Since discovery of the Oymantepe oil field by AME in 2014 in the East Sadak license, the Reşan license has become AME’s one of the core assets. The license offers a huge potential for exploring oil in multiple play concepts with its proven Cretaceous hydrocarbon system; thrust structures along the Tilan-Başur-Reşan axis, Mardin “Leads” in tectonically more stable Eastern part of the license, and the shallow amplitude plays in Eocene-Oligocene age formations.
The main target reservoirs are Upper Cretaceous aged Beloka and Mardin Group carbonates within the Reşan-Başur anticline. There are several wells with oil tests along this trend in the license area; Başur-1 (1965) produced 325 bbl oil during testing the well, Reşan-5 (1957) tested oil at a DST (20 litres oil) and oil shows were observed during the drilling of Reşan 2 and 3 (1955). Moreover, Kurtalan-1 (1961) which is only 3.8 km downdip from Tilan-1 (1966), produced 219,000 bbl of 33 API oil from Garzan formation between 1961-1971.
In June 2021, Başur-3 exploration well was spudded to twin the oil-tested Başur-1 well, however it did not reach to the planned TD due to technical reasons and it was P&Aed in July 2021 in Lower Germav formation.
During the 2D seismic data acquisition program in 2022, light oil seepages (41-47 API) observed in several explosive shot holes. Oil shows were also observed at the Germik base limestone interval during drilling a nearby geothermal well (Kezer-1) in 2019. Emulsion came to surface during lowering the 9 5/8” casing to top of Hoya formation. Additinally, after identifying near surface amplitude anomalies associated with positive indicators from post-stack seismic attributes on one of the legacy 2D seismic lines running across both the shot hole and the geothermal well, shallow amplitde play concept has been developed.
During 2022, extensive geological field studies were carried out in the Reşan-Başur area to understand and explain the structural elements in details. All the surface geology data has been combined with the seismic-well data interpretations to redefine the prospective areas for drilling.
Mardin “Leads” in the city of Siirt area is another prospective area which requires additional gravity and 2D seismic data acquisition to mature them to prospect level for drilling. Therefore, additional 2D seismic program has been planned for 2023.