Table 1 Criteria and their weights used in evaluating the potential of sedimentary basins for geological storage of CO2, following the methodology of Bachu (2003)
From: Potential for deep geological sequestration of CO2 in Switzerland: a first appraisal
Criterion | Classes (and relative scores in square brackets) | Weight | |||||
|---|---|---|---|---|---|---|---|
A | B | C | D | E | |||
1 | Tectonic setting | Convergent oceanic (episutural) [1] | Convergent intramontane (episutural) [3] | Divergent continental shelf [7] | Foredeep (perisutural) [15] | Cratonic [15] | 0.07 |
2 | Size | Small [1] | Medium [3] | Large [5] | Giant [9] | Â | 0.06 |
3 | Depth | Shallow (<1,500 m) [1] | Intermediate (1,500–3,500 m) [3] | Deep (>3,500 m) [5] |  |  | 0.07 |
4 | Geology | Extensively faulted and fractured [1] | Moderately faulted and fractured [3] | Limited faulting and fracturing, extensive shales [7] | Â | Â | 0.08 |
5 | Hydrogeology | Shallow, short flow systems or compaction flow [1] | Intermediate flow systems [3] | Regional, long-range flow systems; topography or erosional flow [7] | Â | Â | 0.08 |
6 | Geothermal | Warm basin [1] | Moderate [3] | Cold basin [7] | Â | Â | 0.10 |
7 | Hydrocarbon potential | None [1] | Small [3] | Medium [7] | Large [13] | Giant [21] | 0.06 |
8 | Exploration maturity | Unexplored [1] | Exploration [2] | Developing [4] | Mature [8] | Overmature [10] | 0.08 |
9 | Coals and CBM | None [1] | Deep (>800 m) [2] | Shallow (200–800 m) [5] |  |  | 0.04 |
10 | Salts | None [1] | Domes [2] | Beds [3] | Â | Â | 0.01 |
11 | On/offshore | Deep offshore [1] | Shallow offshore [4] | Onshore [10] | Â | Â | 0.10 |
12 | Climate | Arctic [1] | Sub-Arctic [2] | Desert [4] | Tropical [7] | Temperate [11] | 0.08 |
13 | Accessibility | Inaccessible [1] | Difficult [3] | Acceptable [6] | Easy [10] | Â | 0.03 |
14 | Infrastructure | None [1] | Minor [3] | Moderate [7] | Extensive [10] | Â | 0.05 |
15 | CO2 Sources | None [1] | Few [3] | Moderate [7] | Major [15] | Â | 0.09 |