Estimating Yet-to-Find Oil and Gas in Suriname, Blocks 58 and 52

Marcel Chin-A-Lien – Petroleum & Energy Adviosr – January 31, 2026 –

Disclaimer: My independent, charge-constrained perspective for strategic and investment decision-making

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Executive Summary

The Surinamese continuation of the Golden Lane petroleum system—defined here as Blocks 58, 52, and immediately adjacent blocks offshore Suriname—is demonstrably part of a world-class hydrocarbon system shared with Guyana.

Using a conservative, charge-based methodology anchored in peer-reviewed basin modeling, published discovery data, and analog performance from the Guyana Golden Lane, we estimate that the Surinamese Golden Lane still contains material yet-to-find (YTF) oil and gas volumes.

My assessment indicates that, assuming very conservative and low trapping efficiencies, beyond already sanctioned and discovered volumes, the area is capable of supporting:

• Oil (in-place YTF): approximately 0.3 – 1.3 billion barrels, with upside to ~4 billion barrels under higher trapping efficiency scenarios.
• Gas (in-place YTF): approximately 1 – 5 Tcf, with upside to ~13 Tcf under higher efficiency scenarios.

These ranges are consistent with conservative system-scale efficiencies observed in deepwater petroleum provinces and with the magnitude of discoveries already proven on the Guyana side of the Golden Lane.

If higher trapping efficiencies were to be used, the YTF numbers for both oil and gas could accordingly be much higher.

This remains a constant and fundamental challenge and enigma in petroleum geology and in petroleum basins: how much petroleum was generated, how much of this was trapped, and how much remains to be found.

In many cases it tends to be anybody’s guess.

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Area of Interest (AOI)

All calculations apply strictly to the Surinamese Golden Lane AOI, defined as:

• Block 58
• Block 52
• Immediately adjacent offshore blocks sharing boundaries with Blocks 58 and 52

This AOI captures the Suriname continuation of the Golden Lane charge fairway, the same petroleum system that underpins the giant discoveries in Guyana.

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Methodology (Charge-Based, Conservative)

The assessment follows industry-standard petroleum systems practice, emphasizing generation → expulsion → migration → trapping → preservation.

Key methodological pillars

• Source Rock & Charge: The Albian–Cenomanian–Turonian (ACT) source interval is treated as the dominant, proven source rock, using Ultimate Expellable Potential (UEP, mmboe/km²) mapping and maturity modeling.
• Maturity & Timing: Source Transformation Ratio (STS) modeling constrains oil-window versus gas-condensate maturity and timing of expulsion relative to trap formation.
• Migration Style: Deepwater, overpressured systems are assumed to be dominated by vertical migration and fill-and-spill behavior, consistent with observed Golden Lane discoveries.
• System Efficiency: Province-scale retained-in-traps efficiencies are conservatively assumed at:
  • Oil: ~0.2 – 0.8% (primary case)
  • Gas: ~0.1 – 0.5% (primary case)
  Broader upside cases consider moderately higher efficiencies.

All YTF volumes are therefore charge-supported, not prospect-count extrapolations.

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Results: Yet-to-Find Volumes (In-Place)

Primary (Conservative-but-Realistic) Case

• Oil: ~0.3 – 1.3 billion barrels
• Gas: ~1 – 5 Tcf

Broader Upside Case (Higher Trapping Efficiency)

• Oil: up to ~4 billion barrels
• Gas: up to ~13 Tcf

These figures represent hydrocarbons retained in traps (in-place). Recoverable volumes will depend on reservoir quality, field size distribution, development concepts, and recovery factors.

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Context: Comparison with Guyana Golden Lane

The Guyana Golden Lane (Stabroek Block) currently hosts approximately ~11 billion barrels of recoverable resources discovered within roughly a decade of exploration.

Back-calculation using conservative system efficiencies implies that:

• The discovered recoverable volumes represent only a small fraction (<<1%) of total hydrocarbons generated and expelled.
• Total expelled hydrocarbons at province scale are therefore necessarily orders of magnitude larger than what has already been found.

The Surinamese Golden Lane shares the same source rock system, charge fairway, and migration style, but remains significantly less explored—supporting the conclusion that substantial remaining potential is geologically plausible.

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Investment Implications

• The Surinamese Golden Lane is not a marginal extension but a material continuation of a world-class petroleum system.
• Charge is demonstrably sufficient; remaining risk lies primarily in trap definition, reservoir distribution, and phase prediction.
• Gas and gas-condensate potential increases basinward and in later-maturing segments, complementing oil-led development.

For investors, the key takeaway is that the province is still in an early-to-mid exploration phase relative to its total charge endowment.

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References & Data Sources

• GeoAtlas of Suriname – Petroleum Systems & Source Rock Modeling (ACT UEP, STS maturity, burial history)
• Public operator disclosures: ExxonMobil, Hess, CNOOC (Guyana Golden Lane / Stabroek Block)
• TotalEnergies & APA press releases (GranMorgu development, Block 58)
• Petronas disclosures and public reporting (Block 52 discoveries)
• Industry analogs for deepwater trapping efficiency and migration style

All estimates are subject to geological uncertainty and are intended for strategic and investment evaluation, not as reserves statements.