Program Intensity: Introducing seismic expertise in geothermal sites
As part of EDC’s initiatives in Geosciences Studies and Researches for Exploration and Resource Management, Program Intensity was created to provide information on well targets with potential permeability while providing geohazard insights, particularly on earthquakes. Two (2) projects exist under Program Intensity – Permanent Seismic Stations Project (PESST) and Ground Deformation Monitoring Project (GDEM). Through this program, EDC harnessed its expertise in seismic monitoring and tomography, as well as ground deformation monitoring, and applied it to the geothermal sites.
The Permanent Seismic Stations (PESST) Project constructed and installed permanent seismic stations in all EDC geothermal sites. These stations are equipped with Worldwide Interoperability for Microwave Access (WiMAX) systems that enable remote data accessibility and almost realtime data processing. The project allows EDC to monitor seismicity, identify earthquake generating structures and assess influence of resource utilization to seismicity. With its continuous recording capability and remote data access, the project has the capability to send out automated alert messages to stakeholders thru an established alert system protocol within a short period of time after earthquake occurrence. Images of the subsurface are also generated via seismic tomography (e.g. velocity, attenuation and other elastic parameters) from the data collected by the permanent stations to identify areas of interest for future development.
The insights obtained from PESST Project also provide EDC with information necessary in resource management strategies and recommendations on well targets with higher permeability. PESST Project also helps the organization establish seismically active areas and create seismic monitoring reports.
Another initiative under Program Intensity is Ground Deformation Monitoring (GDEM) Project that primarily aims to determine and evaluate the general ground movements and their behavior affecting EDC’s critical facilities. Data loggers and receivers working on Global Navigation Satellite System (GNSS) were installed fleetwide, focusing on pre-identified high-value assets such as power plants, pads, and administration buildings. The project intends to collect positional data recorded and submitted by various satellites and process them near-real time, providing ground movements information frequently at specific time intervals. Additionally, the direction of the movements in which the facilities are moving towards are also determined which gives more information on how major faults in the production fields are potentially behaving.
GDEM Project stations have been installed back in 2020 and will be collecting data until 2024 for evaluation. All data are transmitted online and are accessible for remote monitoring by end-users. Data processing and interpretation involve statistical analyses for time-series data, generating visual graphs for easier assessment. An alert system will also be established for the project after obtaining the baseline average movement in the sites.
Correlation between the projects under Program Intensity triggered by the alert systems will enable a scientific input in conducting mitigations and safety measures. All findings will be correlated with other geohazard initiatives in order to strengthen the interpretations.