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The siliciclastic rocks of Paleoproterozoic Supracrustal Kolhan Group are more or less persistently widespread over much of West Singhbhum, Jharkhand. They confined by four separated shallow intracratonic basins, the area in between, being mainly occupied by lower lava, tuffaceous rocks, granites and banded iron formation belonging to the older Iron-Ore Group. It exhibits an extensive development of conglomerate and sandstone with the eastern passive margin of the Singhbhum Granite which progressively grades upward to limestone and shale towards western margin. The occurrence of...

Oil and natural gas were formed from the remains of prehistoric plant and animals. The oil and gas that formed in the source rock deep within the earth moved upward through tiny, connected pore spaces in the rocks. Reservoirs are not underground "lakes" of oil; reservoirs are made up of porous and permeable rocks that can hold significant amounts of oil and gas within their pore spaces. Most reservoirs contain oil, gas, and water. Technological innovation makes it easier to find new deposits of oil and gas and to get more oil or gas from each reservoir that is discovered. The reservoir...