JORSALFARE FM

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• General information

  General information

  Attribute	Value
  Lithostrat. unit The lithostratigraphic unit's official name.	JORSALFARE FM
  NPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.	74
  Level Indicates the lithostratigraphic unit's level. Legal values: GROUP, FORMATION, MEMBER.	FORMATION
  Lithostrat. unit, parent The parent lithostratigraphic unit's official name. See also level. Will be empty if Level = GROUP.	SHETLAND GP

• Level below

  Level below

  Lithostrat. unit

• Description

  Jorsalfare Formation
  
  Name

  Named after Sigurd "Jorsalfare" Magnusson, a Norwegian king (A.D. 1103-1130).

  Well type section

  Norwegian well 25/1-1 from 2997 m to 2711 m, coordinates N 59°53'17.40", E 02°04'42.70" (Fig 5.33) . One core (17 m) in the middle of the formation and another (4 m) at the base.

  Well reference sections

  Norwegian well 35/3-2 from 1665 m to 1520 m, coordinates N 61051'05.98", E 03°46'28.22" (Fig 5.34) . No cores. Norwegian well 24/9-1 from 3117 m to 2752 m, coordinates N 59°16'09.48", E 01°47'31.18" (Fig 5.35) . No cores.

  Thickness

  The formation is 286 m thick in the type well ( 25/1-1 ), 145 m in well 35/3-2 and 365 m in well 24/9-1 .

  Lithology

  The formation generally consists of mudstones interbedded with thin limestone beds. The mudstones are light to medium grey, often calcareous. The limestones are white to light grey, fine grained, occasionally sandy and dolomitic.

  Basal stratotype

  The lower boundary is defined by a decrease in gamma-ray intensity and an increase in velocity, reflecting an increase in calcareous content from the Kyrre Formation into the Jorsalfare Formation (Fig 5.33 , 5.34) . In the Tampen Spur area, however, the boundary may be difficult to identify due to small differences in calcareous content. The lower boundary may be unconformable above the Jurassic sequences (e.g. in the Gullfaks area).

  Characteristics of the upper boundary

  The upper boundary may be towards the Våle , Lista or Ty formations of the Rogaland Group . When the upper boundary is towards the shale of the Lista Formation it is usually characterised by an upward increase in gamma-ray intensity and a distinct drop in velocity (Fig 5.34) . When it is towards the Våle Formation it does not show the same distinct drop in velocity and increase in gamma-ray intensity, because the overlying lithology consists of limestones or calcareous mudstones (Fig 5.35) . Where the upper boundary is towards the Ty Formation it is identified as a change to sandstone (Fig 5.33) .

  Distribution

  The formation is present in the Viking Graben and on the Tampen Spur. Its boundaries towards the Jorsalfare Formation in the Viking Graben, the Hardråde Formation on the Horda Platform and the Tor Formation on the Utsira High are illustrated in (Fig 5.32ab) .
  The main characteristics that can be used to distinguish the three formations are:

  1. The Jorsalfare Formation contains shales with thin limestone beds which are usually no thicker than 5 m.
  2. The Tor Formation is dominated by limestones, and has a negligible shale content,
  3. The Hardråde Formation contains thick limestone beds (10-60 m), as well as shales, except in the Troll area where it is thin and may consist of only a single bed of limestone or marly limestone.

  Separation of these three formations may be difficult in transitional areas.

  Age

  Late Campanian to Maastrichtian.

  Depositiohal environment

  Open marine.

  Remarks

  The Jorsalfare Formation is time-equivalent with the Hardråde and Tor formations of the Shetland Group and also with the informal ”formation E” of Deegan & Scull (1977) (Fig 5.6) .

  Source

  • Isaksen, D. and Tonstad, K. (eds.) 1989: A revised Cretaceous and Tertiary lithostratigraphic nomenclature for the Norwegian North Sea. NPD-Bulletin No. 5, 59 pp.

