SEDIMENTARY BASINS OF INDIA

• Total 26 sedimentary basins are present

• Out of 7 are petroliferous ( Category-I)

• Constitutes area of 3.14 million squre km

CLASSIFICATION

They are classified into 4 categories

1) CATEGORY-I

Basins with established commercial production.

• Cambay Basin

• Bombay offshore Basin: Reservoir rock - Limestone

• Rajastan Basin

• Krishna Godaveri basin

• Cauvery Basin

• Assam Sheft Basin

• Assam- Akaran Fold belt Basin

CAMBAY BASIN

• Failed rift basin :Aulacogen

• Source rock: Cambay shale (Lower Eocene)

• Reservoir rock : Kalol and Ankleshwar fm.

BOMBAY OFFSHORE BASIN (Western)

• Intracratonic rift basin

• Doubly plunging Antiformal-Anticline

• Host rock: Limestone

• Source rock: Panna formation

• Reservoir rock: Limestone

RAJASTAN BASIN

• Peripheral foreland basin

  2 Sub-basins

JAISALMER BASIN

• Source rock : Baisakhi shales

• Reservoir rock: Jaisalmer formation

BIKANER-NAGAUR BASIN

• Source rock: Bilara shale (Dolomitic)

• Reservoir rock: Jodhpur sandstone

KRISHNA-GODAVERI BASIN

• Rift basin

• Source rock: Kommugudem formation

• Reservoir rock: Mandapeta sandstone

CAUVERY BASIN

• Intracratonic rift basin

• Source rock: Sattapadi shale

• Reservoir rock: Bhubangiri, Nallinam formation

ASSAM-AKARAN BASIN (North Eastern)

• Source rock: Barail and Kopili shale

• Reservoir rock: Tipam sandstone (miocene) , Barail fm(Oligocene)

• Oil fields: DNMRL

  1) Digboi

  2) Nahorkatiya

  3) Moran

  4) Rudrasagar

  5) Lakwa

GUJURAT OIL FIELDS (Western)

• Oil fields : ACKN

  1) Ankleshwar

  2) Cambay

  3) Kolal

  4) Nawagam