Abstract
<p>This study attempts to reconstruct paleogeography of Banyumas Basin in association with magmatic arc evolution and its implication to petroleum potential. Based on the volcanic rocks distribution, their association and relatives age, there are three alignments of a magmatic arc, that are: (1) Oligo-Miocene arc in the south (2) Mio-Pliocene arc in the middle (3) Plio-Pleistocene arc in the north. The consequences of the magmatic arc movement were tectonic setting changing during Oligocene to Pleistocene, as well as their paleogeography. During Oligo-Miocene where magmatic arc existed in the southern part, the Banyumas tectonic setting was a back-arc basin. This tectonic setting was changing to intra-arc basin during Mio-Pliocene and subsequently to fore-arc basin since Plio-Pleistocene until today. Back-arc basin is the most suitable paleogeography to create a depositional environment for potential source rocks. Exploration activity to prove the existence of source rocks during Oligo-Miocene is needed to reveal petroleum potential in Banyumas Basin.<br></p>
Highlights
Banyumas basin is one of a sedimentary basin in the southern coast of Central Java, Indonesia
It is important to know how the petroleum system works in Banyumas basin and one step to understanding it better is by studying the paleogeography of Banyumas basin from time by time
Association of volcanic rocks related to the central zone and proximal zone of a magmatic arc are breccia, lava, intrusion dike or sill
Summary
Banyumas basin is one of a sedimentary basin in the southern coast of Central Java, Indonesia. The previous researcher called Banyumas Basin as Terra Incognita, a place that has not yet fully understood in terms of its petroleum systems [1]. It is important to know how the petroleum system works in Banyumas basin and one step to understanding it better is by studying the paleogeography of Banyumas basin from time by time. Paleogeography means in this sense relates to its position to a magmatic arc. If the position of the basin is in front of a magmatic arc and directly face opening sea, it is called the fore-arc basin.
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