Palinspastic Reconstruction of X Block, Anggursi Sub-Basin

North Anggursi Sub-basin is one of the sub-basins in the North West Java Basin, located on northern of North West Java Basin. North Anggursi Sub-basin regionally was a sinistral pull-apart basin with northeast-southwest orientation which the direction of the extension was east west at Eocene. This subbasin is a back-arc basin during the Eocene to Oligocene. The dynamics of the North Anggursi Sub-basin were analysed using the palinspastic reconstruction method using 2D seismic lines which have east-west direction and biostratigraphy data. This analysis was carried out to determine the tectonic evolution to sub-basin tectonostratigraphy. Based on the results of subsurface mapping, the dominant type of geological structure in the study area is normal fault with NW-SE orientation. There was one unconformity phase during the Eocene. The forming of the North Anggursi Sub-basin began with the formation of Pre-Tertiary basement rock with an average rift of 6%. At Eocene began the syn-rift tectonic event with an average rift of 3%. After Eocene I, there was the deposition of Eocene II units which had compression with an average compression rate of 7% and then eroded. Syn-rift events began to end in the Oligocene with an average rift of 2%. Early Miocene began the post-rift phase with an average of rift of 1%. In Middle Miocene, there was an rift with an average of 1% and ended with Late Miocene by 0%. The intensity of rifting was very high during the Eocene, resulting in horst and half-graben morphology. The dynamics of the North Anggursi Sub-basin started from the Eocene to recent with three tectonic phases, they were the pre-rift that occurred during the Pre-Tertiary with the type of poly history basin of Continental Interior Sag (CIS), the syn-rift that occurred in the Eocene-Oligocene with the type of poly history basin of Continental Interior Fracture (CIF), and the post-rift the occurred in the Early Miocene-Late Miocene with the type of poly history basin of Continental Interior Sag (CIS).