PROCESSING AND INTERPRETATION OF GRAVITY DATA DERIVATIVE ANALYSIS IN THE LAINEA GEOTHERMAL FIELD, SOUTH KONAWE, SOUTHEAST SULAWESI

• Main Author: Ibnu Alawi, Achmad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/84777
• Institution: Institut Teknologi Bandung

The Lainea geothermal field in Southeast Sulawesi features extensive metamorphic rocks intruded by aplite and diabase, suggesting a basement rock origin. The region's tectonic activity offers strong potential for geothermal development, with the system classified as a "heat sweep" driven by crust deformation or plutonic intrusion. Structural analysis is vital for identifying geological formations affecting underground water and steam movement, supporting reservoir capacity assessments and drilling locations. This study uses gravity and elevation data from PSDG (2010), with Bouguer anomalies ranging from -40 to 59 mGal, trending southwest-northeast with high anomalies centered in the middle of the Complete Bouguer Anomaly (CBA) map and extending eastward. The complete Bouguer anomaly is filtered using a moving average and derivative analysis {First Horizontal Derivative (FHD), Second Vertical Derivative (SVD), Tilt Derivative (TDR), Analytic Signal (AS)}. The residual anomaly ranges from -8 to 6.5 mGal, with derivative analysis results in mGal units ranging from FHD (0 – 0.0028), SVD (-3.5e-06 – 4.5e-06), TDR (-1.6 – 1.6), and AS (0 – 0.0038), the dominant lineaments trend northwest-southeast and antithetic southwest-northeast, visible across most of the map.