Summary of Project

SUMMARY OF PROJECT Dumduma – Pengri Block OIL INDIA LIMITED (OIL), a Government of India Navaratna Enterprise, is currently engaged in carrying out exploration, development and transportation activities in its operational areas in Upper Assam, Arunachal Pradesh and Mizoram in the North Eastern part of India for petroleum exploration. OIL is also undertaking hydrocarbon exploration activities in few other Indian states and few overseas countries. Govt. of India and Assam has awarded Petroleum Mining Lease (PML) for exploration and development of oil & gas to Oil India Limited in Tinsukia districts. The area consists parts of Mechaki PML, Borhapjan PML, Dumduma PML and Digboi PML and is located towards the north-eastern part of OIL’s operational area of Upper Assam. Wells in Mechaki area have encountered depths of 5636 m and also encountered three prospective sand ranges within Langpar and Lakadong+Therria Formations. All these three sands were tested and commercial oil / gas was established. The area also includes parts of Borhapjan, Samdang, Dirak and Duarmara areas. The wells drilled within the periphery area are mainly for Palaeocene/Eocene {Lakadong+Therria (LK+TH) & Langpar}, Oligocene (Barail) and Miocene (Tipam) prospects. Out of these Palaeocene/Eocene prospects, oil discovery has been made from wells Borhapjan 1-5 and Samdang-3, but sustainable production could not be established. Hydrocarbon accumulations were also established from smaller structures of Samdang and Duarmara area from Tipam and Barail. Oil India Limited is presently producing crude oil and gas from the North Hapjan-Tinsukia-Baghjan, which is under Tinsukia district of Assam. In order to enhance further production activities in the said area OIL proposes to drill additional 27 locations along with construction of production facilities covering Borhapjan Dumduma PMLs under Tinsukia districts covering a project area of around 876 sq km. In the event of successful completion of drilling of the additional wells, it is expected to further augment the production of crude oil from the said block by around 700 Mbbl per year. Accordingly, the state of Assam will also be benefitted in terms of Royalty payment from Oil India Limited. The entire block area is demarcated on the basis of the geographical co- ordinates, and covers an area of about 876 sq km. Digboi is an important town of the area. Digboi oilfield is the oldest oilfield in Asia where 1002 wells have so far been drilled and produced from Tipam reservoir while it was under Burmah Oil Company (BOC). Well No. Digboi-1 was drilled in 1889 and still under production (not commercial). The project area covers agricultural land/ tea gardens/ Katha Reserve Forest (RF), Burihiding RF, Duarmara RF, Tarani RF, Dumduma RF, Nalani RF, Philobari RF, Takowani RF, Kakojan RF, Digboi RF, Bogapani RF and Uppere Dihing RF. No national park/wildlife sanctuary/eco-sensitive area are located within 10 Km radius. Almost 90% proposed locations are outside the reserved forest area. The Dumduma – Pengri block is defined by the geographical co-ordinates 95⁰35’00” - 95⁰53’00” N Longitude and 27⁰20’00” - 27⁰37’00” E Latitude and spreads over 924 sq km. Geomorphologically most of the area is within Brahmaputra river plain between the two large river systems viz., the Burhi Dihing towards south east and the Noa Dihing towards the northeast. At least two topographic levels are perceptible in the area as shown by the difference in elevation, degree of oxidation and degree of erosional dissection. The higher levels are formed by slightly oxidized older alluvium at elevation of 1-2 m above the alluvial plain and rarely inundated by floodwater. Traditionally the higher level is extensively used for tea cultivation while the intervening lower levels are used for kharif and rabi cultivation. Elevated elongated surfaces representing old point bars and natural levee within the alluvial plain are usually having settlements. Tinsukia District is bounded by Arunachal Pradesh in the southeast, by Dibrugarh District in the southwest and by Dhemaji District, which is separated from Tinsukia District by the mighty river Brahmaputra, in the north. The district Headquarters at Tinsukia is well connected by air, National Highway and railway. It is only 532 KM by road from the State Capital Guwahati, Assam. The nearest Airport is at Mohanbari, Dibrugarh, which is about 40 km from Tinsukia with connections to and from Guwahati, Kolkata and Delhi. The whole study area falls under territory of both the states of Assam and Arunachal Pradesh. As much as 1.1 % of the area falls under urban settlement, the only two townships occurring in the area are Digboi which is within the territory of Assam and Bardumsa which is under the administration of Arunachal Pradesh. There is no any major river flowing through the area. With area coverage of approximately 2.2%, the proportion of the wetland in the study area is higher than land occupied by rivers. Most of the wetlands occur in the active flood plain of the river Buri Dihing, which flows from north-east to south-west direction at the southern most flanks of the area. Date: 11.04.2018 (A.K.Acharya) Place: Duliajan General Manager (HSE)& Nodal Officer – (EC/FC/NBWL) Oil India Ltd .

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