ABSTRACT:

The continental shelf of India, measuring about 380.000 Sq.kms upto 200 m water depth has been an area of intense exploration activity from 1974. The offshore areas are to be fully explored as hardly 3- percent of prognosticated resources have been established. In addition. reserves in deep sea basins between 200 to 3000 m are estimated to be around 4 billion tonnes which needs improved technique and technology for speedy development to meet the demand of 77 MMT/A by 1995 and 101 MMT/A by 2000. Bulk of the production will be from offshore fields. India is currently 70 per cent self-sufficient in oil. To accelerate offshore exploration, six groups of international companies have been awarded exploration rights. For improved recovery of oil. reservoirs are being developed by water-injection pressure-maintenance. " horizontal and infill wells. This paper highlights the accomplishment of ONGC. present status and promising offshore India outlook for the 1990s in fascinating oil business.

OFFSHORE EXPLORATION ACTIVITIES

The continental shelf of India covers an area of about 380.000 Sq. Kms upto 200 m water depth and western offshore basins about 67 percent of it, (Fig. I). The experimental and regional reconnaissance seismic surveys undertaken as early as 196Z in Kutch, Saurashtra, Bombay, Kerala-Konkan in Arabian sea: Cauvery. Krishna-Godavari and West Bengal Offshore resulted in the identification of number of structural features. The first offshore wild-cat drilled by indigeneous efforts in the country was on Aliabet structure. at the mouth of the river Narmada and 50 Km west of Ankleshwar oil field in" Gujarat State yielded oil from Lower Miocene sand which encouraged the offshore exploration(Fig.Z). Detailed seismic surveys in 1912-73. led to the delineation of Bombay High. The entire western offshore area came into prominance after the oil strike in India" s first giant field - Bombay High in 1974.

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