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ARK CLS Seismic Net Pay
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Seismic Net Pay (SNP) analysis
SNP provides a pre-analysis seismic attribute date preparation facility. This allows average band-limited impedance to be extracted from zero-crossing picks obtained from Seismic Colored Inversion. The flexible and sophisticated Seismic Net Pay analysis module can be entered following seismic attribute data preparation to allow you to estimate net pay together with other surface attributes.
Seismic Net Pay Main Analysis Window
Various tools are provided on the processing controller dialog allowing you to estimate the wavelet and calculate the detuning curve from your Colored Inverted Seismic Cube. This can be applied to the average band-limited impedance attribute. Your first estimation can be adjusted using well data.
Displayed as maps various generated SNP attributes
Through the Seismic Net Pay analysis you can calculate net pay and make an estimate of the uncertainty. The outputs from Seismic Net Pay are a series of seismic attributes including Net Pay, Net to Gross (Depth) and Total Uncertainty. SNP provides a facility to view the attributes as maps from within, prior to output as surface attributes in Petrel.
SNP generated attributes are fully integrated into Petrel
After generating various surface attributes using our Seismic Net Pay plug-in they can be saved in Petrel for future use within your project. The example here shows Net Pay. All calculated SNP attributes can be saved for subsequent use within your workflow.
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Geology and Modelling
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Seismic Net Pay estimates net pay from seismic attributes. More generally SNP can be used to make estimates of either net pay or net rock volume depending on the input data and the calibration. The documentation will refer to net pay throughout but interchangeability with net rock volume should be inferred. The application interfaces directly with the Petrel data store to read and write surface attributes.
Provides a robust workflow for thin and not so thin reservoirs
At critical interaction points the geoscientist is guided by the software
Provides significant improvement over the reflectivity based techniques
Has a proven track record of delivering results over many years
Allows geoscientist to analyse the different sources of uncertainty thus leading to improvements in the final result
Outputs uncertainty maps to constrain reservoir modelling which helps to ensure that models are consistent
Standard outputs in map form include: net pay, seismic net-to-gross (time), seismic net-to-gross (depth) plus QC
Uncertainty outputs in map form include: calibration uncertainty and total uncertainty
The original Seismic Net Pay solution was developed by us in 2005. Based on: Connolly, P.A. 2005, it was significantly enhanced following: Connolly, P.A, 2007 papers in The Leading Edge. The workflow uses Colored Inversion data to provide a robust method to estimate seismic net pay. This provides a significant improvement on reflectivity based techniques using seismic attributes: Simm, R., 2009, Simple net pay estimation from seismic: a modeling study.