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Exploration wellbore: 35/9-3

General information

Wellbore history

General

Well 35/9-3 is located on the Måløy Slope ca 55 km west off Florø town and ca 11 km North of the Gjøa Discovery. The primary objective of the well was to prove commercial oil and gas resources in the C3 prospect of the Early Cretaceous Agat Formation. Secondary targets were seen in the Late Cretaceous to Early Paleocene.

Operations and results

Well was spudded with the semi-submersible installation West Vanguard on 23 September 1997 and drilled to TD at 2783 m, 13 m into Basement rock. Due to repeated mud loss during drilling at about 1900 m depth, the well was technically side-tracked (35/9-3 T2) from 1827 m and to TD. The well was drilled with spud mud down to 1150 m and ANCO 2000 mud from 1150 m to TD.

The well discovered hydrocarbons in reservoir sandstones of the Late Cretaceous, Kyrre Formation and of the Early Cretaceous, Agat Formation. No hydrocarbons were accumulated in the thin sand interval of the Cretaceous Jorsalfare Formation. The main target Agat Formation reservoir contained hydrocarbons in a 44 m sequence of mixed sand and shale layers (2657.5 - 2701.5 m). The uppermost sand layer contained gas with a GOC at 2666.5 m depth. The discovery may relate to an accumulation within a small structural closure at this level.

MDT samples confirmed formation water in the thin sand intervals in the lower part of the Rødby reservoir zone, except in the lowermost sand interval, where oil was sampled. The MDT test showed low mobility and pressure draw down from barriers in the vicinity of the well in these sand layers. The reservoir interval of the Kyrre Formation consisted of stacked thin sands separated by shale layers in the interval 1868 -1904,5 m. The GWC was found at 1896 m and probably relates to a small structural closure with a fill-spill to the east.

A total of five cores were cut in the Agat and Kyrre reservoir intervals. Core no 1 was cut in the first well bore, the other four were cut in the sidetrack. MDT gas samples were taken at 1883.6 m, 1870 m, and 1887.9 m in the Kyrre Formation. MDT oil samples were taken at 2700.6 m, 2683.7 m, 2681.5 m, 2676.5 m, 2670 m, and at 2662.5 m in the Rødby Formation. MDT sampling at 2689.2 m and 2693.5 m retrieved water.

The well was plugged and abandoned on 11 November 1997 as a gas and oil discovery.

Testing

No drill stem test was performed.

Cuttings available at the NPD

Interval [m]: 1150.00 - 2783.00

Cores available at the NPD

Core length [m]: 104.40

Scanned core photos

1870-1875m	1875-1880m	1880-1885m	1885-1880m	2663-2668m
2668-2673m	2673-2675m	2676-2681m	2681-2686m	2686-2691m
2691-2696m	2696-2700m	2701-2703m	2703-2708m	2708-2713m
2713-2718m	2718-2723m	2723-2728m	2728-2730m

Palynological slides available at the NPD

Oil samples available at the NPD

No oil samples available.

Casing and leak-off tests

Mud

Drill stem test

No drill stem test in this wellbore.

Available logs

Lithostratigraphy

Composite log

No composite log presently available.

Geochemical information

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Documents reported by the licencees (period for duty of secrecy expired)

No documents presently available.