32.4° API Light Oil Discovery Confirmed at C-1 well with 38 Metres Net Pay
Trillion Energy International has announced a significant light oil discovery at the Çetinkaya-1 ('C-1') well in Southeast Türkiye, and a strategic realignment to focus on high-impact oil exploration.
Light Oil Discovery at Çetinkaya-1 Confirms Mardin Group Potential
The Company reports that the C-1 exploration and appraisal well on Block M47C3,C4 in Sirnak Province, has successfully confirmed 32.4° API light oil within the Cretaceous Beloka and Mardin Group carbonates.
A wireline logging programme was conducted, including gamma ray, dual laterolog resistivity (shallow and deep), compensated density, compensated neutron porosity, sonic, spontaneous potential, and multi-arm caliper. Log analysis was performed using Archie's equation with parameters calibrated to the C-1 formation conditions
Key technical highlights include:
- Hydrocarbon-bearing intervals confirmed in both the Beloka and Mardin formations
- Fractured dolomitic oil reservoir containing light oil (32.4 API)
- 38.0 metres of net oil pay identified within a 76.6-metre gross reservoir interval, representing a ~50% net-to-gross ratio. Fracture-adjusted gross pay: of about 40.6 m with fracture-adjusted net pay: about 36.0–38.5 m
- Average effective porosity (PHIE): 5.5%; Estimated fracture-enhanced effective permeability 5–50 mD, with potential upside; average water saturation (Sw): 25%
- Best reservoir interval 7m shows PHIE up to 8.1% and Sw as low as 8%, indicated >90% oil saturation
- Reservoir composed predominantly of dolomitic carbonate (77% dolomite), consistent with productive regional analogues
- Best log-derived oil saturated reservoir intervals (~2418–2448 m) have not been properly tested.
- A 30-barrel 15% hydrochloric acid stimulation occurred, confirming fracture permeability and produced 32.4° API light oil at increasing oil cuts, reaching 36% oil cut in the final swab campaign.
- Importantly, the well intersected only ~38 metres of a targeted 250–350 metre reservoir section, as drilling was halted at 2,455 metres due to loss of circulation. Additional reservoir section (~160+ metres) remains unpenetrated due to early termination of drilling
Net pay cut-off criteria: water saturation (Sw) ≤ 50%; matrix porosity (φ) ≥ 3.0% and PHIT ≥ 4%.
Key observations from the zone data:
- Zone A (2,384–2,397 m) is the primary target with 13.0 m of net pay and has not yet been perforated. This represents a near-term testing opportunity in the existing wellbore
- The Near TD zone (2,447–2,455 m) shows an improving reservoir trend at total depth, indicating that the deeper, untested and unpenetrated reservoir section to be accessed by a planned sidetrack
- Multiple stacked pay zones were identified across the Beloka and Derdere Formations, demonstrating a robust, multi-zone oil system
Significant Upside Identified at Structural Crest accessible by sidetracking
The C-1 well was drilled on the eastern flank of the North Lead structure near the spill point, suggesting that only a limited portion of the hydrocarbon column was encountered. A follow-up sidetrack well (C-1ST) is now planned to target the structural crest, approximately 75–100 metres higher, where the interpreted oil column is significantly greater.
Strategic Location Near Major Producing Field
Block M47C3,C4 is located approximately 11 km southeast of Türkiye’s largest onshore oil discovery, the Sehit Aybüke Yalçin field, which produces from the same Beloka and Mardin Group carbonate reservoirs.
The Company believes the reservoir characteristics observed at C-1, including oil gravity, porosity, and fracture-driven flow, are directly analogous to those of nearby producing fields, reinforcing the commercial potential of the North Lead oil discovery.
About the Company
Trillion Energy International Inc. is focused on oil and natural gas exploration and production in Türkiye. The Company has an agreement to earn a 29% working interest in the M47 oil exploration block (c3 and c4 licenses) located in the Cudi-Gabar petroleum province of Southeastern Türkiye.
Source: Trillion Energy
