Empirical relation between carbonate porosity and thermal maturity: An approach to regional porosity prediction
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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.
Suggested Citation
Schmoker, J.W., 1984, Empirical relation between carbonate porosity and thermal maturity: An approach to regional porosity prediction: American Association of Petroleum Geologists Bulletin, v. 68, no. 11, p. 1697-1703, https://doi.org/10.1306/AD46197B-16F7-11D7-8645000102C1865D.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Empirical relation between carbonate porosity and thermal maturity: An approach to regional porosity prediction |
| Series title | American Association of Petroleum Geologists Bulletin |
| DOI | 10.1306/AD46197B-16F7-11D7-8645000102C1865D |
| Volume | 68 |
| Issue | 11 |
| Year Published | 1984 |
| Language | English |
| Publisher | American Association of Petroleum Geologists |
| Description | 7 p. |
| First page | 1697 |
| Last page | 1703 |