6507/4-3 S

The 6507/4-3S exploration well is located on the Dønna Terrace in the Norwegian Sea. The target for the well was the Peder prospect which was defined by an amplitude anomaly in the Cretaceous Intra Lange Formation. The well location was placed just inside a subtle 4-way-dip closure, but the pre-drill prospect model premised also presence of a stratigraphic trap element to fill the entire pre-drill amplitude prospect.

Operations and results

The well was spud 28th April 2022 with the semi-submersible Transocean Norge rig in approximately 435 meter water depth as a slightly deviated S-shaped well. The well was drilled to a total depth of 3,988 m MD RKB / 3,947 m TVD RKB. The target came in close to prognosis (~2 m TVD shallow). After initial signs of hydrocarbons in the reservoir, heads-up coring was conducted, followed by pre-defined success scope wireline logging, before the well was permanently plugged and abandoned after 48 days of operations. The well encountered only a 0.5 m Intra Lange Formation pay interval within the pre-defined small 4- way-dip closure, with a residual hydrocarbon column in the rest of the sandstone interval. This outcome suggests lack of an effective stratigraphic trap element but indicates potential presence of a larger trap in the past. Although the well did encounter gas, and was classified as a discovery, the outcome was risked as a failure case in the pre-drill evaluation.

In addition to the trap