{{Use Indian English, date=May 2022 The Jaisalmer basin is one of the parts of the Rajasthan basin in northwestern India. This basin is geographically shared with Pakistan to the west. Jaisalmer basin ages back to

Mesozoic The Mesozoic Era ( ), also called the Age of Reptiles, the Age of Conifers, and colloquially as the Age of the Dinosaurs is the second-to-last era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceo ...

and

Cenozoic The Cenozoic ( ; ) is Earth's current geological era, representing the last 66million years of Earth's history. It is characterised by the dominance of mammals, birds and flowering plants, a cooling and drying climate, and the current configura ...

. It is a pericratonic basin while the other two parts of Rajasthan basin; Bikaner-Nagaur and Barmer-Sanchor are intracratonic basins.

Petroleum in the Jaisalmer sub basin

Within the Jaisalmer petroleum has been explored by various oil companies including Focus Energy, Oil & Natural Gas Corporation (ONGC) and Oil India Limited in the Lower Goru, Pariwar formations of Jaisalmer sub Basin.

Clastic Clastic rocks are composed of fragments, or clasts, of pre-existing minerals and rock. A clast is a fragment of geological detritus,Essentials of Geology, 3rd Ed, Stephen Marshak, p. G-3 chunks, and smaller grains of rock broken off other rocks ...

sandstones serve as the reservoirs. these include the Baisakhi-Bedesir, Pariwar, Goru, Sanu and Khuiala formations. Traps in this area are restricted to fault related closures and

unconformity An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous. In general, the older layer was exposed to erosion for an interval o ...

related traps. Other important formations are Sembar / Bedesir - Baisakhi Shales, Karampur/Badhaura Formation Shales, Bilara Shales and Dolomites.

References

Department of Mines and Geology website
Geology of Rajasthan