Abstract
The Albian Mauddud reservoir of the Khabbaz Oil Field is consisting of 170 m alternating shelf carbonates and pervasive dolomite horizons of coarse to fine crystalline mosaic. Core analysis and log measurements reveal the occurrence of three electrofacies units (A, B, and C) with variable petrophysical properties. Unit A with good reservoir quality shows average porosity of 18.8 % and average permeability of 27.5 md. The other two units (B and C) are less attractive and have an average porosity of 9.6 % and 9.2 % consequently. Pore size ranges between macro to meso types and related mainly to vugs, fractures and intercrystalline porosity, especially in the dolomite units. The reservoir fluids saturation, bulk volume, and mobility are evaluated using resistivity logs measurements and porosity logs (Neutron-Density porosities) in addition to other reservoir laboratory data. Calculations and cross data plotting of the related petrophysical parameters were applied to the three units of the Mauddud reservoir in seven wells of the field. It shows an overall good reservoir fluids mobility. Results indicate that the formation water of Khabbaz Oil Feld is a non-movable type especially for the crestal wells which make most of these wells produce water-free hydrocarbon. Variability within well’s hydrocarbon mobility is noticed and related to units and subunits lithology and porosity variation. Other variations seem to be related mainly to permeability, pores geometry and variability of water saturation in addition to the location of well with respect to oil pool within the field structure.
Highlights
The Khabbaz field is estimated to contain more than 500 million bbl of oil reserve within the main reservoir packages and considered as a giant oil field (Verma, et al, 2004)
Deep (Rt), and shallow (Rxo) resistivity data obtained from Dual Laterolog Deep (LLD) and Micro Spherical Focused log, respectively and in some of the studied wells they had been replaced by Induction Electrical Log (Short Normal and Induction)
The values of the drilling mud filtrate resistivity (Rm) and mud filtrate resistivity of flushed zone (Rmf) and the uninvaded formation water resistivity (Rw) were corrected to well temperature using N.O.C. laboratory measurements (Table 3). These parameters were used with resistivity log data to calculate the fluids saturation, bulk volume of water, bulk volume of hydrocarbon, movable hydrocarbon fraction and residual hydrocarbon fraction according to equations set by Asquith and Krygowski, (2004)
Summary
The Khabbaz field is estimated to contain more than 500 million bbl of oil reserve within the main reservoir packages (the Cretaceous and Tertiary reservoirs) and considered as a giant oil field (Verma, et al, 2004). The Khabbaz Field can produce about 25,000 barrels of oil per day and 45 MCF/d of gas (APS Review, 2007). 2021, 54 (2B), 42-54 about 20 km WNW of Kirkuk City in northern Iraq, to the southwestward of the giant Kirkuk structure (Fig. 1). The structure of the Khabbaz oil field represents a domal anticline 20 km long and 4 km wide with a slightly curving axis (Fig. 2). Forty wells so far have been drilled at the Khabbaz Field, most of them have targeted the Tertiary reservoirs, some wells have penetrated the Cretaceous Qamchuqa carbonates (the Mauddud and Shuaiba reservoirs). The field is reported to currently produce about 25,000 Mbbl/d of oil and 45 MCF/d of gas (APS Review, 2007)
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