Abstract
Naturally, fractured reservoirs play a considerable part in the study, production, and development of hydrocarbon fields because most hydrocarbon reservoirs in the Zagros Basin are naturally fractured. Production from those reservoirs is usually affected by the presence of a system of connected fractures. In this study, the Tabnak hydrocarbon field on the fold–thrust belt at the Zagros zone in the Persian plate has been analyzed by the facies models, folding mechanism analysis to identify fracture reservoir patterns. The results show a flexural fold with similarity in the folding mechanism and some open fracture potential made by limestone, shale, clay, and anhydrite in the study area's facies models. Consequently, the stress pattern and type of fracture issue on the fold's upper and lower layers will be similar. On the Tabnak anticline reservoir using image processing techniques in MATLAB R2019 software and kriging geostatistical methods, fracture surface patterns as a block model extended to the depth. Using the model results, fractures’ orientation distribution in adjacent wells 11, 14, and 15 is appropriate. The results also have similarities with the facies models, folding mechanism assessment, well test, and mud loss data analysis. These results can affect the development plans’ primary approach by drilling horizontal and sleep wells and hydrocarbon reservoir management strategies.
Highlights
The Zagros orogenic belt in Iran is part of the Alpine-Himalayan mountain range, extending about 2000 km from the northwest (Anatolian Fault in Eastern Turkey) to the southeast Oman Line (Berberian and King 1981; Alavi 1994).In the folded–thrust Zagros belt, two different types of folds are observed, one of which is bending folds and the other is fault-related folds
High gas production from some formations of the Tabnak hydrocarbon field in Iran indicates a naturally fractured reservoir dominated by structural fractures and facies models
To identify the pattern of natural fractures in Tabnak hydrocarbon reservoir, folding mechanism and facies models are used to investigate the effects of porosity, permeability, fracture density on the part of a back limb of Tabnak fold
Summary
The Zagros orogenic belt in Iran is part of the Alpine-Himalayan mountain range, extending about 2000 km from the northwest (Anatolian Fault in Eastern Turkey) to the southeast Oman Line (Berberian and King 1981; Alavi 1994).In the folded–thrust Zagros belt, two different types of folds are observed, one of which is bending folds and the other is fault-related folds. High gas production from some formations of the Tabnak hydrocarbon field in Iran indicates a naturally fractured reservoir dominated by structural fractures and facies models. To identify the pattern of natural fractures in Tabnak hydrocarbon reservoir, folding mechanism and facies models are used to investigate the effects of porosity, permeability, fracture density on the part of a back limb of Tabnak fold.
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