Abstract
Estimation of the subsurface geological structures in oil and gas prospect area of West Aceh has been done by utilizing gravity field anomaly of satellite gravity data. This research aim to analyze satellite gravity data in order to get geological features which is include deep and shallow structure or fault around oil and gas prospect area in West Aceh. The satellite gravity data is originally provided as Free Air Anomaly and should be corrected to get Complete Bouguer Anomaly (CBA). Furthermore, CBA was transformed into a horizontal plane and corrected from regional anomalous effects to obtain residual anomaly, horizontal and vertical derivative. From CBA, the gravity anomaly show good correlation with geological boundaries on different rock formation and the anomaly is decrease from NE-SW. Residual anomaly also gives same information with CBA but this anomaly focus on shallow structure. Furthermore, horizontal derivative and vertical derivative also show good correlation with geological structure or fault but in some areas the anomaly related with deep structure cannot be seen on the surface or geological map. Despite the result cannot correlate directly with oil and gas prospect area, satellite gravity can be used to identify gravity anomaly and also fault that related with hydrocarbon anomaly area
Highlights
Indonesia has a diversity of geological basins which continue to offer sizeable oil and gas potential
These fields can be used as references in order to test the viability of satellite gravity data with limited field work for regional geological mapping located in West Aceh
Scripps Institution of Oceanography, University of California San Diego, provides satellite gravity data that has been corrected to free air anomaly
Summary
Indonesia has a diversity of geological basins which continue to offer sizeable oil and gas potential. There are some fields that are in production, namely Alur Rambong, Julu Rayeue, Alur Siwah, Bata, Peulalu, Tualang, Iee Tabeue, Kuala Langsa, and Peutouw for oil fields; Julu Rayeu, Perlak, Tualang and Ie Tabeue for gas fields; and some prospects area that located around West Aceh region (Figure 1).
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