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![Facies classification. Frontal Splay 1 facies Association which signed by red boxes [8,9].](publication/317700818/figure/fig13/AS:507437054521344@1497993829352/Facies-classification-Frontal-Splay-1-facies-Association-which-signed-by-red-boxes-8-9.png)
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![Figure 2. Stow Facies Classification [8].](publication/317700818/figure/fig1/AS:507437048397824@1497993828469/Stow-Facies-Classification-8_Q320.jpg)
![Figure 3. Regional Stratigraphic of Central Java (modified from [1]).](publication/317700818/figure/fig2/AS:507437048647680@1497993828498/Regional-Stratigraphic-of-Central-Java-modified-from-1_Q320.jpg)
![Figure 4. Stratigraphy of Pangkalan Area [13].](publication/317700818/figure/fig3/AS:507437050077184@1497993828565/Stratigraphy-of-Pangkalan-Area-13_Q320.jpg)
The Halang formation had been exposed continuously in Pangkalan river, Banyumas Basin. Detailed stratigraphic studies by which using measuring section method was performed on Halang formation which found along Pangkalan river. The facies of Halang formation based on sedimentological study can be divided into five facies association, namely with: pr...
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... 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. ...
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.
In determining reservoir geometry, an understanding of the extent of facies association is needed. The Halang Formation results from turbidite deposition with many lithological variations and is seen as a potential reservoir. The problems that arise in the geometry of turbidite sedimentary rocks are very complex and depend on the history and depositional environment. Banyumas Regency was chosen as the research location, precisely in several Subdistricts, such as Ajibarang, Wangon, and Gumelar. The focus of this study is to determine the variation of turbidite facies and identify the potential for reservoirs of deep marine sediment. Retrieval of data with measurable stratigraphic detail is a method of data collection in the field, also enhanced by laboratory analysis, such as petrography,
micropaleontology, and routine core analysis. The lithology of the Halang Formation in the study area is dominated by intertwining sandstone and siltstone or siltstone with tuff and carbonate properties. The results of the Halang Formation turbidite deposition found in the study area can be concluded deposited on the fan tongue system (lobes) that forms deep-sea fans, starting the Upper Fan and Suprafan Lobes on Middle Fan in the Channeled to Smooth - Smooth Potion of Supra fan Lobes. Compilation with previous studies shows that the source of the Halang Formation comes from the south of the research area. From core routine analysis, porosity and permeability can be calculated from each sandstone sample which can then be classified as good or bad quality of the petrophysical properties of these rocks. The Halang Formation at the study site has sufficient porosity quality as a reservoir.
Banyumas basin is one of sedimentary basin in Central Java. Based on surface geological mapping we can found many turbidite sediment in this area. Turbidite sediment is a sedimentary rocks with certain sedimentary structure such as graded bedding, paralel lamination, cross lamination or wavy lamination. Turbidite sediment formed by turbidity current which is caused by the existing of a slope. Several depositional environment which is have a slope can be a candidate as depositional environment of turbidite sediment in Banyumas Basin. Previous researcher always refer it to submarine fan depositional environment, because it is believed that Banyumas is a deep marine in the past time. But in the recent research, we found a buried volcanic arc in the middle of Banyumas Basin, that means there are several volcano formed at the middle of sea in the past time. Turbidity current cause by the slope of volcano’s flank not the submarine slope. So the new paradigm to understanding the turbidite sediment in Banyumas Basin is Flysch and molasse turbidite sediment. Flysch is a turbidite sediment related to an orogenic process or the birth of a volcano, and molasse is a turbidite sediment related to reworked process of a volcano, such as weathering, erosion, transportation and then re-sedimentation.
