Moveability and Nature of the Reservoir Hydrocarbons in the Lower Miocene Jeribe Formation in X-Oilfield, Northern Iraq

Abstract

The flow capacity of the Lower Miocene Jeribe Formation was investigated in the two selected wells, A and B, of an oilfield northeast of Tikrit City. The available wireline logs and core test data are adapted for characterizing the reservoir potentiality of the formation. Three Hydraulic Flow Units was identified by calculating the values of the Flow Zone Indicators. Most parts of the formation parts have the lowest flow capacity among the three determined flow types. The Jeribe Formation contains hydrocarbons in various ratios in both wells of the study. The Reservoir Unit RUJ-1 at the upper part of the formation has the highest moveable hydrocarbon saturation, especially in the well A. Most hydrocarbons in the RUJ-3 at the lower part of the formation in both wells are immoveable. The oil-water contact was expected within Dhiban Formation in the well B and was expected to be somewhere in the underlying Dhiban or Euphrates Formations in the well A. The nature of the hydrocarbons at the uppermost few meters of the formation consists of gas or light hydrocarbons and oil at the rest of the formation(residual and moveable oils).