• Wellbores penetrating

  Wellbores penetrating

  Wellbore name	Wellbore completion date	Top depth [m]	Bottom depth [m]
  15/3-1 S	06.07.1975	2800	3178
  15/3-3	09.08.1979	2764	3023
  15/3-4	30.03.1982	2763	3017
  15/3-5	13.05.1984	2803	3063
  15/3-6	05.01.1999	2725	2793
  15/3-7	01.09.2001	2696	3117
  15/3-8	11.04.2006	2792	3213
  15/3-9	13.08.2010	2792	3137
  15/3-11	09.08.2018	2805	3058
  15/3-12 A	03.03.2020	2813	3052
  15/3-12 S	20.01.2020	2801	3034
  15/9-11	23.12.1981	2557	2624
  24/6-1	25.08.1985	2802	2844
  24/9-1	03.07.1976	2752	3117
  24/9-3	15.04.1981	2836	3051
  24/9-5	26.01.1994	2828	2860
  24/12-2	21.01.1982	2683	2902
  24/12-6 S	20.12.2010	2761	3080
  25/1-1	22.07.1971	2711	2997
  25/1-6	18.03.1978	2799	2895
  25/1-7	26.05.1985	2710	2719
  25/1-7 R	14.02.1987	2710	2719
  25/1-7 R2	10.05.1988	2707	2716
  25/1-7 R3	16.04.1989	2707	2716
  25/1-7 R4	05.04.1990	2707	2716
  25/1-9	12.10.1986	2757	2807
  25/4-1	09.12.1972	2620	2721
  25/4-2	06.12.1973	2762	2775
  25/4-3	22.11.1974	2646	2714
  25/4-5	26.03.1981	2659	2960
  25/6-6 S	22.04.2019	2371	2445
  25/7-2	18.07.1990	2749	2925
  25/7-7	09.11.2019	2758	2903
  25/7-8 S	09.01.2020	2537	2647
  25/7-10	06.09.2022	2787	3048
  25/10-6 S	22.03.1996	2789	3069
  25/10-11	10.08.2011	2779	2869
  25/10-17 S	10.02.2023	2765	2937
  29/3-1	15.09.1986	2061	2267
  29/6-1	09.05.1982	2373	2678
  29/9-1	24.02.1984	2398	2633
  30/2-2	04.05.1985	2224	2533
  30/2-3	05.10.1992	2185	2438
  30/2-4 S	09.08.2008	2447	2834
  30/2-5 S	12.07.2020	2178	2468
  30/3-1	07.09.1979	2160	2472
  30/3-1 R	26.04.1982	2160	2472
  30/3-3	30.05.1983	2212	2429
  30/3-4	12.06.1985	2275	2491
  30/3-4 R	18.11.2001	2277	2493
  30/3-7 A	29.01.1998	3139	3692
  30/3-7 B	04.08.1998	3116	3437
  30/3-7 BR	17.11.2001	3116	3437
  30/3-7 S	12.12.1995	3139	3588
  30/3-9	01.07.2000	2228	2550
  30/3-10 S	29.04.2009	2213	2510
  30/3-11 S	09.09.2022	2227	2513
  30/4-1	14.05.1979	2262	3065
  30/4-3 S	09.10.2016	2418	2761
  30/5-1	29.07.1972	2304	2649
  30/5-2	21.12.1996	2470	2702
  30/5-3 A	30.05.2009	2584	3368
  30/5-3 S	12.04.2009	2326	2811
  30/6-1	22.09.1979	2194	2252
  30/6-7	24.08.1982	2290	2360
  30/6-17 A	18.03.1986	2235	2411
  30/6-17 R	04.02.1986	2181	2296
  30/6-18	23.11.1985	2400	2580
  30/6-25 S	06.01.1999	2336	2526
  30/6-27	30.10.2001	2405	2670
  30/6-28 S	29.03.2012	2231	2305
  30/6-30	18.11.2018	2311	3260
  30/6-31 S	25.04.2020	2313	2334
  30/6-31 S	25.04.2020	2334	2416
  30/7-2	09.11.1975	2371	2591
  30/7-3	25.10.1976	2542	2822
  30/7-7	01.07.1979	2538	2805
  30/8-1 S	01.03.1995	2472	2725
  30/8-1 SR	01.03.1996	2472	2725
  30/8-2	14.01.1996	2361	2405
  30/8-3	05.01.1998	2454	2649
  30/9-19	22.10.1998	2439	2652
  30/9-19 A	21.12.1998	2441	2659
  30/10-1	18.07.1973	2679	2834
  30/10-5	01.05.1975	2683	2829
  30/11-4	24.07.1984	2611	2870
  30/11-7	03.02.2009	2626	2901
  30/11-7 A	25.05.2009	2626	2912
