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Fault Seal Analysis Using Seismic Inversions: Pitfalls and Limitations
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Fifth International Conference on Fault and Top Seals, Sep 2019, Volume 2019, p.1 - 5
Abstract
If only few data available how can we assess the risk and uncertainty of a hydrocarbon accumulation which relies on the sealing capacity of a fault? We want to present a Fault Seal Analysis approach based on the strong integration of geophysical data. The purpose of this workflow is to deliver prediction on Fault Seal Capacity in areas and prospects where no well data is available or offset wells are too far away to be used for Fault Seal input (e.g. Vshale log). Our study suggests that 3D seismic inversion can be exploited to create a Vsh cube which can be used to “read-out” Vsh values along a planned exploration well path in an underexplored setting. The generated Vsh curve is used for a full 3D FSA which delivers distinct values on the fault sealing capacities and uncertainty ranges on expected hydrocarbon column heights. In order to verify the results of this approach, the inverted VSH data was subsequently compared to CPI data from a drilled exploration well in the AOI. Pitfalls and limitations, especially with regards to lithology and fluid effects, are highlighted.
- 08 Sep 2019