Stratigraphic Interpretation Of The Middle Miocene Deltaic Sediment In The Sangatta Area, Based On Quantitative Palynological Data

This study demonstrates the ability of palynology in helping explorationist to comprehend the stratigraphic framework of the middle Miocene formation in the Sangatta area. Palynological analysis is performed on three different wells which are called X, Y and Z. With the exception of the samples situated in the lower part of the studied wells, most samples yield excellent palynomorph assemblages. High abundance of mangrove pollen suggests a good development of mangrove forest which indicates the occurrence of deltaic sediments within these three wells. The studied wells have been correlated based on the abundance of mangrove pol- len Zonocostites ramonae and freshwater swamp pollen Ilexpollenites sp. This correlation allows reconstruction of the local palynological scheme for the Sangata area. The combination between quantitative palynological analysis and litological data (inferred from well logs) allows interpretation of sequence stratigraphic units including transgressive and highstand units. These units separate the studied sediments into three progradational units (Units 1, 2 and 3) which figure out the development of Middle Miocene deltaic facies in the Sangata area.