Geological lithology or stratigraphy is different than expected
During exploration drilling, the lithology or stratigraphy can differ from the expectiaton due to misinterpretation of exploration data (seismic, well logs available, litterature, etc.) or limited exploration.
Informations
- Category: Risks due to subsurface uncertainties
- Id: D-11
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Phases:
- Drilling / Testing
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Consequences:
- Economic / Performance / Acceptability
Mitigation
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Prevention:
- Accurate collection an interpretation of expected geology for securing information on the target reservoir
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Monitoring:
- Thorough geologicals survey/core sample analysis
- Doing new surface geophysical measurements for the better understanding of expected geology for securing information on the target reservoir
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Corrective measures:
- Find suitable water bearing formation in the already drilled section
- Use well to explore other reservoirs and acquire additional geological and hydrogeological data
- Convert to closed loop system
More information is available on the project deliverable (link), or navigate on the online version.
