MOLO FM
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General information
General information Attribute Value Lithostrat. unit The lithostratigraphic unit's official name.MOLO FMNPDID lithostrat. unit Norwegian Offshore Directorate's unique id for lithostratigraphic units.209Level Indicates the lithostratigraphic unit's level. Legal values: GROUP, FORMATION, MEMBER.FORMATIONLithostrat. unit, parent The parent lithostratigraphic unit's official name. See also level. Will be empty if Level = GROUP. -
Level below
Level below Lithostrat. unit -
Description
Molo Formation1)
NameMolo is the Norwegian name for jetty.Well type sectionWell 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 sectionWell 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)).ThicknessA 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)).DistributionThe 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)).LithologyThe 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 boundaryIn 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 boundaryThe 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)).AgeLate Miocene – Early Pliocene.Depositional environmentThe formation was deposited in a coastal shallow marine to prograding deltaic environment, probably formed in a wave-dominated environment with extensive long-shore drift.RemarksIt 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).
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Wellbores penetrating
Wellbores penetrating 12.07.202235856317.11.200978684928.12.201830853707.09.198476282502.02.198580786013.11.198567078710.10.199744148021.12.199744148017.02.199334955511.12.199334955507.10.199635155719.06.1983890952 -
Wellbores with cores