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.

States that petroleum and natural gas have been discovered in marine delta regions including the Kaveri (Cauvery) delta, linking this basin to hydrocarbon-bearing sedimentary systems.

A student could use this to argue Cauvery has the right depositional setting for organic-rich sediments (potential source rocks) and then consult geological maps/literature for shale units in the basin.

Lists Cauvery/Kaveri among locations where natural gas deposits have been found on the east coast of India.

Combine this with the concept that existing gas discoveries often coincide with basin source rocks—check if those discoveries are associated with shale-prone stratigraphy in Cauvery.

Notes exploratory wells have found oil and natural gas in the Kaveri/Cauvery basin on the east coast, confirming active hydrocarbon prospectivity there.

Use this to prioritize Cauvery when searching for reports on unconventional resources (shale gas) and for stratigraphic descriptions of the basin.

Mentions new petroleum reserves located in the Krishna-Godavari and Kaveri basins, indicating these basins are targets of recent exploration.

A student can infer that recent exploration may have generated basin studies and seismic/stratigraphic data useful to assess presence of shale units suitable for shale gas.

Describes that sedimentary sequences in some Indian regions include shales (alongside limestones and sandstones), showing shales are present in Indian basins.

Extend this pattern to ask whether similar shale-bearing sequences occur in the Cauvery basin by consulting basin stratigraphy maps or geological reports.

States that natural gas deposits occur in the Godavari and Krishna basins — establishes the region as a gas-bearing basin.

A student could note that a basin already producing natural gas is a plausible target for unconventional gas (shale) exploration and check geological maps for shale-bearing formations in the same basin.

Mentions new reserves of natural gas discovered in the Krishna-Godavari basin along the east coast — reinforces that the basin hosts recoverable gas.

Combine this with knowledge that shale gas requires organic-rich fine-grained rocks; then seek regional stratigraphic charts or reports indicating presence of such rocks in the KG basin.

Reiterates that new natural gas reserves have been discovered in the Krishna-Godavari basin — multiple sources confirm gas occurrences there.

Use this repeated confirmation to prioritize the KG basin when investigating whether the gas is sourced from conventional reservoirs or from shales (look up reservoir lithology or source rock studies).

Notes that Cuddapah formations in Andhra Pradesh (which underlie parts of Godavari lower valleys) are rich in shales — provides a direct indication that shale lithologies occur in the broader region.

A student could map the extent of Cuddapah/shale units relative to the KG basin and then consult petroleum literature to see if these shales are organic-rich/source rocks or targets for shale gas.

States that rocks from multiple periods (including Cretaceous, Tertiary) are preserved in parts of the Godavari and Krishna river basins — implies a complex sedimentary succession that can host hydrocarbons and shales.

Use knowledge that particular geologic periods often contain organic-rich shales; check regional stratigraphy for shale-bearing intervals from these periods in the KG basin.