In which of the following regions of India are shale gas resources found? 1. Cambay Basin 2. Cauvery Basin 3. Krishna-Godavari Basin Select the correct answer using the code given below.

States that India's major gas reserves are supplemented by finds in the Cambay basin, showing the basin contains natural gas occurrences.

A student could combine this with the basic fact that shale gas is a form of natural gas occurring in sedimentary basins to consider Cambay as a candidate for shale gas and then look for reports of organic-rich shale units there.

Repeated NCERT statement that Cambay basin supplements major gas reserves, reinforcing that the basin hosts gas deposits.

Use this corroboration plus knowledge that gas in basins can occur in conventional reservoirs or in shales to motivate checking Cambay’s reservoir types and shale presence.

Classifies the Cambay Basin as a 'Deep Sedimentary basin', a geological setting where sedimentary rocks (including shales) commonly occur.

A student could take this geological classification and, using a basic geological map or stratigraphic summaries, search for shale formations or source rocks in the Cambay sedimentary sequence that might host shale gas.

Notes oilfields in the Cambay-Luni/Ankleshwar region and that the oil belongs to the Eocene period, indicating known hydrocarbon-bearing strata and specific stratigraphy in the basin.

A student could use the Eocene age note to check whether Eocene or nearby-age shales in the Cambay succession are organic‑rich and potential shale-gas source rocks.

Records discovery of oil and gas in the Gulf of Cambay (Khambat), confirming exploration has occurred in Cambay-related areas.

Knowing exploration occurred, a student could look for exploration reports or technical papers from those surveys that specify whether gas is conventional or in low-permeability (shale) reservoirs.