The Cambay basin is located in the north-western margin of the Indian Peninsula.
It is an intracratonic rift graben between the Saurashtra uplift and the Aravali ranges extending roughly in a N-S alignment, as a long and narrow depression from North Gujarat to the Gulf of Cambay.
This tectonic alignment continues southward along offshore Bombay to Kerela and Laccadives.
The Cambay basin is further traversed by a number of transverse faults trending roughly East-West, which have divided the basin into five tectonic blocks, namely the Patan-Sanchor, Ahmedabad–Mehshana, Cambay-Tarapur, Jambusar-Broach and Narmada blocks.
The Cambay basin is the most explored basin in India with a drilling density of about 390 wells/10,000 sqKm.
The principal source rock in the area is the Cambay shale with a thickness of the order of 700 m or more. The total organic content of the Cambay shale is in general greater than 1% in the depth range of 1700 m to 3300 m.