Element 05×Subsurface
Subsurface in Risk
Risk Assessment and Control
What Subsurface owns here
This element holds the management of uncertainty — scenario planning, sensitivity analysis, decision-gate risk assessment and the reservoir risk register.
Example documents, by tier
Process, procedure, work instruction 3
- Well Interventions Delivery ProcessIn 2 of 3 operator registersCompany-wideAlso in EI PSM · 08 Operating manuals and proceduresAlso in Process Safety · Operating integrityNot safety case critical
- Subsurface Uncertainty and Risk AssessmentTypical exampleCompany-wideAlso in EI PSM · 06 Hazard identification and risk assessmentNot process safetyNot safety case critical
- Overburden Risk AssessmentIn 1 of 3 operator registersAsset · addsAlso in EI PSM · 06 Hazard identification and risk assessmentAlso in Process Safety · Design integrityNot safety case critical
Guidance · outside the system 2
Informative, not a “shall”. These belong in the knowledge base, not the management system. How this works →
- Overburden Management GuidelineTypical exampleCompany-wideAlso in EI PSM · 06 Hazard identification and risk assessmentAlso in Process Safety · Design integrityNot safety case critical
- Water Management GuidelineIn 1 of 3 operator registersCompany-wideAlso in EI PSM · 11 Standards and practicesNot process safetyNot safety case critical
Why these belong here
"This is about managing uncertainty, not eliminating it."
What does not live here
- →The standards setting acceptance thresholds — (Policies and Standards)E02 Policies
- →The execution of a study — (Plans and Procedures)E07 Procedures
- →The independent peer review of the analysis — (Assurance, Review and Improvement)E10 Assurance