LAUSR

Abstract A cyclostratigraphic analysis is performed using high-resolution well data to study the facies development, characteristics, and patterns of the Miocene syn-rift succession in the Gulf of Suez. The impact of syn-depositional tectonics on the distribution of reservoir units is also highlighted. The study area is in Al Amir and Geyad fields, which are located in the southwestern onshore part of the Gulf of Suez rift. The Cyclolog® software workflow has been applied on nine wells from these two fields using the Gamma Ray log of the Miocene sequences. The Predictive Error Filter Analysis (PEFA) patterns and Integrated Predictive Error Filter Analysis (INPEFA) curves support the definition and distinction of seven 3rd order cycles. These cycles are numbered as 1.4, and 1.5 for Nukhul Formation, 2.1, 2.2, and 2.3 for Rudeis Formation, 2.4 for Kareem Formation, and 2.5 for Belayim Formation. The Kareem Formation is represented by cycle 2.4 and could be divided into higher order subcycles 2.4 (a, b (u and l), c, d and e). The oil reservoir units occur in subcycle 2.4.b (u and l), whereas subcycle 2.4.b (l) is missing in Geyad field and subcycle 2.4.b (u) is missing in Al Amir SE-1X St well. Correlation profiles and isochore maps of the Upper Rudeis and Kareem formations (cycles 2.3 and 2.4 respectively) indicate the relationship between sediment supply and accommodation space which are related to tectonic subsidence of the West Zeit Basin and sediment supply from the Esh El Mellaha range.