Scope 1–3 GHG inventory and emission factor mapping for a Qatar upstream operator
Full Scope 1, 2, and 3 GHG inventory under GHG Protocol and IPCC-aligned emission factors for a leading Qatar upstream oil and gas operator. Methodology built for OGMP 2.0 reporting maturity.
Client · A Qatar-based upstream oil and gas operator
- Scope coverage Scopes 1, 2, 3
- Methodology GHG Protocol · IPCC AR6
- Reporting context OGMP 2.0 readiness
The situation
A Qatar-based upstream oil and gas operator needed a defensible Scope 1, 2, and 3 GHG inventory to support sustainability reporting, sustainable finance instruments, and the operator’s progression toward Oil & Gas Methane Partnership 2.0 (OGMP 2.0) reporting maturity. Existing emissions reporting was emission-factor-driven and Scope 1-only at site level, with no Scope 3 framework and limited methodology documentation that could survive verification.
The technical priority was a defensible Scope 1 inventory aligned with IPCC emission factor guidance — and a Scope 3 framework that could be built progressively as supplier and value chain data became available.
The work
Boundary setting. Operational control consolidation across well-pad, gas processing, and ancillary infrastructure. Joint-venture allocation rules documented for partner reporting reconciliation.
Scope 1 — direct emissions.
- Combustion emissions across stationary and mobile sources
- Fugitive emissions from venting, flaring, and equipment leaks (LDAR-aligned methodology)
- Methane emissions specifically tagged under OGMP 2.0 Level 3 reporting structure (pathway to Level 4–5 measurement-based reporting flagged for next phase)
- IPCC AR6 GWPs applied across CO₂, CH₄, and N₂O
Scope 2 — purchased energy. Location-based and market-based methods both calculated; market-based methodology applied where renewable PPAs or guarantees existed.
Scope 3 — value chain. Screening across all 15 GHG Protocol categories. Material categories prioritised for first-cycle quantification (purchased goods & services, capital goods, fuel- and energy-related activities, business travel). Spend-based methodology with primary-data uplift roadmap for material suppliers.
Methodology package. Calculation engine built with full audit trail, source documentation, and methodology notes. Working papers structured for verification under ISO 14064-3 in subsequent cycles.
The outcome
First-cycle Scope 1, 2, and 3 inventory delivered with documented methodology, calculation reproducibility, and a maturity pathway to OGMP 2.0 Level 4 reporting. Output supported subsequent sustainability disclosures and was structured to align with regulatory submissions.
What we’d do differently
- Methane source classification earlier. OGMP 2.0 Level 3-to-4 transition depends on source-level detail. Starting with the Level 4 source taxonomy from the outset (rather than retrofitting it post-Scope 1 build) would have saved a methodology pass.
- Scope 3 data quality scoring. We applied the PCAF-style data quality score retrospectively. Building it into the calculation engine from the start would have made the prioritisation conversation with finance easier.