The first repeated absolute gravity measurement for geothermal monitoring in The Kamojang Geothermal Field, Indonesia

Yayan Sofyan, Yunus Daud, Jun Nishijima, Yasuhiro Fujimitsu, Yustin Kamah, Ahmad Yani, Yoichi Fukuda, Makoto Taniguchi

研究成果: Contribution to journalArticle

3 引用 (Scopus)

抜粋

In more than 25 years, repeated gravity measurements (RGM) for geothermal monitoring have been applied in the Kamojang Geothermal Field (KGF), Indonesia. Pertamina has carried out RGM using relative gravimeters at more than 50 benchmarks at KGF since 1984. They used LaCoste-Romberg type G 653, G 655, and Scintrex CG-3 gravimeters to estimate gravity variation. In 2009, we introduced a new microgravity network using A10 (#017) micro-g, a portable absolute gravimeter, which we re-occupied in 2010 and 2011.We identify gravity value changes in production and injection area of KGF as well as changes at the reference station. A linear trend of declining mass of about -17.9. μGal/year at PG48A, a benchmark far from production and injection wells, reveal the temporal gravity variation outside of geothermal reservoirs. The series of monitoring in this present research shows the distribution of large negative gravity changes up to -80. μGal. The large mass loss stays continues to maintain massive production throughout 200. MWe installed capacities at KGF.The absolute gravity measurements improve the result of gravity change data for monitoring. This present study introduces new technology that will enhance the method of reservoir monitoring using repeated precisely-gravity measurements. The use of absolute gravimeter is the best way to account for regional effect, and correct for changes at the base and reference station over time.

元の言語英語
ページ(範囲)114-124
ページ数11
ジャーナルGeothermics
53
DOI
出版物ステータス出版済み - 1 2015

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Geotechnical Engineering and Engineering Geology
  • Geology

フィンガープリント The first repeated absolute gravity measurement for geothermal monitoring in The Kamojang Geothermal Field, Indonesia' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

  • これを引用