Evaluation of Formations of Rakuba Basin

Abstract

Muglad Basin of Sudan is highly complicated by faulting. Interpreted seismic data show large numbers of tensional faults which have affected the overall basin and have formed several sub-basins. One of the sub-basins distributed around Muglad Basin is Rakuba sub-basin. This study aims to conduct formation evaluation on Rakuba sub-basin, and focuses on Bentiu and Abu Gabra formations through well logging data interpretation gathered from three wells Najah1, Falah1, and Rabah1. The main goal is divided into two stages; the first stage is to do petro-physical evaluation, and the other stage is log-facies analysis. Petrophysical evaluation has been performed where shale volume has been calculated; furthermore porosity, water saturation, permeability, and cut off have been estimated. Moreover, results properties correlated, to facilitate second stage log-facies made based on K-mean cluster analysis. According to methods applied to data and after analyzing, Bentiu formation classified as a good homogenous reservoir rock, Abu Gabra formation classified as heterogeneous formation and possible to be a source rock. However both of them are full saturated with water. The rock type identified and categorized into three facies.