Evaluation of reservoir characteristics using well data of sibayak geothermal field, North Sumatra, Indonesia

J. P. Atmojo, R. Itoi, M. Fukuda, S. Sudarman

Research output: Contribution to journalArticlepeer-review

Abstract

The Sibayak geothermal field is located in northern part of Sumatra Island, Indonesia. Exploration surveys were conducted during 1989-1997 when ten exploration wells were drilled. Repeated temperatures logging in the wells are analyzed for initial formation temperature using a Horner plot. Then estimated highest formation temperatures are plotted on the activity index curve1) for quantitative evaluation of the thermal potential of wells. Initial reservoir pressures are also determined from a pivot point of pressure profiles. The results show the maximum formation temperature in the Sibayak reservoir reaches up to 310°C. A few wells located in the central part in Sibayak are evaluated to be of Type A of activity index (AI) suggesting high thermal potential. On the other hand, wells at southern part belong to Types C and D of AI. These low grades of thermal potential may be caused by low temperature water inflow along the caldera rim.

Original languageEnglish
Pages (from-to)129
Number of pages1
JournalMemoirs of the Graduate School of Engineering, Kyushu University
Volume60
Issue number3
Publication statusPublished - 2000

All Science Journal Classification (ASJC) codes

  • General Energy
  • Process Chemistry and Technology
  • Atmospheric Science
  • Management of Technology and Innovation
  • General Earth and Planetary Sciences

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