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Cretaceous

Jurassic

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Compiled by: Jacques LeBlanc (2022), Stratigraphic Lexicon: The Sedimentary Formations of The Republic of Niger, Africa. Colnes Publishing (Tallin, Estonia), 365 pp. For more information see "About"

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Madama Formation

Madama Fm

Period:

Cretaceous

Age Interval:

Upper Cretaceous (Maastrichtian) (6, 7b)

Province:
East Niger Rift Basin - Termit Sub-basin, East Niger Rift Basin - Ténéré Sub-basin

Type Locality and Naming

Subsurface in Termit Sub-Basin

References: Lai et al., 2018; Lai et al., 2019; Ahmed et al., 2020;

Synonym: Madama reservoir; Madama sandstone. Not to confuse with the Carboniferous “Grès/Série de Madama” described below.

Equivalent(s): This sub-surface Formation correlates with surface formations of the lower part of the Termit Fm, the lower part of the Galhama Fm, the lower part of the Bilma Fm, and the lower part of the Emi-Bao Fm.

Lithology and Thickness

Massive sandstones with a thin layer of muddy sandstones and coal seam. Well data revealed that it has top reservoir quality with 25%-35% porosity and suitable reservoir property in its upper 100-200 m thick sandstone. Its lower sequence of alternating sandstone and shale has some oil shows. The Madama Formation only has one third-order sequence, namely, MSQ1 (Figure). Thickness: Exceeds 300 m in the Termit Sub-Basin and can reach 1500 m in the Ténéré Sub-Basin.

[Figure. Generalized stratigraphic column and sequence division of the Madama Formation of the Termit Sub-Basin (Source: Lai et al., 2018).]

Lithology Pattern:

Sandstone

Relationships and Distribution

Lower contact

Underlying unit is the Yogou Fm

Upper contact

Overlying unit is the Sokor 1 Fm

Regional extent

Seen only in the subsurface of Termit and Ténéré Sub-basins

GeoJSON

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Fossils

Age

Upper Cretaceous (Maastrichtian)

Age Span:

Beginning stage:

Maastrichtian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

72.17

Ending stage:

Maastrichtian

Fraction up in the ending stage:

1.0

Ending date (Ma):

66.04

Depositional setting

The facies is a stack of braided delta channels associated with a continental fluvial/alluvial deposit.

Depositional pattern:

Additional Information

Compiler:

Jacques LeBlanc (2022), Stratigraphic Lexicon: The Sedimentary Formations of The Republic of Niger, Africa. Colnes Publishing (Tallin, Estonia), 365 pp. https://doi.org/10.47909/978-9916-9760-6-7 (or via https://sites.google.com/site/leblancjacques)