Department · Process Safety
Subsurface
Scope
Geoscience, reservoir engineering, petrophysics, reserves and resources, subsurface uncertainty, field development planning inputs, and the integrity of the geological and reservoir models that downstream decisions depend on. The function that owns what is in the ground and what we believe it will do.
The reframing
"Subsurface is rarely seen as a management-system function — it tends to live in a parallel world of technical work that informs decisions but is not formally governed. The framework forces honesty: subsurface uncertainty is a risk (Element 5), reserves classification is a standard (Element 2), the geological model is an asset whose integrity must be assured (Element 6), and reserves audits are a third-line assurance act (Element 10)."
Footprint across the framework
Design integrity
3 documents: Pore Pressure, Stresses and Shear Failure in Well Planning · Overburden Risk Assessment · Overburden Management Guideline
3 docs →
Asset integrity
1 document: Well and Formation Integrity Aspects of Injection
1 docs →
Operating integrity
3 documents: Sleeve Movement Standard · Well Interventions Delivery Process · Well Testing Procedure
3 docs →
People and culture
1 document: Competence Management in Well Planning and Geo-operations
1 docs →
Where Subsurface pivots into other departments
→ WellsWell placement, target uncertainty, drilling envelope
→ EngineeringSubsurface inputs to facility design
→ Finance & LegalReserves audit, divestment due diligence
→ Operations & MaintenanceReservoir performance, well surveillance