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Integrated fracture characterization of Asmari reservoir in Haftkel field

Integrated fracture characterization of Asmari reservoir in Haftkel field

Authors :
Khadivi, Kourosh
Alinaghi, Mojtaba
Dehghani, Saeed
Soltani, Mehrbod
Hassani, Hamed
Mosavi, Seyed Chaseb
Shiralipour, Mansour
Fardin, Hashem
Sanjari, Sadegh
Partovi, Mohammad
Source :
Journal of Petroleum Exploration and Production Technologies; July 2022, Vol. 12 Issue: 7 p1867-1887, 21p
Publication Year :
2022

Abstract

The Asmari reservoir in Haftkel field is one of the most prolific naturally fractured reservoirs in the Zagros folded zone in the southwest of Iran. The primary production was commenced in 1928 and continued until 1976 with a plateau rate of 200,000 bbl/day for several years. There was an initial gas cap on the oil column. Gas injection was commenced in June 1976 and so far, 28% of the initial oil in place have been recovered. As far as we concerned, fracture network is a key factor in sustaining oil production; therefore, it needs to be characterized and results be deployed in designing new wells to sustain future production. Multidisciplinary fracture evaluation from well to reservoir scale is a great privilege to improve model’s accuracy as well as enhancing reliability of future development plan in an efficient manner. Fracture identification and modeling usually establish at well scale and translate to reservoir using analytical or numerical algorithms with the limited tie-points between wells. Evaluating fracture network from production data can significantly improve conventional workflow where limited inter-well information is available. By incorporating those evidences, the fracture modeling workflow can be optimized further where lateral and vertical connectivity is a concern. This paper begins with the fracture characterization whereby all available data are evaluated to determine fracture patterns and extension of fracture network across the field. As results, a consistent correlation is obtained between the temperature gradient and productivity of wells, also convection phenomenon is confirmed. The findings of this section help us in better understanding fracture network, hydrodynamic communication and variation of temperature. Fracture modeling is the next step where characteristics of fractures are determined according to the structural geology and stress directions. Also, the fault’s related fractures and density of fractures are determined. Meanwhile, the results of data evaluation are deployed into the fracture model to control distribution and characteristics of fracture network, thereby a better representation is obtained that can be used for evaluating production data and optimizing development plan.

Details

Language :
English
ISSN :
21900558 and 21900566
Volume :
12
Issue :
7
Database :
Supplemental Index
Journal :
Journal of Petroleum Exploration and Production Technologies
Publication Type :
Periodical
Accession number :
ejs58634026
Full Text :
https://doi.org/10.1007/s13202-021-01435-4