16/1-4
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General information
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Wellbore history
GeneralThe objectives of exploration well 16/1-4 were to test Paleocene sandstones (Heimdal Formation) in prospect C and Eocene sandstones (Grid Formation) in prospect D. Prospect C was the main target. Oil was the prognosed hydrocarbon type. It was expected to penetrate a pre-Cretaceous sedimentary sequence, although the well location was not optimal for a test of the pre-Cretaceous.Operations and resultsWildcat well 16/1-4 was spudded with the semi-submersible installation "Deepsea Bergen" on 17 March 1993 and drilled to TD at 2010 m, 146 m into basement rocks. The well was drilled with spud mud / hi-vis pills down to 324 m and with "ANCO 2000" mud from 324 m to TD. Well 16/1-4 penetrated sedimentary rocks of Quaternary, Tertiary, and Cretaceous ages, in addition to basement rocks of unknown age. No pre-Cretaceous sediments were present in the well. In the Tertiary, reservoir quality sandstones were present in the Miocene and the Oligocene (Utsira and Skade Formations) and in the Eocene Grid Formation. The Grid sandstones were thinner than expected. No sandstones were developed in the Paleocene (Rogaland Group) at the well location. The carbonates in the Shetland Group were dated to be of Early Paleocene, Danian age. The lower Cretaceous sediments in well 16/1-4 are 4 m thick (1860 m -1864 m) and consist of clay stone/marls and immature sandstones with grains of igneous rocks similar to the basement rocks below. These sediments are dated to be of Early Aptian age and have been identified as the Sola Formation of the Cromer Knoll Group. The basement rocks consist mainly of brecciated igneous rocks. No hydrocarbon shows were observed in the Grid Formation sandstones. Gas-condensate was encountered in the upper part of the drilled basement section. Cores were cut in the Eocene Grid Formation and in the Hordaland Group shales between upper and lower Grid Formation (cores 1-3), in the Paleocene Balder- and Sele Formations (cores 4-6), and in basement rocks (core 7).The cores show well-developed clean sandstones in the Grid Formation. The boundary between the Balder- and the Sele Formations is present in core 4. The basement core generally consists of a mafic plutonic rock (gabbro/diorite) with intrusions of a felsic rock (syenite). The rocks are strongly brecciated. Petrologic analysis indicates that the plutonic igneous rocks are hydrothermally altered. FMT samples from1867.5 m and 1867.4 m in the Basement contained wet gas / condensate. Onshore geochemical analyses indicated low maturity for both the gas and the condensate components. The well was permanently abandoned as a minor gas/condensate discovery on 13 April 1993.TestingNo drill stem test was performed. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]330.002010.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11549.01559.0[m ]21561.01568.7[m ]31590.01607.6[m ]41695.01699.0[m ]51699.01706.0[m ]61708.01724.2[m ]71936.01941.7[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]68.0Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Core photos
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Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory357.5[m]SWCOD402.5[m]SWCOD454.5[m]SWCOD480.5[m]SWCOD536.5[m]SWCOD574.5[m]SWCOD613.5[m]SWCOD646.5[m]SWCOD650.0[m]DCOD660.0[m]DCOD670.0[m]DCOD673.5[m]SWCOD680.0[m]DCOD681.5[m]SWCOD685.5[m]SWCOD688.5[m]SWCOD690.0[m]DCOD697.5[m]SWCOD700.0[m]DCOD710.0[m]DCOD720.0[m]DCOD730.0[m]DCOD732.5[m]SWCOD740.0[m]DCOD750.0[m]DCOD760.0[m]DCOD763.5[m]SWCOD767.5[m]SWCOD768.5[m]SWCOD770.0[m]DCOD784.5[m]SWCOD828.5[m]SWCOD857.5[m]SWCOD860.0[m]DCOD870.0[m]DCOD880.0[m]DCOD882.5[m]SWCSTATOIL882.5[m]SWCOD890.0[m]DCOD900.0[m]DCOD906.5[m]SWCSTATOIL906.5[m]SWCOD910.0[m]DCOD912.5[m]SWCOD914.5[m]SWCSTATOIL914.5[m]SWCOD916.5[m]SWCOD920.0[m]DCOD930.0[m]DCOD940.0[m]DCOD950.0[m]DCOD960.0[m]DCOD970.0[m]DCOD980.0[m]DCOD981.5[m]SWCSTATOIL981.5[m]SWCOD990.0[m]DCOD1000.0[m]DCOD1003.5[m]SWCSTATOIL1003.5[m]SWCOD1010.0[m]DCOD1020.0[m]DCOD1030.0[m]DCOD1030.5[m]SWCSTATOIL1030.5[m]SWCOD1040.0[m]DCOD1043.5[m]SWCSTATOIL1043.5[m]SWCOD1050.0[m]DCOD1059.5[m]SWCSTATOIL1059.5[m]SWCOD1060.0[m]DCOD1070.0[m]DCOD1074.5[m]SWCSTATOIL1074.5[m]SWCOD1080.0[m]DCOD1088.5[m]SWCSTATOIL1088.5[m]SWCOD1090.0[m]DCOD1100.0[m]DCOD1104.5[m]SWCSTATOIL1104.5[m]SWCOD1110.0[m]DCOD1120.0[m]DCOD1130.0[m]DCOD1140.0[m]DCOD1144.5[m]SWCSTATOIL1150.0[m]DCOD1160.0[m]DCOD1170.0[m]DCOD1178.5[m]SWCSTATOIL1178.5[m]SWCOD1180.0[m]DCOD1183.5[m]SWCOD1187.5[m]SWCOD1190.0[m]DCOD1191.5[m]SWCSTATOIL1191.5[m]SWCOD1194.5[m]SWCOD1200.0[m]DCSTATOIL1200.0[m]DCOD1200.0[m]DCOD1210.0[m]DCOD1210.5[m]SWCSTATOIL1210.5[m]SWCOD1220.0[m]DCSTATOIL1220.0[m]DCOD1230.0[m]DCOD1234.5[m]SWCOD1239.5[m]SWCSTATOIL1240.0[m]DCOD1250.0[m]DCSTATOIL1260.0[m]DCOD1266.5[m]SWCSTATOIL1266.5[m]SWCOD1270.0[m]DCOD1280.0[m]DCSTATOIL1280.0[m]DCOD1290.0[m]DCOD1296.5[m]SWCSTATOIL1296.5[m]SWCOD1300.0[m]DCOD1310.0[m]DCSTATOIL1310.0[m]DCOD1320.0[m]DCOD1326.5[m]SWCSTATOIL1326.5[m]SWCOD1330.0[m]DCOD1340.0[m]DCSTATOIL1340.0[m]DCOD1350.0[m]DCOD1354.5[m]SWCSTATOIL1354.5[m]SWCOD1360.0[m]DCOD1370.0[m]DCSTATOIL1370.0[m]DCOD1380.0[m]DCOD1390.0[m]DCOD1390.5[m]SWCSTATOIL1390.5[m]SWCOD1400.0[m]DCOD1400.5[m]SWCSTATOIL1400.5[m]SWCOD1410.5[m]SWCSTATOIL1425.0[m]DCSTATOI1440.0[m]DCSTATOI1452.0[m]SWCSTATOI1462.0[m]SWCSTATOI1476.0[m]DCSTATOI1488.0[m]SWCSTATOI1494.0[m]SWCSTATOI1502.0[m]SWCSTATOI1512.0[m]DCSTATOI1521.0[m]DCSTATOI1532.0[m]SWCSTATOI1536.0[m]SWCSTATOI1545.0[m]DCSTATOI1552.7[m]CSTATOI1555.3[m]CSTATOI1561.6[m]CSTATOI1566.1[m]CSTATOI1568.5[m]CSTATOI1576.0[m]SWCSTATOI1583.0[m]SWCSTATOI1599.4[m]CSTATOI1617.0[m]DCSTATOI1626.0[m]SWCSTATOI1632.0[m]SWCSTATOI1641.0[m]DCSTATOI1650.0[m]DCSTATOI1659.0[m]DCSTATOI1668.0[m]DCSTATOI1678.0[m]SWCSTATOI1688.0[m]SWCSTATOI1695.0[m]CSTATOI1698.5[m]CSTATOI1702.4[m]CSTATOI1708.6[m]CSTATOI1712.4[m]CSTATOI1717.9[m]CSTATOI1724.1[m]CSTATOI1733.0[m]SWCSTATOI1740.0[m]SWCSTATOI1752.0[m]DCSTATOI1764.0[m]SWCSTATOI1772.0[m]SWCSTATOI1780.0[m]SWCSTATOI1797.0[m]SWCSTATOI1845.0[m]DCSTATOI1851.0[m]DCSTATOI1869.0[m]DCSTATOI1878.0[m]DCSTATOI1902.0[m]DCSTATOI1911.0[m]DCSTATOI1926.0[m]DCSTATOI -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit135768855918918117015391556158416261686168616961734181718341834186018601864 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.29 -
Geochemical information
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Documents – reported by the production licence (period for duty of secrecy expired)
Documents – reported by the production licence (period for duty of secrecy expired) Document nameDocument formatDocument size [MB]pdf21.43 -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]CBL VDL GR5001438CNL14382001COREGUN3571982DIFL ACL ZDL GR1002001FMT HP GR15441925FMT HP GR18671867HR-DIP GR14422000MWD - GR RES DIR3211549MWD - GR RES DIR15711590MWD - GR RES DIR16081695MWD - GR RES DIR17241936MWD - GR RES DIR19422010VSP5001000VSP6001986VSP10001985 -
Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30195.036195.00.00LOTINTERM.20314.026314.01.42LOTINTERM.13 3/81440.017 1/21440.01.93LOTOPEN HOLE2010.012 1/42010.00.00LOT -
Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3161.03WATER BASED3211.03WATER BASED3621.2018.0WATER BASED11001.2523.0WATER BASED14451.2528.0WATER BASED14501.2529.0WATER BASED15711.2523.0WATER BASED16281.2520.0WATER BASED16990.0020.0WATER BASED17081.2522.0WATER BASED17231.2521.0WATER BASED18191.2520.0WATER BASED18681.2523.0WATER BASED19141.2524.0WATER BASED19421.2523.0WATER BASED20101.2523.0WATER BASED