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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, |
|
|
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 |
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 |
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 |
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.