  30/11-10	26.12.2014	2544	2824
  30/11-10 A	13.02.2015	2644	3024
  31/1-1	15.02.2008	1993	2040
  31/1-2 A	29.01.2021	2227	2444
  31/1-2 S	12.01.2021	2234	2404
  31/2-21 S	04.06.2014	2004	2059
  31/4-12	14.03.2005	1977	1995
  32/4-1	04.12.1996	846	849
  33/2-1	26.12.2014	2109	2326
  33/2-2 S	10.06.2015	1653	1952
  33/5-1	18.10.1979	1650	2054
  33/5-2	18.11.1981	1717	2085
  33/6-2	02.01.1997	1933	2251
  33/6-3 S	24.07.2012	1890	2159
  33/6-4	03.08.2012	1797	1845
  33/6-5 S	16.10.2021	1937	2264
  33/9-6	31.08.1976	1890	2100
  33/9-15	08.06.1992	1935	2120
  33/9-16	20.01.1993	1912	2187
  33/9-17	04.05.1994	1916	2165
  33/9-18	20.12.1994	1933	2195
  33/9-18 A	24.01.1995	1933	2230
  33/9-19 A	09.08.1996	1869	2219
  33/9-19 S	23.07.1996	1869	2237
  33/9-22 S	17.09.2017	1936	2201
  33/12-2	23.08.1974	1865	2049
  33/12-10 S	23.10.2014	2060	2305
  34/2-2 R	08.05.1981	1985	2193
  34/2-3	13.08.1981	1982	2194
  34/2-4	11.06.1985	2071	2470
  34/2-5 S	31.03.2018	2000	2198
  34/3-1 A	30.10.2008	2141	2315
  34/3-1 S	10.09.2008	2141	2314
  34/3-2 S	30.12.2009	2121	2303
  34/3-3 A	03.01.2012	2090	2267
  34/3-3 S	19.11.2011	2090	2267
  34/3-4 A	13.02.2015	2155	2327
  34/3-5	16.04.2015	2096	2282
  34/4-1	16.12.1979	1788	2025
  34/4-2	24.05.1980	1809	2127
  34/4-4	03.02.1983	1787	1943
  34/4-5	06.04.1984	1925	2145
  34/4-6	27.03.1986	1775	2056
  34/4-7	12.05.1987	1824	2076
  34/4-8	21.06.1994	1838	2070
  34/4-10	05.03.2000	1910	2195
  34/4-10 R	18.04.2000	1910	2195
  34/4-11	10.01.2010	1937	2235
  34/4-13 S	02.01.2011	2063	2400
  34/4-14 S	19.05.2015	1980	2193
  34/4-15 S	15.07.2020	1935	2222
  34/4-16 S	31.03.2021	1935	2221
  34/4-18 S	06.03.2022	1847	2258
  34/5-1 A	10.04.2010	2010	2241
  34/5-1 S	13.03.2010	2010	2235
  34/5-2 S	04.07.2018	2049	2307
  34/6-1 S	28.08.2002	2053	2300
  34/6-2 A	12.12.2012	2035	2273
  34/6-2 S	05.11.2012	2035	2273
  34/6-3 A	01.11.2014	2017	2245
  34/6-3 S	24.09.2014	2022	2249
  34/6-4	02.03.2016	2054	2241
  34/6-5 S	08.06.2021	2041	2247
  34/7-1	24.07.1984	1823	1933
  34/7-2	10.10.1984	1757	1842
  34/7-3	02.01.1985	1831	1940
  34/7-4	16.01.1985	1848	1998
  34/7-5	16.03.1985	1911	2090
  34/7-6	30.05.1985	1846	2120
  34/7-7	16.12.1985	1837	2139
  34/7-8	11.04.1986	1833	1928
  34/7-9	12.06.1986	1807	2025
  34/7-10	29.10.1986	1863	2145
  34/7-12	17.12.1987	1834	1997
  34/7-13	13.04.1988	1852	2097
  34/7-14	02.12.1989	1836	2007
  34/7-15 S	03.09.1990	1977	2246
  34/7-16	13.08.1990	1861	2150
  34/7-16 R	15.10.1990	1862	2151
  34/7-16 R2	05.07.1994	1861	2150
  34/7-17	07.04.1991	1924	2116
  34/7-17 A	04.05.1991	1924	2126
  34/7-18	17.09.1991	1807	2027
  34/7-19	27.12.1991	1870	2130
  34/7-19 R	12.07.1994	1877	2137
  34/7-20	27.08.1992	1881	2138
  34/7-21	11.12.1992	1900	2168
  34/7-21 A	12.02.1993	1900	2180
  34/7-22	01.10.1993	1810	1974
  34/7-23 A	20.05.1994	2283	2623
  34/7-23 S	03.04.1994	2283	2596
