About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 68 (1984)

Issue: 11. (November)

First Page: 1697

Last Page: 1703

Title: Empirical Relation Between Carbonate Porosity and Thermal Maturity: An Approach to Regional Porosity Prediction

Author(s): James W. Schmoker (2)

Article Type: Meeting abstract


Data indicate that porosity loss in subsurface carbonate rocks can be empirically represented by the power function, ^Thgr = a (TTI)b, where ^Thgr is regional porosity, TTI is Lopatin's time-temperature index of thermal maturity, the exponent, b, equals approximately -0.372, and the multiplier, a, is constant for a given data population but varies by an order of magnitude overall.

Implications include the following.

1. The decrease of carbonate porosity by burial diagenesis is a maturation process depending exponentially on temperature and linearly on time.

2. The exponent, b, is essentially independent of the rock matrix, and may reflect rate-limiting processes of diffusive transport.

3. The multiplying coefficient, a, incorporates the net effect on porosity of all depositional and diagenetic parameters.

Within constraints, carbonate-porosity prediction appears possible on a regional measurement scale as a function of thermal maturity. Estimation of carbonate porosity at the time of hydrocarbon generation, migration, or trapping also appears possible.

Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Protected Document: $10
Internal PDF Document: $14
Open PDF Document: $24

AAPG Member?

Please login with your Member username and password.

Members of AAPG receive access to the full AAPG Bulletin Archives as part of their membership. For more information, contact the AAPG Membership Department at [email protected].