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Karbi Anglong is emerging as a promising hydrocarbon exploration region within the Assam-Arakan Basin, with ongoing geological and seismic studies indicating significant petroleum and natural gas potential.

Hydrocarbon exploration in Karbi Anglong is part of India’s efforts to enhance domestic energy security by exploring frontier sedimentary basins. Although commercial production has not yet started, extensive exploration has identified several promising geological structures.

Key Highlights

  • Karbi Anglong lies within the Assam-Arakan Basin, one of India’s most productive petroleum basins, covering nearly 1.16 lakh sq. km and containing over 100 oil and gas fields.
  • The exploration is spearheaded by Oil India Limited (OIL) in collaboration with Oil and Natural Gas Corporation (ONGC), Gas Authority of India Limited (GAIL) and East West Petroleum.
  • The Directorate General of Hydrocarbons (DGH) awarded Exploration Block AA-ONN-2010/2 (around 400 sq. km) for detailed exploration of conventional and unconventional hydrocarbon resources.
  • Seismic surveys conducted since 2006 have identified potential hydrocarbon-bearing structures in Manja, Lumbajong, Bokajan, Lumding-Dillai, and areas bordering Dima Hasao and the Naga Fold Belt.
  • The region contains sedimentary formations such as the Kopili, Barail, and Tipam Formations, which are known petroleum source and reservoir rocks.

Challenges

  • Dense forests, hilly terrain, and poor road connectivity increase exploration costs.
  • Environmental clearances are crucial due to ecologically sensitive forests and wildlife corridors.
  • Community participation and cooperation with the Karbi Anglong Autonomous Council are essential for land access and project implementation.
  • Security and logistical challenges have previously delayed seismic surveys.

 

Assam-Arakan Basin

  • Assam-Arakan Basin is one of the principal petroliferous basins of India. 
  • It is situated in the northeastern part of India categorized as category-I basin. 
  • Tectonically, the Assam-Arakan Basin is classified as a foreland basin, formed by the flexural downwarping of the lithosphere resulting from the collision of the Indian Plate with the Eurasian and Burmese plates.
  • The basin covers an area of 1,16,000 Sq.Km. 
  • Major tectonic elements of the basin are:   
    • Assam Shelf 
    • Naga Schuppen belt   
    • Assam-Arakan Fold belt 
  • The chief oil fields of Assam are Digboi, Nahorkathiya, Moran, Rudrasagar and Lakwa. 
  • The Upper Assam Basin has long been one of the major onshore petroleum producing regions of India with reservoir rocks being mainly of Tertiary age.   
  • The Upper Assam Shelf of the Assam–Arakan Basin lies mostly below the alluvial cover of the mighty Brahmaputra River and its tributaries. 

Tectonic History of the Basin

  • The Assam-Arakan sedimentary Basin is a shelf–slope–basinal system. 
  • The shelf part of the basin spreads over the Brahmaputra valley and the Dhansiri valley, the latter lying between the Mikir hills and the Naga foothills. 
  • From the Digboi, the shelf runs westward to the southern slope of the Shillong plateau. The shelf-to-basinal slope, i.e., the hinge zone lies below the Naga Schuppen belt. 
  • The basinal (geosynclinal) part is occupied by the Cachar, Tripura, Mizoram and Manipur fold belts.
  • The shelf part rests on the Precambrian granitic basement, whereas the basinal part lies on transitional to oceanic crust. 
  • The area within the Upper Assam shelf, having high petroleum potential, measures approximately 56000 sq km and contains about 7000m thick sediments of mostly Tertiary period. 
  • The area in the basinal part with moderate to high hydrocarbon potential measures about 60,000 sq km and contains more than 10,000m thick sediments of mostly Tertiary period.

Exam Hook (Prelims)

Consider the following statements regarding hydrocarbon exploration in Karbi Anglong:

  1. Karbi Anglong lies within the Assam-Arakan Basin.
  2. The Directorate General of Hydrocarbons regulates exploration blocks under the Hydrocarbon Exploration and Licensing Policy.
  3. The Kopili, Barail and Tipam formations are associated with petroleum-bearing sedimentary rocks.

Which of the statements given above are correct?

(a) 1, 2 and 3 

 

One-Line Wrap

With its favourable geology and strategic location in the Assam-Arakan Basin, Karbi Anglong is emerging as a key frontier for India’s future hydrocarbon exploration and energy security.

 

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