31/2-1 R

Exploration · Wildcat · P&A · Oil/gas · A/S Norske Shell · Troll · PL 054

The lithostratigraphic units 31/2-1 R drilled through, shallowest first, with the depth each was met and where it ended. Groups are in bold; the formations within them are indented.

Formation tops

LITHOSTRATIGRAPHY · METRES ALONG THE WELLBORE

Unit	Level	Part of	Top, m	Base, m
Nordland Gp	Group	—	349	526
Hordaland Gp	Group	—	526	1,185
Rogaland Gp	Group	—	1,185	1,406
Balder Fm	Formation	Rogaland Gp	1,185	1,251
Sele Fm	Formation	Rogaland Gp	1,251	1,323
Lista Fm	Formation	Rogaland Gp	1,323	1,394
Våle Fm	Formation	Rogaland Gp	1,394	1,406
Cromer Knoll Gp	Group	—	1,406	1,415
Viking Gp	Group	—	1,415	1,882
Draupne Fm	Formation	Viking Gp	1,415	1,441
Sognefjord Fm	Formation	Viking Gp	1,441	1,532.5
Heather Fm	Formation	Viking Gp	1,532.5	1,595.5
Fensfjord Fm	Formation	Viking Gp	1,595.5	1,742.5
Krossfjord Fm	Formation	Viking Gp	1,742.5	1,881
Heather Fm	Formation	Viking Gp	1,881	1,882
Brent Gp	Group	—	1,882	1,986
Dunlin Gp	Group	—	1,986	2,293.5
Drake Fm	Formation	Dunlin Gp	1,986	2,094
Cook Fm	Formation	Dunlin Gp	2,094	2,135
Amundsen Fm	Formation	Dunlin Gp	2,135	2,177
Johansen Fm	Formation	Dunlin Gp	2,177	2,273.5
Amundsen Fm	Formation	Dunlin Gp	2,273.5	2,293.5
Statfjord Gp	Group	—	2,293.5	2,382
Hegre Gp	Group	—	2,382	2,434

About this data

Norwegian Offshore Directorate (Sodir) FactPages, mirrored nightly and used under the Norwegian Licence for Open Government Data (NLOD). Tops are the Directorate's lithostratigraphy for the wellbore, in metres along the wellbore from the kelly bushing. A unit filed as No Formal Name or No Group Defined is the Directorate's placeholder where nothing is named.

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