(ONGC) Proposes to Carryout Exploratory Drilling in PML Areas of South Assam Shelf (SAS) Block in Sarupathar Tehsil, Golaghat District, Assam
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Environmental Impact Assessment Studies for the Proposed Drilling of 15 Exploratory Wells in PML Areas of SAS Block in Sarupathar Tehsil, Golaghat District, Assam Executive Summary 1.0 EXECUTIVE SUMMARY Oil and Natural Gas Corporation Limited (ONGC) proposes to carryout exploratory drilling in PML areas of South Assam Shelf (SAS) block in Sarupathar tehsil, Golaghat district, Assam. ONGC has identified 15 well locations NL-1(KHBG), NL-2, NL-3, NL-4(NRAH), NL- 5(KHBE), NL-6 NL-7, NL-8, NL-9(KHBD), NL-10, NL-11, URAA, NL-12, NL-13 and NL-14 are included in present EIA study. It is proposed to drill 15 exploratory wells for the fulfillment of Minimum Work Program (MWP) and also to evaluate potential of the entire block. As per the Environment Impact Assessment (EIA) Notification dated 14th September, 2006 the proposed exploratory drilling of 15 wells project falls under ‘Category A’ of Activity Type 1(b). The EIA Report is prepared considering the TOR received from MoEF&CC vide letter. No. J-11011/111/2015-IA II (I) dated 6th July, 2015. The present project proposal deals with exploratory drilling of 15 wells in SAS block in Golaghat District, Assam. The exploratory drilling well locations have been identified in Golaghat district based on the basis of 2-D and 3-D seismic study. 1.1 Project Description 1.1.1 Location Details of the Project The block under study falls in PML areas of South Assam Shelf (SAS) area at Sarupathar tehsil, Golaghat district, Assam. Tentative well coordinates are given Table-1.1. The Topo map of the block area, depicting the salient features is shown in Figure-1. The details of environmental setting of the project block area are given below. There are three reserve forests block (Renga, Nambar and Dayang Reserve Forest) and Nambar Doigrung and Garampani Wild life sanctuary in the study area. The major water bodies in the project block area cover Rengma river, Harulangta river, Diyang river and Langtajan river, Kakajan river. The project block is connected through National Highways NH-39 and Chonganjan Railway station and Naojan Railway station to rest of the region; No archaeologically important places are present within block area as per Archaeological Survey of India (ASI) records; and The block area falls under Seismic Zone–V as per IS: 1893 (Part-1) 2002. VIMTA Labs Limited, Hyderabad ES-1 Environmental Impact Assessment Studies for the Proposed Drilling of 15 Exploratory Wells in PML Areas of SAS Block in Sarupathar Tehsil, Golaghat District, Assam Executive Summary TABLE-1.1 TENTATIVE WELL LOCATIONS To be drilled from Forest clearance Land Name of Sr.No existing wells or Latitude Longitude file no. District Tehsil Village location common point NAMBAR ML NL-1 KH-35, 3-AS B 014.2012- ONGC Land 1 26° 03' 14.72" 93° 55' 30.64” Golaghat Sarupathar Lachit gaon (KHBG) (KHAS) CP SHI 2 NL-2 KH-7, (KHF) CP 26° 02' 40.708" 93° 55' 40.324" 8-23/91-FC ONGC Land Golaghat Sarupathar Lachit gaon KH-9, NR-2 CP 8012- ONGC Land 3 NL-3 26° 03' 18.537" 93° 54' 37.439" Golaghat Sarupathar Tokshi 37/2000/RONE AS 4 NL-4 (NRAH) New Point 26° 03' 42.325" 93° 52' 42.549" - Forest Land Golaghat Sarupathar Pvito KH-30 (KHAT) CP 3-AS B 116/2008- ONGC Land 5 NL-5 (KHBE) 26° 05' 17.539" 93° 53' 20.996" Golaghat Sarupathar Sonowal SHI KHORAGHAT EXT.ML KH-23 8-12-112/2001/R ONGC Land 6 NL-6 26° 06' 18.760" 93° 57' 52.699" Golaghat Sarupathar 1 no. Azarguri (KHAF) CP ONE-AS KH-16 (KHAB) CP 8-12/11/97/RO- ONGC Land 7 NL-7 26° 05' 42.163" 93° 56' 22.399" Golaghat Sarupathar Haldibari NE-AS 8 NL-8 KH-13 (KHD) CP 26° 06' 13.243" 93° 55' 22.512" 8-23/91-FC ONGC Land Golaghat Sarupathar Nikihe NL-9 New Point - Forest Land 9 26° 06' 19.961" 93° 54' 20.513" Golaghat Sarupathar Dhupguri (KHBD) 10 NL-10 KH-4 (KGA) CP 26° 05’ 03.33” 93° 54’ 36.70” 8-562/89-FC ONGC Land Golaghat Sarupathar Dhupguri KH-27 (KHAQ) CP 8-12-21/2004/RO ONGC Land 11 NL-11 26° 07' 01.771" 93° 54' 15.008" Golaghat Sarupathar Sonali nagar NE-AS Golaghat Dist. PEL 12 URAA New Point 26° 09' 46.207" 93° 57' 12.736" - Forest Land Golaghat Sarupathar Lakhi Pathar 13 NL-12 URRA/CP 26° 09’ 49.331” 93° 57’ 17.530” - Forest Land Golaghat Sarupathar Lakhi Pathar Golaghat Ext. IIA PML New Point - Non-forest Baramukhia 14 NL-13 26° 16' 41.590" 93° 56' 40.078" Golaghat Sarupathar land New Point - Non-forest Langta 15 NL-14 26° 14' 54.876" 93° 56' 02.584" Golaghat Sarupathar land VIMTA Labs Limited, Hyderabad