GLIAG Technical Note GLIAG-NOTE-2026-10-05-KMM · GIP/KMM-01

Is the Golden Lane the Main Receiver of ACT Charge?

Reading the GIP Kitchen Maturity Map (top ACT, 0 Ma) against discovery distribution in the Guyana–Suriname Basin

Drs. M.P.T. Chin-A-Lien, MBA, M.Sc., Ing. Geologist
AAPG Certified Professional Geologist Nr. 5201-1996 · EFG Chartered European Geologist Nr. 92-1996 · AIEN Energy Negotiator June 2021

Golden Lane Investments Advisory Group B.V. (GLIAG B.V.) · Zoetermeer/Delft and Paramaribo · 5 October 2026

Executive summary

On the GLIAG GSB Intelligence Platform™ kitchen maturity map, does the Golden Lane — the most prolific fairway in discoveries and reserves — appear not to be the area that received most of the oil and gas generated?

No. The map supports the opposite. The mature ACT belt (0.6–1.3 %Ro) runs directly beneath the Golden Lane, from Stabroek south-east through Canje, Corentyne, Block 58 and Block 52. The Golden Lane is both the principal kitchen and the principal receiver.

The opposite impression arises because the layer shows maturity rather than received charge, shows only the top of the ACT, and because other mature areas look comparable on colour but remain largely untested or retention-limited.

1. The observation

The GIP/KMM-01 module (Kitchen Maturity Map, ACT and Aptian through Time) is a pseudo-3D screening of 4,498 offshore 5′ cells, each with a BMS-01 burial-maturation column. It uses GlobSed v3 and ETOPO 2022 geometry, the well-constrained depth-to-ACT case, GLIAG’s in-house legacy heat-flow model (38 → 60) and Suriname in-house kinetics calibrated on ODP 1260. Figure 1 shows the present-day (0 Ma) layer: %Ro at top ACT.

At first glance the colours invite a question. Large mature areas also exist outside the Golden Lane, while much of the deepwater appears immature. Does the discovery fairway really coincide with where most hydrocarbons went?

2. The Golden Lane is the kitchen as well as the receiver

The 0 Ma snapshot places the oil window directly beneath the Campanian–Maastrichtian slope-fan and channel systems that host the Golden Lane discoveries. The Upper Cretaceous–Paleocene shelf-margin wedge loaded the ACT precisely where those reservoirs were being deposited. Charge needed only short vertical or lateral migration into stratigraphic traps that formed at the same time as the source matured.

This “kitchen on the doorstep” geometry is the most efficient charge configuration a passive margin can offer: short carrier distances, minimal migration loss, and trap formation contemporaneous with expulsion. It is a principal reason the fairway outperforms the rest of the basin.

Fluid phase as independent validation

The phase of the discoveries matches the modelled maturity. The small hot spot above 2.0 %Ro around Haimara and Kawa lies next to gas-condensate and light-oil results, while the oil discoveries of Stabroek and Block 58 sit on the 0.6–1.0 %Ro flanks. At screening grade, that is a meaningful fit between model and observed fluids.

3. What a top-ACT maturity map cannot show

A maturity map is not a charge map. Three steps separate “where the source is mature” from “what each area received”:

Missing element	Why it matters	GIP implication
Expelled mass	Charge scales with TOC × HI × thickness × transformation ratio. The richest and thickest ACT may underlie the Golden Lane even where colours look similar elsewhere.	Add a kg HC/m² layer per cell.
Full source column	Base ACT and the Aptian (700 m below ACT base in this run) are hotter than the top. Where the top is in early oil, deeper intervals may be in the gas window; the true expulsion centre is deeper and earlier.	Show mid- and base-ACT and Aptian maturity.
Migration focusing	Carrier-bed and seal geometry decide where charge goes, not where it was generated. Outboard and eastern kitchens may drain toward, or away from, the Golden Lane.	Fill-spill or flow-path run on top-ACT and base-seal surfaces.

4. Mature areas outside the Golden Lane

Three areas show maturity comparable to the Golden Lane without equivalent results. In each, the evidence points to risks other than source:

• Eastern Suriname belt (GeoAtlas Dip 3, Demerara-1, around Block 64). The maturity is plausible but rests on GLIAG-interpreted seismic and depth conversion, not well depth. Results here suggest reservoir, seal or trap-timing risk rather than source failure.
• French Guiana slope (Zaedyus, Nasua, GM-ES series). A proven but narrow, segmented system: the 2011 Zaedyus discovery was not followed by appraisal success. A working kitchen with weak retention, not a lack of generation.
• NW Guyana–Venezuela corner. The hottest area on the map, probably past the oil window and the earliest generator. Part of its early charge may have been lost before traps existed, or migrated toward Pomeroon and western Stabroek.

5. The deepwater: real or model artefact?

The immature outboard area (Blocks 63 and 65, Galibi Offshore) needs cautious reading. It can be real: the sedimentary section thins basinward over transitional crust, and the legacy heat-flow model is low. But this is also where depth-to-ACT control is weakest and where the low end of the heat-flow range dominates.

This is the largest single sensitivity in the map. If the deepwater ACT lies a few hundred metres deeper, or heat flow is higher, the outboard kitchen switches on — making it a donor to the Golden Lane rather than a dead zone.

6. Exploration bias

The Golden Lane is also the most intensively drilled part of the basin. Its dominance in discoveries partly reflects how thoroughly it has been tested. Mature areas elsewhere should not be read as failed simply because they are less proven.

7. Conclusion

The kitchen maturity map does not contradict the Golden Lane concept; it reinforces it. The fairway sits on the mature kitchen, receives charge over short distances, and shows a fluid-phase pattern that matches modelled maturity. The open questions lie elsewhere: whether the eastern and outboard kitchens are real extension upside or a charge-loss story, and how much the deeper source column and migration focusing add to what the top-ACT layer shows.

8. Next steps on the GLIAG GSB Intelligence Platform™

1. Add an expelled-mass layer (kg HC/m² per cell) alongside %Ro.
2. Display mid-ACT, base-ACT and Aptian maturity in addition to top ACT.
3. Run a fill-spill or flow-path overlay on the top-ACT and base-seal surfaces.
4. Post discovered volumes as bubbles so charge and accumulations can be compared directly.
5. Run heat-flow and depth-to-ACT sensitivity cases for the deepwater outboard area.
6. Extend the Tmax control set (ODP 1257/1258, A2-1, FG2-1, GM-ES) to calibrate eastern and outboard cells.

With these layers in place, “most generated versus most received” becomes testable cell by cell.

Disclaimer and legal notice

1. No advice. This note is for information and discussion only and does not constitute investment, legal, tax, technical or financial advice.

2. No offer or solicitation. Nothing herein is an offer, solicitation or recommendation to buy, sell or hold any security, licence interest or asset.

3. Independence of analysis. The analysis is GLIAG’s own, based on public sources, operator disclosures and in-house screening models. It is not endorsed by any operator, government or agency. Model outputs are screening grade, not calibrated basin models.

4. Forward-looking statements. Interpretations of charge, prospectivity and extension potential are forward-looking, subject to uncertainty, and may differ materially from future results.

© 2026 Marcel P.T. Chin-A-Lien / Golden Lane Investments Advisory Group B.V. All rights reserved. Golden Lane™, GLIAGOGRAPH™ and GLIAG GSB Intelligence Platform™ are trademarks of GLIAG. No part of this document may be reproduced or distributed without prior written permission. Pursuant to Article 4(3) of Directive (EU) 2019/790, the rightsholder expressly reserves the use of this work for text and data mining, including the training of artificial intelligence and machine-learning models.

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