehallion Field, UK

Gainski

MacGregor

Freeman

et al. 2010

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This paper discusses integration of production surveillance techniques, focusing on the use of 4D seismic data to identify reservoir compartmentalization. We present two examples of recently drilled compartments that were successfully identified following integration of surveillance data with detailed reservoir modelling work. Our examples are from the faulted, Paleocene channelized turbidite reservoirs of the Schiehallion oil field, offshore West of Shetlands, U.K. The first example provides a good case history of a 4D Integrated Reservoir Modelling (4D IRM) approach -which involved integration of dynamic well data with 4D seismic, and iterative revision of geological and reservoir simulation models. Two newly identified targets were drilled and completed successfully using these techniques. The second example illustrates a situation where 4D seismic interpretation was key in identifying a new infill target.Production in the Schiehallion Field started in 1998, and the current development scheme totals 46 wells (22 producers and 24 water injectors). During the early years of production it became apparent that geological connectivity, fluid flow and pressure communication between wells was not as inter-connected as expected. As a result the number of wells required to maximize the recovery has more than doubled to that specified in the original development plan, and the number is expected to increase further as the field matures. Continuous collection of bottom hole pressure data from permanently installed gauges, well testing and production logging (PLT) supported by a regular time-lapse (4D) seismic programme are used to update conceptual thinking and thus constrain geological and flow simulation modelling. This data integration results in improved understanding of the static and dynamic reservoir compartmentalization and well connectivity.

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Section: Field Compartmentsmentioning

confidence: 89%

Section: Field Surveillancementioning

confidence: 99%

Turbidite reservoir compartmentalization and well targeting with 4D seismic and production data: Schiehallion Field, UK

Gainski

MacGregor

Freeman

et al. 2010

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“…Connectivity has been recognised as a key factor for reservoir management (Parr et al 2000). These data have been previously studied for connectivity by Al-Maskeri and MacBeth (2005), Stephen and MacBeth (2006) and Floricich et al (2008). The proposed method is tested on segment 4 in the south eastern portion of the field, where the 4D signal is dominantly pressure driven.…”

Section: Application To the Schiehallion Fieldmentioning

confidence: 99%

Direct correlation of 4D seismic and well activity for dynamic reservoir interpretation

Huang¹,

MacBeth²

2009

SEG Technical Program Expanded Abstracts 2009

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A method is proposed which identifies areas in the 4D seismic response which directly correlate with well activity, and hence are consistent with the reservoir engineer's understanding of the field. This approach makes use of the essential requirement for a causal relationship between the seismic difference signatures and the cumulative produced or injected volumes. The method relies upon the use of multiple and frequently shot seismic surveys over a common reservoir area. It is applied to data from the Schiehallion field, West of the Shetland Islands, and the resultant signals are observed to be robust, with a much reduced noise level and to enhance particularly weak 4D seismic signatures. The results may be indicative of regions of connectivity associated with each well.

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“…Similar projects were implemented on the Clair field (Foster et al 2008), the Snorre field (Morton, Andersen and Thompson 2009) and the Ekofisk field (Haugvaldstad et al 2010). In the wider context, many fields such as Norne (Osdal and Alsos 2010) and Schiehallion (Floricich et al 2008) were repeatedly shot with seven or eight towed streamer surveys at intervals of 12–24 months apart. Furthermore, the potential of multiple repeated surveys is now beginning to be recognized.…”

Section: Introductionmentioning

confidence: 99%

Direct correlation of 4D seismic with well activity for a clarified dynamic reservoir interpretation

Huang

MacBeth

2011

Geophysical Prospecting

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A B S T R A C TA method to provide an improved time-lapse seismic attribute for dynamic interpretation is presented. This is based on the causal link between the time-lapse seismic response and well production activity taken over time. The resultant image is obtained by computing correlation coefficients between sequences of time-lapse seismic changes extracted over different time intervals from multiply repeated seismic and identical time sequences of cumulative fluid volumes produced or injected from the wells. Maps of these cross-correlations show localized, spatially contiguous signals surrounding individual wells or a specific well group. These may be associated with connected regions around the selected well or well group. Application firstly to a synthetic data set reveals that hydraulic compartments may be delineated using this method. A second application to a field data set provides empirical evidence that a connected well-centric fault block and active geobody can be detected. It is concluded that uniting well data and time-lapse seismic using our proposed method delivers a new attribute for dynamic interpretation and potential updating of the model for the producing reservoir.

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Adding the Temporal Coherence Dimension to 4D Seismic Data - Assessing Connectivity in the Schiehallion Field

Cited by 5 publications

References 0 publications

Turbidite reservoir compartmentalization and well targeting with 4D seismic and production data: Schiehallion Field, UK

Turbidite reservoir compartmentalization and well targeting with 4D seismic and production data: Schiehallion Field, UK

Direct correlation of 4D seismic and well activity for dynamic reservoir interpretation

Direct correlation of 4D seismic with well activity for a clarified dynamic reservoir interpretation

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