An old geological model can remain in circulation after a newer interpretation has replaced it. The risk is not merely untidy filing: a contractor, consultant or commercial team may continue making decisions from assumptions the technical group has already abandoned.
Name the current model
The project should identify which interpretation is authorised for each purpose and when it became current. A model used for early exploration may remain informative without being suitable for a later engineering decision. Clear status labels help preserve historical knowledge while preventing an obsolete working version from quietly regaining authority through a familiar filename.
Retain the reasoning
Replacing a model should preserve the evidence and explanation behind material changes. Future reviewers need to understand why a boundary moved or an interpretation was rejected. Deleting old versions removes that context; leaving every version equally prominent creates confusion. A controlled archive can support both institutional memory and a clear account of the current technical position.
Notify dependent teams
A revised interpretation can affect test work, engineering, budgets and the questions posed to external reviewers. Publication within the geology team is therefore insufficient. Identify the users whose decisions depend on the change and record how they were informed. This gives project management a practical view of the consequences beyond the specialist workstream that originated the revision.
Control external circulation
Presentations and data-room packages should be checked when the technical position changes. A stale illustration can continue attracting attention long after its assumptions have ceased to guide the project. For asset owners, disciplined retirement of superseded models supports credibility. The objective is not to hide uncertainty, but to show a traceable progression of understanding and ensure that current decisions use the appropriate evidence.
