Training Geology, Geophysics and Geochemistry for Geothermal Exploration

Duration: 3 (three) weeks course

Instructors:

  1. Dr. Ir. Prihadi Soemintadireja (Ir: ITB, MT: ITB, Dr: Univ. Kyushu)
  2. Ir. Niniek Rina Herdianita, MSc., PhD (MSc: Ir: ITB, MSc: Univ. Auckland, PhD: Univ. Auckland)
  3. Dr. Hendra Grandis (Drs: ITB, DEA: Univ. Paris 7, DrĀ : Univ. Paris 7)

About the Course:
This course discusses various methods of geology, geophysics and geochemistry used during exploration of geothermal or hydrothermal system

  • Geology overviews various surveys used during geothermal exploration. Furthermore, it gives knowledge about alteration minerals, especially ones which are common in geothermal system.
  • Geophysical study overviews various surveys used during geothermal exploration. It gives knowledge how to compile geological condition and geophysics anomalies and physical properties of rock to understand subsurface structure or reservoir.
  • Geochemistry overviews various surveys used during geothermal exploration, type and distribution of geothermal fluids and interpretation of reservoir condition.

  1. Geology (5 days):
    The aim of the course is to give an understanding of the geothermal system and geological methods and their application to identify a geothermal area, including its surface manifestation, within a volcanic area. Another main subject of this course is to understand various minerals commonly occurring in geothermal system, its type of alteration and how to use it to understand the behavior of reservoir.
  2. Course details:
    Day Time Subject
    1 08:00 - 10:00 Geothermal system
    10:30 - 12:00 Geothermal exploration
    13:00 - 15:00 Geology for geothermal exploration
    2 08:00 - 10:00 Volcanic product deposit
    10:30 - 12:00 Mapping in volcanic area
    13:00 - 15:00 Identification of geothermal area
    3 08:00 - 10:00 Geothermal fluid: type
    10:30 - 12:00 Geothermal surface manifestation
    13:00 - 15:00 Estimation of geothermal resource based on natural heat loss
    4 08:00 - 10:00 Surface/near surface hydrothermal alteration
    10:30 - 12:00 Subsurface hydrothermal alteration
    13:00 - 15:00 Utilisation
    5 08:00 - 10:00 Case study: geology for geothermal exploration
    10:30 - 12:00 Case study: geology for geothermal exploration
    13:00 - 15:00 Natural hazard in volcanic/geothermal area



  3. Geophysics (5 days):
    This course covers both static and dynamic geophysical method commonly applied for geothermal exploration in order to reveal the subsurface condition. The method includes gravity and magnetic, geo-electrical, magnetotelluric (MT), transient electromagnetic (TEM) and micro-earthquake (MEQ) methods. Some applications are given for discussion.
  4. Course details:
    Day Time Subject
    1 08:00 - 10:00 Overview of geophysics for geothermal exploration
    10:30 - 12:00 Gravity method (theory)
    13:00 - 15:00 Processing of gravity data: Application / discussion
    2 08:00 - 10:00 Magnetic method (theory)
    10:30 - 12:00 Advanced data processing of gravity and magnetic data
    13:00 - 15:00 Exercice of gravity and magnetic method.
    3 08:00 - 10:00 Geo-electrical method I (VES, mapping/imaging)
    10:30 - 12:00 Geo-electrical method II (SP, MAM)
    13:00 - 15:00 Exercice of geo-electrical methods: Application / discussion
    4 08:00 - 10:00 Data acquisition and processing of magnetotelluric (MT) data
    10:30 - 12:00 Modeling of MT data
    13:00 - 15:00 Exercice of MT method: Application / discussion
    5 08:00 - 10:00 Transient Electromagnetic (TEM) method
    10:30 - 12:00 Micro-earthquake (MEQ) method
    13:00 - 15:00 Exercice of TEM method: Application / discussion



  5. Geochemistry (5 days):
    This course covers all aspects of chemistry at geothermal fluid. It explains type, composition, origin and distribution of the fluids; and the effects of boiling, mixing and condensation to the composition of water. How to understanding of the reservoir condition is also given, followed by the behaviors of gas and stable isotope in geothermal systems. At last the course will point out on monitoring of production wells, including scaling formation and corrosively in production pipes, and environmental aspects.

Course details:
Day Time Subject
1 08:00 - 10:00 Geochemistry for geothermal exploration
10:30 - 12:00 Geothermal fluid: origin & distribution
13:00 - 15:00 Sampling & chemical analysis of geothermal fluid
2 08:00 - 10:00 Characteristic of geothermal fluid: pH, salinity & ion balance
10:30 - 12:00 Process occurring in geothermal fluid: boiling, mixing & condensation
13:00 - 15:00 Estimation of reservoir fluid characteristic
3 08:00 - 10:00 Geothermal gas
10:30 - 12:00 Stable isotope in geothermal
13:00 - 15:00 Geothermometer
4 08:00 - 10:00 Scaling & corrosion
10:30 - 12:00 Monitoring of well production
13:00 - 15:00 Geochemical survey for geothermal exploration
5 08:00 - 10:00 Case study: geochemistry for geothermal exploration
10:30 - 12:00 Case study: geochemistry for geothermal exploration
13:00 - 15:00 Environmental impact due to geothermal development