Hydrocarbon reservoir quality of carbonate-evaporite Permo-Triassic formations in Iran

What is it about?

Permo–Triassic (P–T) successions in Iran are known as one of the most extensive carbonate–evaporite sequences in the world, holding prolific hydrocarbon accumulations, such as the gas fields in the Zagros Basin. This study addresses the impact of paleoenvironmental changes across the P–T extinction boundary, variations in eustatic level and diagenesis on the carbonate reservoir quality of the Permo–Triassic Upper Dalan and Kangan formations in the Lavan Gas Field (offshore Zagros). A total of eight lithofacies have been defined and interpreted, representing the shallower parts (inner ramp to shoal) of a carbonate homoclinal ramp. The diagenetic features show the mixing influence of marine, meteoric and burial processes, with prevalence of multistage dolomitization and late meteoric-related imprints.

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Why is it important?

This study provides a better understanding on reservoir quality prediction of the Permo–Triassic Upper Dalan and Kangan formations in the Lavan Gas Field (offshore Zagros). The effects of eustatic fluctuations and diagenesis in controlling porosity-permeability evolution in this reservoir may be compared as analogue with similar settings elsewhere.