On 28 December 2017, OIL India Ltd (OIL) announced the gas discovery in its Chandmari South 5 exploration well (presumably an outpost well of Chandmari South field). OIL is understood to have encountered multiple sands in the Eocene Narpuh and Lakadong & Therria formations. Production testing results indicated that gas is produced at a rate of 0.05 MMcm/d (1.77 MMcf/d) from a 10 m sand interval within the Lakadong & Therria formations at a depth of 4,290 m. The Chandmari South 5 well is believed to be located in the Dum-Duma Block B ML in Assam Shelf. Â  OIL is understood to have spudded the Chandmari South 5 in late 2016 and was carrying out the production testing operations in Q2 FY 2017-18. Chandmari South 5 is believed to have been targeting a TD around 4,500 m.  The Chandmari South field lies directly to the south of the Barekuri field (formerly Chandmari North) and approximately 5 km to the north of the producing Makum field. Chandmari South 1, drilled in a period between October 2001 to March 2002, with TD 4,011 m, was the gas discovery well of the Chandmari South field. Later OIL drilled Chandmari South 2 in 2007 and Chandmari South 4 in 2012-2013. Chandmari South 2 had a TD of around 4,000 m and discovered heavy high pour point oil from the Tipam Formation. Chandmari South 4 was listed as a new pool discovery after testing across the interval 3,915 - 3,920 m in the Lakadong & Therria formations flowed oil at a rate of 75.5 b/d and gas at 1.34 MMcf/d. Â  Dum-Duma Block B ML comprises around 317 sq km area. OIL holds 100% interest in the Dum-Duma Block B ML, which was awarded on 26 November 1989 for a period of 20 years. The licence was subsequently renewed for a further 20 years, with effect from 26 November 2009.Â  Â  Â 
India (Assam Shelf) (It's a petroleum rights. Please summarize by yourself). In IHS database: Dum-Duma Block B ML op. by OIL INDIA (100.0%) to be check.