  34/7-24 S	24.03.1995	2065	2402
  34/7-25 S	14.09.1996	2331	2634
  34/7-26 A	26.02.1998	3072	3753
  34/7-26 S	13.09.1997	3340	3866
  34/7-26 SR	02.02.1998	3340	3866
  34/7-27	07.10.1998	1864	2170
  34/7-28	02.03.1998	1865	2109
  34/7-29 S	14.04.1998	1999	2260
  34/7-29 SR	17.03.1999	1998	2259
  34/7-30 SR	02.12.1999	1935	2389
  34/7-31	13.04.2001	1891	2160
  34/7-31 A	25.04.2001	1892	2175
  34/7-36 S	17.09.2014	2097	2395
  34/7-37 S	02.12.2020	1958	2169
  34/8-2	17.11.1986	1988	2218
  34/8-3	14.09.1988	2012	2300
  34/8-3 A	31.10.1988	2088	2395
  34/8-5	01.04.1991	2065	2322
  34/8-6	03.11.1991	2145	2340
  34/8-7	16.07.1992	2081	2320
  34/8-7 R	10.02.1993	2081	2320
  34/8-8	24.08.1992	1998	2232
  34/8-8 R	09.03.1993	1998	2231
  34/8-10 S	09.12.1993	1994	2220
  34/8-11	08.02.1994	2001	2220
  34/8-12 S	09.12.2001	2070	2382
  34/8-13 A	13.05.2009	2050	2277
  34/8-13 S	26.06.2009	2123	2577
  34/8-14 A	01.12.2008	2187	2376
  34/8-14 B	25.01.2009	2187	2376
  34/8-14 C	08.12.2008	2187	2376
  34/8-14 D	10.02.2009	2187	2374
  34/8-14 S	21.10.2008	2213	2375
  34/9-1 S	19.06.2022	2089	2332
  34/10-1	08.09.1978	1678	1718
  34/10-2	08.12.1978	2017	2625
  34/10-3	07.06.1979	1748	1827
  34/10-3 R	10.10.1987	1745	1824
  34/10-4	15.10.1979	1690	1745
  34/10-5	02.01.1980	1734	1857
  34/10-6	22.01.1980	1757	1990
  34/10-7	23.03.1980	1666	1750
  34/10-7 R	14.07.1983	1663	1747
  34/10-8	25.05.1980	1719	1821
  34/10-9	09.05.1980	1696	1767
  34/10-9 R	03.07.1980	1696	1767
  34/10-16	11.04.1983	2062	2355
  34/10-16 R	27.09.1983	2059	2352
  34/10-17	08.07.1983	1983	2295
  34/10-18	30.08.1983	1878	2107
  34/10-20	23.04.1984	2127	2408
  34/10-21	22.10.1984	2014	2313
  34/10-23	13.10.1985	2109	2465
  34/10-33	15.12.1988	2055	2350
  34/10-33 A	03.02.1989	2055	2350
  34/10-33 B	10.07.1989	2048	2340
  34/10-33 C	01.08.1989	2048	2340
  34/10-33 CR	27.04.1990	2048	2340
  34/10-36	13.07.1992	2061	2349
  34/10-42 S	19.09.1999	2196	2451
  34/10-54 A	18.04.2014	2081	2408
  34/10-54 S	11.02.2014	2081	2408
  34/10-55 S	26.03.2017	3045	3500
  34/11-1	25.10.1994	2125	2415
  34/11-2 S	17.05.1996	2033	2310
  34/11-4	14.04.1999	2117	2428
  34/11-5 S	03.07.2006	2372	2997
  34/11-6 S	26.01.2017	2624	2626
  34/12-1	30.04.2008	2007	2280
  35/1-1	18.07.2002	2153	2280
  35/1-2 S	19.12.2010	2155	2277
  35/3-1	26.10.1976	1580	1720
  35/3-2	26.10.1980	1520	1665
  35/3-4	06.06.1981	1470	1561
  35/3-5	31.03.1982	1420	1500
  35/3-6	02.04.2002	1356	1429
  35/3-7 S	01.10.2009	1520	1643
  35/4-1	24.05.1997	1912	2033
  35/4-3	17.05.2022	2063	2224
  35/6-2 S	04.04.2009	1355	1411
  35/6-3 S	25.08.2022	1273	1348
  35/7-1 S	15.08.2011	1991	2203
  35/8-1	24.01.1981	1893	2102
  35/8-2	21.05.1982	1941	2089
  35/8-3	15.10.1988	1792	1960
  35/8-4	10.08.1999	1810	1973
  35/8-5 S	20.07.2003	1725	1886
  35/8-6 A	14.05.2016	1930	2150
  35/8-6 S	22.04.2016	1934	2168
  35/9-1	07.05.1989	1229	1280
