Abstract
Constructing a fine 3D geomodel for complex giant reservoir is a crucial task for hydrocarbon volume assessment and guiding for optimal development. The case under study is Mishrif reservoir of Halfaya oil field, which is an Iraqi giant carbonate reservoir. Mishrif mainly consists of limestone rocks which belong to Late Cenomanian age. The average gross thickness of formation is about 400m. In this paper, a high-resolution 3D geological model has been built using Petrel software that can be utilized as input for dynamic simulation. The model is constructed based on geological, geophysical, pertophysical and engineering data from about 60 available wells to characterize the structural, stratigraphic, and properties distribution along the reservoir. Fourteen geological surfaces for all Mishrif units have been generated based on well tops data and top Mishrif structural map. The reservoir has been divided into 163 sublayers through the vertical direction and 160*383 grid cells in x-y direction with 9,988,640 total grid cells. A scale up process are performed for well log data, then, Sequential Gaussian Simulation algorithm are applied to fill 3D grid cells with properties values in areas away from wells. Pertophysical properties distribution for all reservoir zones are analyzed. The estimated initial oil in place of Mishrif through this model is close to that calculated in other previous studies.
Highlights
One of the essential steps before building a dynamic simulation model is undoubtedly the definition of a geological model or static model of the reservoir rock, (Cosentino, 2001)
In the other Mishrif Formation units, the porosity values are significantly varied along each unit in the formation with more favorable porosity values detected in the units MB2-3 and MC1-1
The total initial oil in place of Mishrif reservoir is about 9,661 MMSTB, of which main unit MB1 accounts for about 72.8% while MA, MB2 and MC1 account for 7.7%, 14.3% and 5.2%, respectively
Summary
One of the essential steps before building a dynamic simulation model is undoubtedly the definition of a geological model or static model of the reservoir rock, (Cosentino, 2001). The main goal of this paper is to build a fine three dimensional geological model based on field data available from about 60 wells passed through Mishrif formation in Halfaya oilfield. This 3D geo-model includes structural, stratigraphic and the petrophysical to characterize the variation of these properties along Mishrif formation and estimate the oil initially in place for both whole Mishrif formation and subunits. The field is located in Missan province in Iraq southeast, 35 Km southeast of Amara city, as shown in Fig.. Up to June 2017, a total of 197 new wells have been completed drilling
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