The announcement from Trillion Energy International Inc. details a noteworthy discovery at the Çetinkaya-1 (C-1) exploration and appraisal well on Block M47C3,C4 in Şırnak Province, Southeast Türkiye. Wireline logging and limited stimulation work have confirmed the presence of 32.4° API light oil within Cretaceous Beloka and Mardin Group carbonates. The initial encounter represents a fraction of the interpreted reservoir section, and the Company is prioritizing a follow-up sidetrack (C-1ST) to test the structural crest where a larger oil column is interpreted.
Table of Contents:
Discovery highlights and technical results
A detailed wireline logging campaign incorporated gamma ray, dual laterolog resistivity (shallow and deep), compensated density, compensated neutron porosity, sonic, spontaneous potential and multi-arm caliper tools. Log interpretation applied Archie’s equation calibrated for C-1 conditions to estimate saturations and porosity. The well identified roughly 76.6 metres gross reservoir with about 38.0 metres net oil pay, yielding an approximate 50% net-to-gross ratio. When adjusted for fracture contribution, gross and net pays are estimated at ~40.6 m and ~36.0–38.5 m respectively.
Reservoir petrophysics and flow indicators
Average effective porosity (PHIE) was measured at about 5.5%, with an estimated fracture-enhanced effective permeability in the range of 5–50 mD and potential upside where fracturing is more developed. Mean water saturation (Sw) was estimated at ~25%, though invasion during drilling suggests true formation Sw could be materially lower. The best logged interval (approximately 2418–2448 m) was not fully tested but shows the highest interpreted oil saturation. A top-performing 7m interval recorded PHIE up to 8.1% and Sw as low as 8%, implying >90% oil saturation in that window.
Well testing, stimulation and operational limits
The team ran a limited stimulation program using a 30-barrel 15% hydrochloric acid treatment to enhance fracture connectivity. Swab campaigns after stimulation produced 32.4° API oil with oil cuts that rose during operations, reaching a final measured oil cut of 36% in the last swab attempt. Importantly, the reported tests were conducted under non-flowing conditions; they confirm mobile oil and fracture pathways but do not represent sustained commercial rates from a completed well. No sustained production test has been executed to date.
Drilling outcome and remaining reservoir
Drilling was terminated at a total depth of 2,455 m due to loss of circulation, meaning the well penetrated only ~38 metres of an expected 250–350 metre reservoir interval. This early curtailment left over ~160 metres of the target section unpenetrated. The current well sits on the eastern flank of the North Lead structure near the spill point; geological interpretation indicates substantial additional oil column awaits higher on the structure, accessible via a planned sidetrack (C-1ST) approximately 75–100 metres higher on the crest.
Commercial context, analogues and next steps
Block M47C3,C4 lies roughly 11 km southeast of the large onshore Şehit Aybüke Yalçın field, which produces from the same Beloka and Mardin Group carbonates. Observed reservoir attributes—dolomitic composition (≈77% dolomite), fracture-driven flow, oil gravity, and porosity—mirror nearby productive analogues and support the commercial potential of the North Lead accumulation. The operator has an agreement to earn a 29% working interest in the M47 block and plans to target the crest with managed pressure drilling, open-hole logging, and completion strategies designed to capture the interpreted oil column.
Risks, forward-looking considerations and reporting standards
Readers should note that forward-looking plans—such as timing and success of the C-1ST sidetrack, interpretations of structural position, and anticipated reservoir performance—depend on assumptions including rig availability, partner approvals, service access and prevailing market conditions. Risks include geological uncertainty, drilling operational issues like stuck pipe or loss of circulation, reservoir connectivity of the fracture network, regulatory and commodity price exposure. The technical disclosure follows NI 51-101 and COGEH guidelines; definitions such as net pay and gross pay were applied consistently in log-based calculations. Investors are cautioned not to rely on preliminary non-flow tests to predict production rates.
In summary, the C-1 results establish a material light oil presence in fractured dolomitic carbonates with immediate testing targets in the existing borehole and a clear upside via the planned sidetrack to the structural crest. The combination of positive petrophysics, acid-stimulated flow indications and close proximity to major productive fields supports the programmatic shift by Trillion Energy toward high-impact oil exploration on Block M47C3,C4.