Print this pageAAPG GEO 2010 Middle East
Geoscience Conference & Exhibition
Innovative Geoscience Solutions – Meeting Hydrocarbon Demand in Changing Times
March 7-10, 2010 – Manama, Bahrain
Fracture Characterization and Modeling of Unconventional Najmah-Sargelu Reservoirs of Umm Gudair Field, West Kuwait
(1) KOC, Ahmadi, Kuwait.
(2) Beicip FranLab, Paris, France
Najmah-Sargelu (NJ-SR) unconventional naturally fractured carbonate reservoirs are spread across many fields in West Kuwait, some of which, such as Umm Gudair are on production for last 25 years. Natural fractures have a significant impact on the reservoir performance as it affects well productivity. Therefore, understanding their significance through fracture characterization is helpful in well placement and field development. This paper presents an overview of efforts in building a 3D stochastic fracture model for reservoir characterization of Umm Gudair field. This model is generated in FracaFlow© through the analysis and integration of well data like cores (including oriented core), bore hole images (BHI), well-logs, mud losses, production logging and well test data along with 3D Q-Seismic data through structural, seismic attribute and seismic facies analyses.
The impact of lithology on fracture occurrence was quantified based on rock-typing and distributed using a high resolution sequence stratigraphy framework. Rock types are a real 3D fracture driver & provide a reliable means of adjusting the density of diffuse fracture in the Najmah-Sargelu Reservoirs of Umm Gudair Field. Three sets of diffuse fractures were identified from bore hole image data: N20°E, EW and N170°E. Large-scale fracture corridors including sub-seismic faults, identified from seismic analysis were calibrated with core and BHI fractures through fracture data analysis workflows. The model finally incorporates two scales of tectonic fractures: diffuse fractures and large-scale fractures that have a direct bearing on well and field production behavior.
The fracture calibration was performed using the dynamic data set such as production log and well wise production data. Synthetic well tests were simulated and matched with the real build-up data at wells. These data were then used to propagate 3D fracture properties (fracture porosity, fracture permeability and equivalent block size) for constructing reservoir simulation model.