Geological Model for Mauddud Reservoir Khabaz Oil Field

Abstract

The Mauddud reservoir, Khabaz oil field which is considered one of the main carbonate reservoirs in the north of Iraq. Recognizing carbonate reservoirs represents challenges to engineers because reservoirs almost tend to be tight and overall heterogeneous. The current study concerns with geological modeling of the reservoir is an oil-bearing with the original gas cap. The geological model is establishing for the reservoir by identifying the facies and evaluating the petrophysical properties of this complex reservoir, and calculate the amount of hydrocarbon. When completed the processing of data by IP interactive petrophysics software, and the permeability of a reservoir was calculated using the concept of hydraulic units then, there are three basic steps to construct the geological model, starts with creating a structural, facies and property models. The reservoirs were divided into four zones depending on the variation of petrophysical properties (porosity and permeability). Nine wells that penetrate the Cretaceous Formation (Mauddud reservoir) are included to construct the geological model. Zone number three characterized as the most important due to it Is large thickness which is about 108 m and good petrophysical properties are about 13%, 55 md, 41% and 38% for porosity, permeability, water saturation and net to gross respectively. The initial oil and gas in place are evaluated to be about 981×106 STB and 400×109 SCF.

Carbonate Ramp Facies and Porosity Recognition: Case Study of the Late Albian-Early Cenomanian Mauddud Formation in Ratawi Oilfield, Southern Iraq

“…Tectonic movement can form fracture porosity in two ways. These are the tension over the crests of compressional anticlines and compaction drapes [27,28]. Fracture porosity is also intimately associated with faulting and some oil fields show very close structural relations with individual fault systems [23] this type of porosity existed only in well Ratawi-17 at depths 2513 and 2529, (Pl.2-I), fracture porosity can cause by syn-depositional, post-depositional burial cracking of rocks or via brash fracture of shell or by increasing overload before cementation, folding and faulting [19].…”