Deep Gas Potential in
The National Energy Technology Laboratory estimates that
there is a huge natural gas resource (>1000 tef)
in
The first task can be accomplished by combining detailed velocity analyses with hydrocarbon maturation modeling. The second task can be accomplished by diagenetic modeling based on burial history, thermal evolution, and reaction kinetics.
Work on deep gas accumulations has shown that significant commercial porosity/permeability can occur at depths >20,000 ft. These deep high porosity/permeability domains result from the convergence of critical determinative elements.
The convergence of these critical elements can be modeled with the following reactions:
1) CaS04 + CH4 ® CaCO3 + H2S + H2O CaS04 + 3H2S + CO2 ® CaC03 + 4So + 3H2O
2) Fe+3 + 0.5So + 1.5H2S ® FeS2 + 3H+ Fe+2 + So + H2S ® FeS2 + 2H+
3) CaC03 + 2H+ ® Ca+2 + H2O + CO2
The Mesozoic and Paleozoic stratigraphic
sections, plus structural settings in