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→Predicting leakage
==Predicting leakage==
==Predicting leakage==
Only gas accumulations can be destroyed by diffusive leakage. For most seal lithologies, loss by diffusion is very slow; so most gas accumulations are preserved for tens to hundreds of millions of years. Rates of loss have been modeled (e.g., <ref name=ch11r26 />), but data necessary to quantitatively predict accumulation preservation at a particular prospect are difficult to acquire.
Only gas accumulations can be destroyed by diffusive leakage. For most seal lithologies, loss by diffusion is very slow; so most gas accumulations are preserved for tens to hundreds of millions of years. Rates of loss have been modeled,<ref name=ch11r26 /> but data necessary to quantitatively predict accumulation preservation at a particular prospect are difficult to acquire.
Diffusive leakage is favored by high temperature, high pressure, and a thin, porous seal. Older accumulations are more likely to be destroyed by this process, and late Cenozoic accumulations are not likely to be destroyed by this process.
Diffusive leakage is favored by high temperature, high pressure, and a thin, porous seal. Older accumulations are more likely to be destroyed by this process, and late Cenozoic accumulations are not likely to be destroyed by this process.