MOLO FM

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• Generell informasjon

  Generell informasjon

  Attributt	Verdi
  Litostrat. enhet Den litostratigrafiske enhetens offisielle navn.	MOLO FM
  NPDID for litostrat. enhet Sokkeldirektoratets entydige nøkkel for litostratigrafiske enheter.	209
  Nivå Angir den litostratigrafiske enhetens nivå. Lovlige verdier: GROUP, FORMATION, MEMBER.	FORMATION
  Litostrat. enhet, forelder Den litostratigrafiske enhetens offisielle navn, refererer til forelder. Se også nivå. Vil være tom hvis Nivå = GROUP.	NORDLAND GP

• Nivå under

  Nivå under

  Litostrat. enhet

• Beskrivelse

  Molo Formation1)
  
  Name

  Molo is the Norwegian name for jetty.

  Well type section

  Well 6610/3-1 (Statoil) from approximately 349 m (the top is not sampled and logged in the well) to 555 m (Fig. A9) , in Eidvin et al. (2007)), coordinates 66°55’29.70’’N, 10°54’06.28’’E (Nordland Ridge, (Fig. A1) in Eidvin et al. (2007)).

  Well reference section

  Well 6407/9-5 (Shell) from 670 to 787 m ( (Fig. A1) coordinates 64°16’42.35’’N, 07°44’14.66’’E (Trøndelag Platform, (Fig. A1) in Eidvin et al. (2007)).

  Thickness

  A total thickness of 206 m in the type well is only sampled with five side wall cores (Fig. A9) . In the reference well a total thickness of 117 m is sampled with ditch cutting samples at ten meters interval (Fig. A1) . in Eidvin et al. (2007)). Some short vibro cores are sampled in the Nordland Ridge area (Fig. A1) . in Eidvin et al. (2007)). Close to its northern boundary (block 6610/2 and 6610/5) the unit increases to more than 500 m (Fig. A1) . in Eidvin et al., (2007)).

  Distribution

  The formation extends from the coast off Møre at approximately 63º30’N, along the inner Mid Norwegian shelf up to the Nordland Ridge and Lofoten area at approximately 67º40’ N (Fig. A1) . in Eidvin et al. (2007)).

  Lithology

  The lithology varies considerably throughout its distribution area. In most wells and boreholes from proximal parts, the unit consists mainly of red to yellow coloured sand. Some sections also contain well rounded, rust-tinted pebbles. In some wells glauconitic sand and mica-rich sand are recorded. In the Draugen Field (Trøndelag Platform), where the distal part has been investigated, the unit contains glauconitic sand, silt and clay.

  Basal boundary

  In the type well the lower boundary is recognized by an abrupt change from greyish claystone of the Brygge Formation to grey mica-rich sand of the Molo Formation. The boundary is marked by a strong negative spike at approximately 555 m on the gamma log (Fig. A9) . in Eidvin et al. (2007)). In the reference well the lower boundary is recognised by an abrupt change from greyish claystone of the Brygge Formation to dark (nearly black) glauconitic sand of the Molo Formation. The boundary is further marked by an increase in the gamma ray response and a decrease in velocity (Fig. A1) . in Eidvin et al. (2007)).

  Characteristics of the upper boundary

  The upper boundary is not sampled and logged in the type well and it is only recognised on seismic lines. In the reference well the upper boundary is recognised by a marked decrease in velocity and a slight decrease in the gamma ray response into the overlying glacio-marine diamicton (Fig. A1) . in Eidvin et al. (2007)).

  Age

  Late Miocene – Early Pliocene.

  Depositional environment

  The formation was deposited in a coastal shallow marine to prograding deltaic environment, probably formed in a wave-dominated environment with extensive long-shore drift.

  Remarks

  It is only in wells from the distal part, including the reference well, that it is possible to date the Molo Formation by means of biostratigraphical and strontium isotope analyses. In wells from the proximal part, including the type well, only reworked fossils are recorded. Most of the sediments in this part are probably reworked from other formations including the Brygge and Tare formations. The Molo Formation has previously informally been called the “Delta” by Bugge et al. (1976), IKU Bedrock Unit IX by Bugge et al. (1984) and Rokoengen et al. (1988, 1995), the “Frøyrygg formation” by Askvik & Rokoengen (1985) and informally introduced as the “Molo formation” by Gustavson & Bugge (1995).

  Source

  • Eidvin, T., Bugge, T. & Smelror, M., 2007: The Molo Formation, deposited by coastal progradation on the inner Mid-Norwegian continental shelf, coeval with the Kai Formation to the west and the Utsira Formation in the North Sea. Norwegian Journal of Geology, Vol. 87, pp. 75-142. Available from the internet

  Footnotes

  • 1) In the NPD-factpages the Molo Formation has only been used for the wells analysed by Eidvin et al. (2007).

• Brønnbaner som penetrerer

  Brønnbaner som penetrerer

  Brønnbane navn	Dato for boreslutt	Topp dyp [m]	Bunn dyp [m]
  6306/6-2	17.11.2009	786	849
  6307/1-1 S	28.12.2018	308	537
  6407/9-1	07.09.1984	762	825
  6407/9-2	02.02.1985	807	860
  6407/9-5	13.11.1985	670	787
  6510/2-1	10.10.1997	441	480
  6510/2-1 R	21.12.1997	441	480
  6610/3-1	17.02.1993	349	555
  6610/3-1 R	11.12.1993	349	555
  6610/3-1 R2	07.10.1996	351	557
  6610/7-1	19.06.1983	890	952

• Brønnbaner med kjerner

  Brønnbaner med kjerner

  Brønnbane navn	Dato for boreslutt	Kjernelengde [m]