ES-2 Environmental Impact Assessment Studies for the Proposed Drilling of 15 Exploratory Wells in PML Areas of SAS Block in Sarupathar Tehsil, Golaghat District, Assam Executive Summary FIGURE-1 STUDY AREA MAP OF SAS BLOCK VIMTA Labs Limited, Hyderabad ES-3 Environmental Impact Assessment Studies for the Proposed Drilling of 15 Exploratory Wells in PML Areas of SAS Block in Sarupathar Tehsil, Golaghat District, Assam Executive Summary 1.1.2 Importance of the Proposed Project India is not among the major producers of crude oil, as it doesn’t have much oil reserves. Therefore, India generally depends on imports of crude oil from other countries. There is a heavy imbalance between oil production and consumption in India. The Indian government is encouraging exploration and production of oil and gas to a great extent. This would primarily allow India to tap its own resources there by reducing its import bill. Discovery of viable hydrocarbon reserves in the state can boost the state’s economic development to a great extent. The proposed exploration project is thus of immense significance for the state. 1.1.3 Details of Exploration Drilling Operation It is proposed to drill exploratory wells in the delineated area selected through seismic survey to identify and establish hydrocarbon potential. The proposed project intends to identify the presence of hydrocarbon prospects through exploratory drilling and to delineate and quantify hydrocarbon pools in discovered fields through appraisal drilling. The wells will be drilled upto a target depth of about 2000 to 3500 m by using water-based drilling mud only. 1.1.4 Infrastructure Requirement Project Cost: The estimated cost of the proposed exploratory & development drilling planned to be carried out is Rs. 600 Crores (approximately Rs. 40 crores per each well). Land Requirement: Minimum land required at each well site during drilling will be 125 m x 125 m, i.e., 1.56 ha. On an average, the land requirement at each well site, including site facilities and camp site is considered as 1.5-2.0 ha. The land will be acquired on a temporary basis and adequate compensation as per the guidelines of local administration will be provided. Power Requirement: The total power requirement at the drilling site will be 4290 KVA. The power requirement in the drilling site will be catered through Diesel Generator (DG) sets. The power requirement will be met by 3 Nos of 1430 KVA DG sets at drilling site. Stand by DG set arrangement of 1430 KVA at drilling site will be made. Water Requirement: Water is basically required for preparing drilling mud and for meeting domestic needs of the campsite. Typically, the water consumption for each well ranges from 25 m3/day for a short period of 4 to 5 months. However, the drilling and domestic water requirement would depend on the time required to drill the well, which is primarily dependent on the proposed depth. Man Power: The drill site construction would be done largely employing local labour. At each drill site construction, local employment will be generated for about 25 person/shift of 12 hrs. in two shifts. VIMTA Labs Limited, Hyderabad ES-4 Environmental Impact Assessment Studies for the Proposed Drilling of 15 Exploratory Wells in PML Areas of SAS Block in Sarupathar Tehsil, Golaghat District, Assam Executive Summary 1.2 Description of the Environment Environmental baseline data survey has been carried within the entire SAS block, during 15th January 2016 to 8th April 2016, covering winter season. 1.2.1 Land Use Studies The land use pattern of the total PML areas of South Assam Shelf (SAS) block has been studied by District Census Hand Books and satellite images. It is observed that the revenue forest land under the study area consists 373.64 ha (1.01) of the total geographic area. Altogether 31495.60 ha cultivable land (irrigated, un- irrigated and Land Under miscellaneous tree crops etc.) was observed in the study area. The irrigated land admeasures to about 648.00 ha in the study area which works out to be 1.75% of total study area. The un-irrigated land admeasures about 26979.50 ha and works out to about 72.83% of the total study area. Land uunder miscellaneous tree crops area admeasures to about 3868.10 ha and works out 10.44% of the total study area. 1.2.2 Soil Quality The soil samples were tested at 10 locations during winter season covering various land uses. It has been observed that the pH of the soil ranged from 7.1 – 8.2 indicating that is slightly alkaline to moderately alkaline in nature. The electrical conductivity was recorded as 113.3 µS/cm to 330.0 µS/cm.