SPE Reservoir Evaluation & Engineering
Volume 13, Number 6, December 2010, pp. 893-905

SPE-123455-PA

An Integrated Workflow for Granitic Basement Reservoir Evaluation

View full textPDF ( 1 KB )

DOI  More information 10.2118/123455-PA http://dx.doi.org/10.2118/123455-PA

Citation

  • Farag, S., Mas, C., Maizeret, P.D., Li, B., and Hung, L.V. 2010. An Integrated Workflow for Granitic-Basement-Reservoir Evaluation. SPE Res Eval & Eng  13 (6): 893-905. SPE-123455-PA. doi: 10.2118/123455-PA.

Discipline Categories

  • 6.1 Reservoir Geology and Geophysics
  • 6.1.2 Faults and Fracture Characterization
  • 6.6.1 Well Logging
  • 6.6.3 Pressure Transient Testing
  • 6.10.2 Naturally-Fractured Reservoirs

Keywords

  • granite basement reservoirs, Fractured Reservoirs

Summary

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.

© 2010. Society of Petroleum Engineers

View full textPDF ( 1 KB )

History

  • Original manuscript received: 31 May 2009
  • Meeting paper published: 4 August 2009
  • Revised manuscript received: 16 June 2010
  • Manuscript approved: 30 September 2010
  • Published online: 8 December 2010
  • Version of record: 9 December 2010