  35/9-1 R	27.07.1989	1229	1280
  35/9-2	03.04.1991	1305	1385
  35/9-3	11.11.1997	1247	1310
  35/9-5	07.02.2010	1464	1588
  35/9-6 S	07.12.2010	1677	1841
  35/9-7	14.04.2012	1767	1895
  35/9-8	11.04.2013	1738	1862
  35/9-9	18.11.2013	1350	1397
  35/9-10 A	16.01.2014	1994	2159
  35/9-10 S	26.11.2013	2035	2214
  35/9-11 A	21.05.2014	1704	1854
  35/9-11 S	15.04.2014	1704	1854
  35/9-12 S	26.12.2014	1635	1761
  35/9-13	20.01.2018	1390	1519
  35/9-14	02.03.2018	1382	1518
  35/9-14 A	29.03.2018	1382	1518
  35/9-16 A	25.04.2022	1234	1334
  35/9-16 S	06.04.2022	1234	1332
  35/10-1	16.01.1992	2005	2227
  35/10-2	22.08.1996	2106	2355
  35/10-3	14.07.1999	2199	2250
  35/10-4 A	12.11.2018	2023	2090
  35/10-4 S	10.10.2018	2023	2090
  35/10-7 A	27.12.2021	2191	2333
  35/10-7 S	11.12.2021	2150	2274
  35/10-8 S	08.04.2022	2033	2119
  35/11-2	04.12.1987	1950	2087
  35/11-4	29.12.1990	1835	1900
  35/11-8 S	11.05.1996	2124	2292
  35/11-9	01.05.1997	1973	2093
  35/11-10	23.06.1997	1858	1965
  35/11-10 A	14.07.1997	2004	2203
  35/11-11	22.05.1998	1914	2056
  35/11-12	14.05.2000	2019	2095
  35/11-13	28.05.2005	1938	2088
  35/11-14 S	07.12.2006	1950	2098
  35/11-15 S	28.06.2007	1947	2107
  35/11-16 S	18.03.2014	2134	2338
  35/11-17	01.05.2014	1904	1974
  35/11-18	27.09.2015	2019	2168
  35/11-18 A	16.12.2015	2020	2180
  35/11-20 A	07.08.2016	1945	2152
  35/11-20 B	15.09.2016	1943	2155
  35/11-20 S	19.06.2016	1943	2138
  35/11-21 A	17.10.2018	2055	2127
  35/11-21 S	05.09.2018	1990	2080
  35/11-22 S	02.02.2019	2069	2223
  35/11-23	06.11.2019	1980	2059
  35/11-23 A	21.11.2019	1978	2155
  35/11-23 A	21.11.2019	2155	2216
  35/11-24 A	28.08.2020	2089	2317
  35/11-24 B	16.09.2020	2099	2327
  35/11-24 S	09.08.2020	2064	2240
  35/11-25 A	04.06.2021	2086	2262
  35/11-25 S	14.05.2021	2043	2200
  35/12-1	24.04.1992	1434	1513
  35/12-2	15.07.2009	1770	1829
  35/12-3 S	16.02.2011	1747	1792
  35/12-4 A	17.07.2011	2037	2156
  35/12-4 S	26.06.2011	1999	2106
  35/12-5 S	19.06.2015	1583	1724
  35/12-6 A	30.06.2018	1648	1808
  35/12-6 S	14.06.2018	1649	2484
  35/12-7	25.07.2018	1783	1864
  36/1-1	14.06.1975	839	888
  36/1-2	27.10.1975	1315	1335
  36/1-3	25.03.2019	1202	1255
  36/1-4 S	30.01.2022	1311	1385
  36/4-1	01.10.1996	1253	1299
  36/7-1	07.05.1996	1281	1323
  36/7-3	06.01.2002	1249	1304
  36/7-4	26.09.2016	1258	1285
  6201/11-1	06.11.1987	2031	2170
  6201/11-2	11.03.1991	2042	2220
  6201/11-3	16.06.2012	2032	2120
  6201/11-3 R	20.10.2012	2032	2156
  6204/10-1	23.11.1995	1202	1250
  6204/10-2 A	04.12.1997	1285	1331
  6204/10-2 R	21.11.1997	1280	1327
  6204/11-3	14.09.2020	928	938
  6205/3-1	11.02.1990	1482	1573
  6205/3-1 R	30.11.1990	1482	1573
  6305/8-2	21.11.2014	3015	3047

• Wellbores with cores

  Wellbores with cores

  Wellbore name	Wellbore completion date	Core length [m]
  25/1-1	22.07.1971	21
  25/1-7	26.05.1985	10
  35/10-8 S	08.04.2022	17