Control over CO2 Trapping Mechanism
1. If rock minerals gets dissolved, then,
to what extent,
formation permeability
would get reduced?
And, what would be its
associated time-scale?
2. Formation water with low salinities,
leading to an enhanced CO2 dissolution
is good or bad - in the long run?
3. With time, how do we know
the fraction of injected CO2
(a) that would get dissolved (first leading to acidification, and then, more chemical reactions to follow); and
(b) that would remain in gaseous phase (which could easily escape)?
4. With differing time-scales and
with different chemical reactions;
following CO2 injection,
(leaving aside Mineral Trapping)
do we really have control over
(a) Structural Trapping?
(b) Stratigraphic Trapping?
(c) Local capillary Trapping?
(d) Capillary (or Residual Trapping)?
(e) Solubility Trapping?
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