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World Energy Outlook 2007

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Oil Supply<br />

Resources and Reserves<br />

India's proven reserves of oil amounted to 5.6 billion barrels at the end of<br />

2006, equal to 0.4% of world reserves. 1 Official government data put "proved<br />

and indicated" reserves on 1 April 2006 at 756 million tonnes or about<br />

5.4 billion barrels. Reserves are almost equally shared between onshore and<br />

offshore (Table 17.1). But the average size of the offshore fields is much bigger.<br />

Onshore reserves are fragmented in small to medium-size fields. Despite the<br />

uncertainty related to the level of production so far from a few fields, we<br />

estimate that more than 50% of the ultimately recoverable reserves from<br />

identified fields have been produced, excluding the volumes in fields yet to be<br />

discovered.<br />

Table 17.1: India's Oil Reserves, End-2005<br />

Onshore Offshore On/Offshore Total<br />

Number of fields 242 91 3 336<br />

Proven and probable reserves<br />

(million barrels) 2 650 2 525 180 5 355<br />

Cumulative production to date (million barrels) 2 603 3 414 167 6 184<br />

Sources: IHS <strong>Energy</strong> databases; IEA estimates.<br />

The reserves are mainly located in five sedimentary basins: Mumbai (38%),<br />

Cambay (20%) and Barmer (15%) in the north-west, close to the border<br />

with Pakistan, Assam shelf (18%) in the north-east and Krishna-Godavari<br />

(7%) in the south. The Assam shelf, Barmer and Cambay basins are almost<br />

entirely onshore while the Mumbai and the Krishna-Godavari basins are<br />

exclusively offshore. Since 1997, 97 oilfields have been discovered, mainly<br />

located in the Assam shelf, Cambay and Barmer basins. These fields<br />

represent almost 30% of all fields ever discovered in India, highlighting the<br />

effort deployed in exploration under the new upstream licensing regime<br />

(see Oil Production below). However, the 1 320 million barrels of reserves<br />

that were added represent only 13% of the oil discovered before 1997, as<br />

recent discoveries have generally been much smaller. We estimate that<br />

about 43% of the undiscovered volumes of oil that were estimated to exist<br />

in 1995 by the United States Geological Survey in 2000 have already been<br />

discovered.<br />

1. Oil and Gas Journal, 18 December 2006.<br />

490 <strong>World</strong> <strong>Energy</strong> <strong>Outlook</strong> <strong>2007</strong> - INDIA’S ENERGY PROSPECTS

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