Appendix 4 Comparison of saline aquifer CO2 storage potential of India, Pakistan and Bangladesh with that of the European sector

In the IEAGHG R&D Programme study of the CO2 storage in the European Sector (Wildenborg et al. 2005) the CO2 storage capacity in deep saline aquifers where the reservoir thickness and distribution was unknown was estimated as follows:

It was assumed:

  1. That one or more deep saline aquifers suitable for CO2 storage were present over 50% of the basin.
  2. 0.2 x 106 tonnes CO2 could be stored per km2 of the area above.

Multiplying the above gives a crude estimate of the CO2 storage potential. This methodology assumes that the storage capacity of a sedimentary basin depends on its area rather than its geology – a gross oversimplification. When this methodology is applied to those basins in India, Pakistan and Bangladesh that have good and fair saline aquifer CO2 storage potential, it produces the results shown in Table 1.

Table A4. 1 Estimated saline aquifer CO2 storage capacity using European Sector methodology

Country/Basin name Area km2 Estimated saline aquifer CO2 storage capacity 106 tonnes
Assam Basin 56000 5600
Assam-Arakan fold belt 68000 6800
Mahanadi Basin* 86000 8600
Krishna-Godavari Basin* 40000 4000
Cauvery Basin* 60000 6000
Mumbai Basin* 120000 12000
Cambay Basin 56000 5600
Barmer Basin 10000 1000
Kutch Basin* 71000 7100
Jaisalmer Basin 30000 3000
Bikaner-Nagaur Basin 36000 3600
Subtotal India   63300
Indus Basin   0
Balochistan Basin 300000 30000
Subtotal Pakistan   30000
Bengal Basin (E Bangladesh)** 200000 20000
Subtotal Bangladesh   20000
Total   113300

*Includes offshore areas to 200 m isobath, **including Chittagong Hill Tracts

For comparison, the total saline aquifer CO2 storage capacity of the European sector (Iceland, Norway, Sweden, Finland, Denmark, Ireland, UK, Netherlands, Belgium, Luxembourg, Germany, France, Austria, Switzerland, Portugal, Spain, Italy and Greece) is estimated to be 150 Gt CO2 (Wildenborg et al. 2005).