Which petroleum production centre is not located in the Barmer - Sanchore Basin?

The Barmer-Sanchore Basin is a specific onland rift basin centred on Barmer district (and the adjoining Sanchore area of Jalore district), developed by Cairn Oil & Gas (Vedanta) under block RJ-ON-90/1 since the 2004 Mangala discovery. Its discovered fields cluster around the hub fields Mangala, Bhagyam and Aishwariya, together with named satellite fields such as Shakti, Kameshwari, Raageshwari, Saraswati, Vijaya, Guda and Tukaram. Rajasthan's other petroleum fields - such as those of the separate Jaisalmer Basin operated by Oil India Limited, which include Tanot, Dandewala, Manhera Tibba and Sadewala - lie further northwest in Jaisalmer district and belong to a geologically distinct basin.

Checking each named centre against this basin membership: Shakti, Kameshwari and Tukaram are all discovered fields officially listed within the Barmer-Sanchore Basin by the Rajasthan Directorate of Petroleum (Tukaram was found in the deeper Dharvi Dungar sands of the Raageshwari-Tukaram area of the same RJ-ON-90/1 block). Sadewala, however, is located in Jaisalmer district as part of the separate Jaisalmer Basin, not the Barmer-Sanchore Basin.

• Shakti - a Barmer-Sanchore satellite field near the Mangala-Bhagyam-Aishwariya hub; easy to mistake as outside the basin if this membership is forgotten.

• Kameshwari - another Barmer-Sanchore satellite field (with West-block extensions); mistaken for the same reason.

• Tukaram - a Barmer-Sanchore discovery in the Raageshwari-Tukaram area's deeper Dharvi Dungar horizon; a later, less publicised find, but still within the basin.

• Sadewala - part of the separate Jaisalmer Basin (Jaisalmer district), confirming it as the centre genuinely outside the Barmer-Sanchore Basin.

So Sadewala is the correct answer - the petroleum production centre not located in the Barmer-Sanchore Basin.