Structural, Stratigraphic Geology and Pressure Compartmentalization of Feradus Field Based on 3-D Seismic Data and Subsurface Geology

Abstract

Abstract Field development plan is an integration among Geophysical, Geological, Petrophysical and Reservoir Engineering data. The 3D seismic and wellbore data confirm that the field is composed of complex structures with variable of oil-water contact and differences in pressure surveys. A major source of these variations is compartmentalization, which is defined as limitation on the ability to produce hydrocarbons resulting from permeability barriers within a field. Two primary causes of compartmentalization. These are Stratigraphic and Structural variations in permeability. Ferdaus field is located in East Abu Gharadig basin in Western Desert, Egypt. It produces oil from Cretaceous sandstones mainly from three reservoirs: Middle, Lower Abu Roash “G” (A/R “G”) members and Upper Bahariya Formation. In Ferdaus field, Middle and Lower Abu Roash “G” members were deposited as barrier bars according to which the effects of the lateral and vertical sand facies changes within the productive sand intervals, have very limited impact on the pore connectivity based on Electric logs and mud log data. Therefore; the stratigraphic variations were neglected.. Structural compartmentalization, fault properties can constrain the fluid flow and pressure development, thus affecting decisions associated with the selection of the drainage strategy within reservoir management activities in order to maintain the pressure and increase the oil production rate. By using 3D seismic data, electric logs and pressure data made it possible to sudivide the field into compartments which differ in number based on the reservoir level. This gave good estimates for the Original Oil In Place (OOIP) and reserves which leads to apply a good development plan by infill wells and/or increasing the productivity by applying secondary recovery project (water injection).