Derivative analysis for estimating subsurface structures in the Kawi-Songgoriti geothermal area

This research aimed to obtain density contact boundaries at the subsurface of the Kawi-Songgoriti geothermal complex. Kawi-Songgoriti area is one of the geothermal prospects in East Java which originates from the upflow zone and has a relatively rough morphology and a fairly complex geological struc...

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Bibliographic Details
Main Authors: Lestari, Nur Aini Gama, Maryanto, Sukir, Santoso, Didik Rahadi
Format: Conference Proceeding
Language:English
Subjects:
Density
Distribution patterns
Estimation
Flow distribution
Fluid dynamics
Fluid flow
Geology
Gravity anomalies
Lithology
Morphology
Satellite imagery
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Summary:This research aimed to obtain density contact boundaries at the subsurface of the Kawi-Songgoriti geothermal complex. Kawi-Songgoriti area is one of the geothermal prospects in East Java which originates from the upflow zone and has a relatively rough morphology and a fairly complex geological structure. Gravity anomalies data were obtained from secondary data from the gravity of the GGM Plus satellite image on 3150 points with the spacing up to 220 m for each point. A qualitative interpretation was conducted to the complete Bouguer anomaly. The results of complete Bouguer anomaly indicated the values between 68.8 mGal and 84.7 mGal. The residual contour map anomaly of the same lithology revealed a significant anomalous change in the northeastern part of the top of Butak wherein in the high-density lithology there was a low anomaly that dominates and the pattern corresponds to the geological structure. Estimation of the fault structure is carried out through derivative analysis in the form of first-order horizontal derivative and second-order vertical derivative to the resulting residual anomaly. Based on the derivative analysis of the Songgoriti - Kasinan manifestation area, it was found that 20 secondary structures that were suspected as faults in the study area were mapped. There are fault structures that are interpreted as part of the main fault structure. The main fault structure is thought to be caused by the morphology of the fault scarps in the form of a caldera that opens to the east. The distribution pattern pointed out the presence of secondary structures and fluid flow patterns from the reservoirs to the surface manifestations.
ISSN:0094-243X
1551-7616
DOI:10.1063/5.0106820