The pair of states which has most of the petroleum deposits

The correct answer is Assam and Gujarat . Key Points Oil production in India comes primarily from three onshore states, Assam, Gujarat, and Rajasthan , which together account for more than 96 per cent of oil from onshore fields , and from the aged offshore Mumbai High Field. Minerals Location Petroleum Digboi - Assam Bombay High - Maharastra Ankleshwar - Gujarat Naharkatiya - Assam Kalol - Gujarat Assam: Oldest oil-producing state in India The main oil-bearing strata extend for a distance of 320 km in upper Assam along the Brahmaputra valley. Oilfields of Assam are relatively inaccessible and are distantly located from the main consuming areas. Oil from Assam is, therefore, refined mostly in the refineries located at Digboi, Guwahati, Bongaigaon, Barauni and Gujrat: Ankleshwar, Khambhat or Lunej, Ahmedabad and Kalol, Nawgam, Kosamba, Kathana, Barkol, Mahesana, and Sanand are important oilfields of this region. Ankleshwar: Oil from this field is sent to refineries at Trombay and Koyali. Hence, option 2 is the correct answer. Additional Information Oil fields in India: 1 lakh sq km or 42% of India is covered with sedimentary rocks. 10 lakh sq km form marine basins of Mesozoic and Tertiary times. The total continental shelf of probable oil-bearing rocks amounts to 2 lakh sq km. The total sedimentary area including both onshore and offshore comprises 27 basins. Mumbai High, the Khambhat Gulf, and the Assam are the most productive areas Oil fields: Brahmaputra valley of northeast India. Barmer area of Rajasthan. Gujarat coast in western India. Cauvery on-shore basin in Tamil Nadu. Andhra Pradesh has both on-shore and offshore oil reserves.