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Conventional Hydrocarbons

India has 26 sedimentary basins covering an area of 3.36 million square kilometres. The sedimentary basins of India, onland and offshore up to the 400m isobath, have an aerial extent of about 2.04 million sq. km. In the deepwater beyond the 400m isobath, the sedimentary area has been estimated to be about 1.32 million square kilometres.The Indian sedimentary basins have been broadly divided into three categories based on their degree of prospectivity as presently known which is as under:

CATEGORIES OF INDIAN SEDIMENTARY BASINS

Type of Basins

Area (Sq. Km.)

Hydrocarbons Prospectivity

Basins/ Region

Category I (7 Basins)

9,98,325

Established commercial production

Cambay, Assam Shelf, Mumbai offshore, Krishna Godavari, Cauvery, Assam Arakan Fold Belt and Rajasthan

Category II (5 Basins)

7,80,974

Known accumulation of hydrocarbons but no commercial production as yet

Kutch, Mahanadi-NEC & Andaman-Nicobar, Vindhyan, Saurashtra

Category III (14 Basins)

15,86,150

Indicated hydrocarbon shows that are considered geologically prospectivity.

Himalayan Foreland, Ganga, Kerala-Konkan-Lakshadweep, Bengal, Karewa, Spiti-Zanskar, Satpura-South RewaDamodar, Narmada, DecanSyneclise, Bhima-Kaladgi,
Cuddapah, Pranhita-Godavari, Bastar, Chhattisgarh

Total

33,65,449

 

 

Crude oil and natural gas production in the country is from 7 sedimentary basins, under Category I, there are 5 basins in Category II that have established petroleum resources but are yet to produce commercially. The distribution of total Indian sedimentary area of 3.36 million square kilometre under different categories is presented as under:

INDIAN SEDIMENTARY AREA

The last hydrocarbon resources assessment exercise was carried out approximately two decades ago (1995-96). During the course of implementation of pre-NELP and NELP rounds and other exploration and production activities, substantial geoscientific data have been generated. New oil and gas fields have also been discovered by utilizing improved geological understanding and new technology. With the increase in exploration spread and quantum jump in availability of geo-scientific data generated under NELP, there was a need to revisit the hydrocarbon resource assessment of all sedimentary basins of India. A Multi Organization Team (MOT) comprising of representatives of ONGC, OIL and DGH has carried out estimation of hydrocarbon resource potential in the country. The exercise of re-assessment of hydrocarbon resources for all the sedimentary basins in the country was completed in 2017. The prognosticated conventional hydrocarbon resources in 26 sedimentary basins of the country are of the order of 41.87 billion tonnes (oil and oil equivalent of gas), which is about 49% increase as compared to earlier estimates of 28.08 billion tonnes. The basin-wise details are as under:

Basin Category

No.

Basin Name

Prognosticated Resource (MMTOE)

 

Estimate 1995-96

Estimate (2017)

Category I
(Basins with reseves being produced and Exploited)

1

Assam Arakan Fold Belt

1860

1632.8

2

Assam Shelf

3180

6001.2

3

Cambay

2050

2585.6

4

Cauvery

700

1964.4

5

Krishna Godavari

1130

9554.5

6

Mumbai Offshore

9190

9646

7

Rajasthan

380

4126

Category I Total

18490

35510.5

Category II
(Basins with contingent resources to be developed and monetized)

8

Andaman

180

371.4

9

Kutch

760

898.4

10

Mahanadi

145

650.6

11

Saurashtra

280

1325.2

12

Vindhyan

Not Studied

632.5

Category II Total

1365

3878.1

Category III
(Basins with only prospective resources to be explored and discovered)

13

Bastar

Not Studied

1.3

14

Bengal

190

828.3

15

Bhima-Kaladgi

Not Studied

3.2

16

Chhattisgarh

Not Studied

25

17

Cuddapah

Not Studied

5.1

18

Deccan

Not Studied

11

19

Ganga

230

128.4

20

Himalayan Foreland

150

44.4

21

Karewa

Not Studied

4

22

Kerala Konakan

660

1244.6

23

Narmada

Not Studied

18

24

Pranhita Godavari

Not Studied

95.4

25

Satpura-S.Rewa-Damodar

Not Studied

63

26

Spiti-Zanskar

Not Studied

11.1

Category III Total

1230

2482.8

Deep Water Areas

7000

Deep water area estimated basin-wise & resources added to respective basins

Total (MMTOE)

28085

41871.4

As on 1st April, 2018 in-place hydrocarbon volume of 10680 million tonnes of oil and oil equivalent gas has been established through exploration by ONGC, OIL and Private/JV companies. About 74% of resources are under "yet to discover" category. Out of 10,680 MMT of oil and oil equivalent gas of in-place volumes, the ultimate reserves which can be produced are about 4,095 MMT of oil and oil equivalent gas. The balance recoverable reserves are of the order of 1,812 MMT of oil and oil equivalent gas. 

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