Basement configuration and geological structure analysis of Banyumas Basin based on gravity and magnetic data

Geological complexity Banyumas Basin becomes an attraction for geologists and geophysicist to conduct details research in this area. This research applies gravity and magnetic method to illustrate the subsurface geological structure patterns and basement configuration. The objective of this research is to analyze the depth of the basement from magnetic and describe the illustration of sedimentary rock. Interpretation of basement depth was processed from magnetic data, whereas geological structure and sedimentary patterns were analyzed using gravity data. Magnetic Anomaly pattern shows that low intensity of magnetic < 74nT (yellow-green) is disseminated at West-East of the map where a high intensity magnetic about > 190nT (red-purple) indicates basement rock or intrusive rock. Bouguer anomaly indicates that the area is dominated high anomaly 79.4 – 116 mgal (orange to purple) in west, north and southeast area, while low anomaly 49 – 79 mgal (blue-yellow) in the middle to the northwest of the area. Interpretation of magnetic data has guided gravity method in reconstruction basin model, especially in the basement and intrusive rock.Forward modeling of regional gravity map has pointed seven Formation with different densities, Tapak Formation; Upper Halang; Lower Halang; Pemali Formation; Gabon Formation; Karangsambung Formation and Basement rock.