Publications

An extensive core observation was conducted for the Middle Jurassic Upper Plover Formation in Abadi gas field. The result has been used as the fundamental inputs for constructing the geological/reservoir models. Based on the core observation, 9 major lithofacies were defined based on lithology, grain size, visually estimated sand-silt content and the presence or absence of primary sedimentary structures and bioturbation. Ichnofabric analysis was also conducted in order to predict the paleo depositional environment. In the Upper Plover Formation, trace fossil assemblages are capable of providing sensitive information on fluctuations in depositional energy levels, water depth, sedimentation rates, salinity, storm, water turbidity, substrate consistency and dissolved oxygen levels. By integrating the stratigraphic unit, lithofacies, the ichnofacies and petrophysical properties (i.e., porosity, permeability, etc), the Facies Association (FA) was defined in order to construct the depositional model and to evaluate the distribution of reservoir rock properties in the reservoir (i.e., porosity, permeability and Sw, etc.). This paper summarizes the process of FA definition in relation to reservoir properties in shallow marine siliciclastic strata based on the detailed core observation in the Abadi gas field.