Petrophysical Evaluation and Sequence Stratigraphy of Upper Surmeh (Arab) Formation in Reshadat Field (Persian Gulf)

Abstract The upper Jurassic, Upper Surmeh (Arab) Formation in Block R in Iranian territorial Reshadat field in the Persian Gulf , subdivided into the A, A1, B, C and D members, is overlain by Hith formation and underlain by the Darb and Diyab formations. The Arab members consist of a thick sequence of carbonates and evaporites which is deposited in Shallow marine. The typical Parasequences consist of shoal Grainstone, representing Transgressive System Tracts, that pass upward into Thin-Bedded Lagoonal burrowed mud/Wackstone, representing the Maximum Flooding surface. Intercrystaline Porosity and moldic pores is recorded as very good, but locally decreasing because of the presence of large secondary Anhydrite Patches.The Porosity map shows a downflank deterioration In reservoir quality. Dolomitization process increased the porosity. The studies demonstrated 16 Shallowing-Upward Paresequences. It was recognized for Arab members as follows: A and A1 (6 Cycles), B (2Cycles), C (2Cycles) and D (6Cycles). Petrophysical Characters of each Microfacies are extracting from Log and Core Analysis in key wells. Microfacies modeling is done and petrophysical characters are populated into each facies bodies.