Integrated Reservoir Characterization Studies of Bahariya Formation in the Meleiha-NE Oil Field, North Western Desert, Egypt

Abstract EN

The first objective of this paper is to do seismic interpretation of thirty four 3D seismic sections for identifying the structural traps, and the second is to use the well log data to determine the reservoir characteristics and fluid contents.

The seismic interpretation covered eight steps, namely; reflectors identification, picking and correlation of reflectors, fault location, closing loops, velocity analysis, digitization, time to depth conversion, constructing geo-seismic cross-sections and construction of the isochronous and structural contour maps.

The seismic interpretation reflects the outstanding role of faulting and folding on the top of Bahariya Formation in the studied area.

The high values of core porosity indicate that the Bahariya Formation belongs to the high quality reservoir.

The low correlation coefficients of some porosity relations reflect the influence of porosity heterogeneity in the studied wells.

The well log analysis procedures are performed in five phases; Digitizing, data gathering, environmental corrections, multi-well normalization and formation evaluation tasks.

The well log interpretation used to determine the properties and fluid contents of Bahariya reservoir indicates its high values porosity, that consider it as a high quality reservoir.

The fluid contents of Bahariya Formation are illustrated in three forms; distribution maps, litho-saturation cross-plots and models.

The fluid contents distribution maps reflect a general increase of hydrocarbon at the northwestern and southeast parts of the study area at NE-1x well and NE-14 well, respectively.

The fluid content litho-saturation cross-plots show that, Bahariya Formation consists of sandstone, shale, limestone, and the effective porosity is filled by fluids which are; water, irreducible hydrocarbon and/or movable hydrocarbon.

These fluids have widely vertical distribution in each well.

Litho-saturation cross-plots ensure that, the southeastern part of the study area is the best place to produce oil.

The reservoir fluid contents 3D models show that, the hydrocarbon saturation concentrate in the northwestern and southeastern parts of the study area and oil in place is controlled by the structural traps.