Petrophysical analysis of early cretaceous Saar ca

Authors: Mohammed Hail Hakimi Saddam A AlSufi Shaheem AlHamadi Shadi A AlSharabi

Publish Date: 2015/06/05

Volume: 8, Issue: 12, Pages: 11307-11319

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Abstract

The Saar Formation the late Early Cretaceous in age is a secondary reservoir rock containing low amounts of proven oil in the Sharyoof oilfield Masila Basin The lithofacies of the Saar Formation at Sharyoof oilfield is mainly composed of dolomite and dolomitic limestone with limestone intercalations reflecting a marine setting Petrophysical properties and some petrographic characteristics were used to evaluate the reservoir characteristics and quality of the Saar carbonates Generally the Saar carbonates have poor to good reservoir quality The porosity ranges from 6 to 21  and permeability varies from 001 to 500 md The pore types are secondary pores in form vugs and fractures as identified under microscope The good reservoir quality of the Saar carbonates is characterized by a relatively high secondary porosity and permeability Therefore the dolomite and dolomitic limestone intervals of the Saar Formation have good reservoir quality and reveal promising reservoir characteristics which should be taken into consideration during future development of the Sharyoof oilfield The Saar carbonates have hydrocarbon saturation exceeding 70  with low oil movability indicating high residual oil saturation and the production is mainly water with limited oilThis study was performed from the coauthor’s BSc project and carried out at Taiz University Geology Department The authors are grateful to Petroleum Exploration and Production Authority PEPA Yemen for supplying the data and samples to complete this study The authors also would like to sincerely thank an Associate Editor Dr Santanu Banerjee and anonymous reviewers for their careful and useful comments that improved the revised manuscript

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