Abstract
A detailed stratigraphy description and measurements of the sedimentary facies within the Halang Formation has been carried out to provide a thorough assessment of the architectural facies and depositional environment. The study area is located along the Tajum River in the District of Gumelar, Banyumas, Central Java-Indonesia where most of the Halang Formation is preserved in a good condition. Three cycles of facies association from basin plain, in channel to channel overbank deposits were able to be determined from the formation which indicate very active changes of sub-depositional environment that related to transgressive response influenced by the local tectonic during sedimentation takes place.
Highlights
The stratigraphy of the study area follows the stratigraphy of the Majenang area (Kastowo & Suwarna, 1996)
The area is underlain by the deep marine to transitional sediments which belong to Halang Formation, Kumbang Formation and Tapak Formation
Based on Stow classification (1985), the Halang Formation exposed in the study area is divided into more detailed facies (Table 2)
Summary
The stratigraphy of the study area follows the stratigraphy of the Majenang area (Kastowo & Suwarna, 1996). The Halang Formation is a turbidite deposit formed in the fore arc basin (Ardenta et al 2016) at the time of the Miocene. This formation has a wide spread in Java, especially in Central Java (Praptisih and Kamtono, 2011; Ardenta, et Al, 2016; Rizal, et Al, 2016; Rizal et Al, 2017) and some in West Java (Abdurrokhim, et al, 2017). Identification of the body shape of the deep marine deposits in turbidite facies is very important especially with regard to the determination of the geometry of a reservoir. The problem that arises is the geometry of deep marine deposits in these turbidite facies is very complex and varied, and its existence depends on how, when, and the type of depositional environment (Slatt, 2003)
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