Training Geo-Electrical Method for Geothermal Exploration

Duration: 5 (five) days course

Instructor: Dr. Hendra Grandis (Drs: ITB, DEA: Univ. Paris, Dr : Univ. Paris)
Dr. Hendra Grandis has many years of experience in applying DC-resistivity and magnetotelluric methods for various targets and purposes. He received his BS. in Geophysics from Institut Teknologi Bandung in 1986, and received his Diplôme d'Etudes Approfondies (DEA) and Ph.D. in Applied Geophysics from Université Paris, France in 1990 and 1994 respectively. He is currently an Associate Professor of Geophysics at ITB. His research interest includes inversion modeling of geophysical data that covers magnetotellurics (MT) and other non-seismic geophysical (gravity, magnetic and geo-electrical) methods and their application for resources exploration and hazard mitigation.

About the Course:
The geo-electrical methods are the most widely used geophysical methods to explore the geothermal resources. The geo-electrical methods study the physical property of rocks, i.e. electrical resistivity or conductivity which is directly related to the thermal phenomenon prevailing in the geothermal areas. This course will be focused on direct-current (DC) resistivity and magnetotelluric (MT) methods as primary geophysical methods for geothermal exploration. However other specific and related techniques will be discussed as well (e.g. Self-Potential, Mise-a-la-Masse, Transient EM).

The course will assume a basic knowledge in geology and geophysics, with possible extension to a more general audience with engineering background. The participants will gain the knowledge necessary to design and to plan cost-effective DC-resistivity and MT field program and to manage the survey.

The aim of the course is to give an overview of geo-electrical methods and their application for geothermal exploration. This course will introduce the participants to the concept of DC-resistivity and MT methods, basic data processing and interpretation issues as well as recent development in those aspects of the methods. There will be also discussion sessions on case studies of DC-resistivity and MT application whithin the geothermal exploration framework.

Time Schedule:
The course is scheduled for 4 days that can be divided into 2 parts with 2 days each. The detailed schedule of the course is described the following table.

Course details:

Part I. DC-Resistivity Method
Day Time Subject
1 08:00 - 10:00 Overview of geophysics for geothermal exploration
10:30 - 12:00 Basic theory of geo-electrical methods
13:00 - 14:30 DC-resistivity measurement techniques (mapping, sounding)
15:00 - 16:00 Exercise of DC-resistivity method (1)
2 08:00 - 10:00 DC-resistivity measurement techniques (imaging)
10:30 - 12:00 Self-Potential and Mise-a-la-Masse techniques
13:00 - 14:30 Discussion on application and case studies
15:00 - 16:00 Exercise of DC-resistivity method (2)
Part II. Magnetotelluric Method
Day Time Subject
1 08:00 - 10:00 Basic theory of magnetotelluric (MT) method
10:30 - 12:00 Data acquisition and processing of MT data
13:00 - 14:30 Modeling of MT data (1)
15:00 - 16:00 Exercise of MT method (1)
2 08:00 - 10:00 Modeling of MT data (2)
10:30 - 12:00 Transient Electromagnetic (TEM) method and static shift correction
13:00 - 14:30 Discussion on application and case studies
15:00 - 16:00 Exercise of MT method (2)
3 08:00 - 16:00 Exercise continued