25/3-1
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Generell informasjon
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Brønnhistorie
GeneralWell 25/3-1 was designed to drill a narrow NNW-SSE trending horst structure on the Utsira High. The main objective for the well was to test the hydrocarbon potential of the Middle Jurassic Vestland Group sandstones, and the Lower Jurassic Statfjord Formation sandstones. The site survey indicated two high amplitude events at two different levels west (135 m MSL) and northwest (180 m MSL) of the proposed well location that could indicate shallow gas.Operations and resultsWildcat well 25/3-1 was spudded with the semi-submersible installation West Vanguard on 4 July 1989and drilled to TD at 3922 m in Late Triassic sediments of the Statfjord Formation. To assure safe operation in possible shallow gas zones, the interval (198 to 720 m) was drilled as a 17 1/2 " pilot hole before opening to 26" hole. Drilling went on without any serious problems. No shallow gas was encountered.The Vestland Group reservoir was reached 65 m deeper than expected. The reservoir was thinner than expected, and of relatively bad quality and water bearing. The Statfjord Formation was reached 128 m deeper than expected, and also water bearing. Very weak shows were recorded in two samples from 2165 m and 2170 m in the Balder Formation; otherwise no shows were recorded while drilling. Geochemical source rock screening found very good Type II kerogen (oil) source potential in the Draupne Formation and good Type II-III kerogen (gas + light oil) source potential in the Heather shales and the Vestland Group coals and shales. The well has reached early maturity probably at ca 2700 m, so the Draupne shale is in the very early oil window.Two cores were cut. Core no 1 was cut from 3112 to 3130 m in the Vestland Group, and no 2 from 3858 to 3876 m in the Statfjord Formation. The RFT tool was run, but due to obstruction in the hole representative pressure points were not obtained. No fluid sample was taken.The well was permanently abandoned on 5 September 1989 as a dry hole.TestingNo drill stem test was performed. -
Borekaks i Sokkeldirektoratet
Borekaks i Sokkeldirektoratet Borekaks tilgjengelig for prøvetaking?YESBorekaks i Sokkeldirektoratet Borekaksprøve, topp dybde [m]Borekaksprøve, bunn dybde [m]200.003922.00 -
Borekjerner i Sokkeldirektoratet
Borekjerner i Sokkeldirektoratet Kjerneprøve nummerKjerneprøve - topp dybdeKjerneprøve - bunn dybdeKjerneprøve dybde - enhet13112.03129.9[m ]23858.03873.9[m ]Borekjerner i Sokkeldirektoratet Total kjerneprøve lengde [m]33.7Borekjerner i Sokkeldirektoratet Kjerner tilgjengelig for prøvetaking?YES -
Kjernebilder
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Palynologiske preparater i Sokkeldirektoratet
Palynologiske preparater i Sokkeldirektoratet Prøve dybdeDybde enhetPrøve typeLaboratorie1680.0[m]DCRRI1700.0[m]DCRRI1720.0[m]DCRRI1740.0[m]DCRRI1760.0[m]DCRRI1780.0[m]DCRRI1800.0[m]DCRRI1820.0[m]DCRRI1840.0[m]DCRRI1860.0[m]DCRRI1880.0[m]DCRRI1900.0[m]DCRRI1920.0[m]DCRRI1940.0[m]DCRRI1960.0[m]DCRRI1980.0[m]DCRRI2000.0[m]DCRRI2020.0[m]DCRRI2040.0[m]DCRRI2060.0[m]DCRRI2080.0[m]DCRRI2100.0[m]DCRRI2120.0[m]DCRRI2140.0[m]DCRRI2160.0[m]DCRRI2180.0[m]DCRRI2200.0[m]DCRRI2220.0[m]DCRRI2240.0[m]DCRRI2260.0[m]DCRRI2280.0[m]DCRRI2310.0[m]DCRRI2330.0[m]DCRRI2350.0[m]DCRRI2370.0[m]DCRRI2390.0[m]DCRRI2410.0[m]DCRRI2430.0[m]DCRRI3112.0[m]CRRI3116.0[m]CRRI3119.0[m]CRRI3126.0[m]CRRI3128.0[m]CRRI3325.0[m]DCRRI3340.0[m]DCRRI -
Litostratigrafi
Litostratigrafi Topp Dyb [mMD RKB]Litostrat. enhet13610362127215921592253231424142470283630163016304331073107312033343870 -
Spleisede logger
Spleisede logger Dokument navnDokument formatDokumentstørrelse [MB]pdf0.62 -
Geokjemisk informasjon
Geokjemisk informasjon Dokument navnDokument formatDokumentstørrelse [MB]pdf2.60 -
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter
Dokumenter – eldre Sokkeldirektoratets WDSS rapporter og andre relaterte dokumenter Dokument navnDokument formatDokumentstørrelse [MB]pdf0.24pdf0.22 -
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk)
Dokumenter – rapportert av utvinningstillatelsen (frigitt ihht til regelverk) Dokument navnDokument formatDokumentstørrelse [MB]pdf15.41 -
Logger
Logger Type loggTopp dyp for logg [m]Bunn dyp for logg [m]CBL VDL GR17502990CBL VDL GR CCL13601984CDM AP19982970CDM AP29973918CDM AP31003918DIL DDBHC GR AMS SP7031998DIL DDBHC GR AMS SP19842995DIL GR SLS MSFL AMS29933921FMS GR29933922LDL CNL NGS AMS29933922LDL GR AMS7031998LDL GR AMS19842995MSD19982970MWD1993922NGT RATIOS29933922SHDT GR AMS19842993STL GR20032985VELOCITY7073921 -
Foringsrør og formasjonsstyrketester
Foringsrør og formasjonsstyrketester Type utforingUtforing diam.
[tommer]Utforing dybde
[m]Brønnbane diam.
[tommer]Brønnbane dyp
[m]LOT/FIT slam eqv.
[g/cm3]Type formasjonstestCONDUCTOR30197.036198.00.00LOTINTERM.20703.026720.01.33LOTINTERM.13 3/81983.017 1/21998.01.66LOTINTERM.9 5/82991.012 1/43005.01.93LOTOPEN HOLE3922.08 1/23922.00.00LOT -
Boreslam
Boreslam Dybde MD [m]Egenvekt, slam [g/cm3]Viskositet, slam [mPa.s]Flytegrense [Pa]Type slamDato, måling9091.0916.09.8WATER BASED14.07.198912431.1319.010.7WATER BASED14.07.198918401.2022.011.7WATER BASED17.07.198918581.2126.012.7WATER BASED18.07.198919481.2023.012.2WATER BASED19.07.198919981.2022.012.2WATER BASED20.07.198930711.2526.07.3WATER BASED10.08.198931181.2531.05.8WATER BASED11.08.198931981.2534.012.7WATER BASED14.08.198932911.2532.012.7WATER BASED14.08.198933531.2530.011.7WATER BASED14.08.198933951.2528.011.7WATER BASED15.08.198934291.3031.011.7WATER BASED22.08.198934561.2630.011.7WATER BASED16.08.198934911.3031.013.7WATER BASED17.08.198935691.3031.012.7WATER BASED22.08.198937191.3533.014.7WATER BASED22.08.198937741.3534.013.7WATER BASED22.08.198938581.3534.011.7WATER BASED24.08.198938581.3534.011.7WATER BASED24.08.198938711.4537.012.7WATER BASED25.08.1989