An Integrated Workflow for Granitic Basement Reservoir Evaluation
- Sherif M. Farag (Schlumberger) | Cholid Mas (Schlumberger) | Pierre-David Maizeret (Schlumberger) | Bingjian Li (Schlumberger) | Hung Van Le (Lamson JOC)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- December 2010
- Document Type
- Journal Paper
- 893 - 905
- 2010. Society of Petroleum Engineers
- 5.6.4 Drillstem/Well Testing, 5.6.1 Open hole/cased hole log analysis, 3.3.1 Production Logging
- granite basement reservoirs, Fractured Reservoirs
- 3 in the last 30 days
- 1,730 since 2007
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In recent years, energy companies in the Asia Pacific region have focused increasing attention on granitic basement reservoirs, following several new oil and gas discoveries in these complex reservoirs. However, accurate formation evaluation in fractured, crystalline, granitic reservoirs is notoriously difficult. Furthermore, relatively little research has been conducted to understand logging tool response or pressure transient behavior, or to develop suitable workflows for formation evaluation in these types of reservoirs. In this paper, we propose a methodology for integrating various open-hole logs, production logs and well test data to better evaluate the reservoir potential of fractured granitic formations. Since the wells are either horizontal or highly deviated, this workflow also serves as a primary method of assessing the lateral extent of a reservoir. We include a case study from the region to illustrate the workflow. Image log interpretation, advanced acoustic measurements, nuclear logs and production logs with distributed local sensors are combined with well test data to derive the best possible evaluation of the fracture network around the borehole and the degree of connectivity with the reservoir at large. We also discuss the advantages and limitations of the proposed workflow, and set the stage for further work in this complex environment.
|File Size||10 MB||Number of Pages||13|
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