Schmoker (1984) reported that variations with depth of carbonate porosity, θ, can be expressed as θ = a(TTI)b, where a and b are parameters estimated by curve fitting for specific data populations and TTI is Lopatin’s (1971) time-temperature index of thermal maturity. This relationship is a consequence of the individual mathematical relationships of θ and TTI with depth, and in no way implies a genetic relationship between the two. To understand why this relationship generally exists, we examined the case of burial at constant subsidence and deposition rate.

In this case, for any given depth such as...

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