Pakistan Stratigraphy · stratigraphy.pk
Goru Formation
https://stratigraphy.pk/formation/goru-formation
Goru Formation
Early Cretaceous (Aptian-Albian)
Cretaceous in the time scale →Stratigraphic position
Band colour = period; texture = dominant rock type. Lines between bands mark the contact type. True scale makes height ∝ recorded thickness; hatched = thickness not recorded. Ages approximate, for ordering.
This unit (highlighted) within its province column; faded ends continue above and below. Line style marks the contact type.
A thick Cretaceous limestone-and-shale; its Lower Goru sands are one of Pakistan's top gas reservoirs.
Marine sequence with excellent petroleum reservoir characteristics. Shows transition from restricted to open marine conditions.
Significance. A thick Cretaceous limestone-shale-siltstone unit (Lower and Upper Goru) overlying the Sembar source rock; the Lower Goru is among Pakistan's most important gas reservoirs.
- Lithology
- Interbedded limestone, shale and siltstone; lower part shalier (thin-bedded light limestone with splintery grey-olive shale), upper part thin-bedded porcellaneous limestone; grades up into the Parh Limestone.
- Thickness
- 536 m (type locality)
- Type locality
- Goru village
- Environment
- marine
- Introduced by
- Williams (1959)
- Economic importance
- The Lower Goru sands are a major gas reservoir of the Lower and Central Indus Basin (e.g. Sui, Mari, Sawan, Miano).
Fossils
Provinces
References
- Malkani, M.S. & Mahmood, Z. (2017). Stratigraphy of Pakistan. Geological Survey of Pakistan, Memoir Vol. 24.
- Kazmi, A.H. & Jan, M.Q. (1997). Geology and Tectonics of Pakistan. Graphic Publishers, Karachi.
- Iqbal, M. et al. (2017). Hydrocarbon exploration perspective in Middle Jurassic-Early Cretaceous reservoirs in the Sulaiman Foldbelt, Pakistan. (ResearchGate).
Reviewer confidence: high
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