Publications

The research area is Wonosegoro, Boyolali District, Central Java. This area is located at the north of the Southern Mountain which is the main depocenter of the North East Java basin. The research area includes the Kendeng Zone, which is a volcanoclastic-loaded 8,000 metre thick basin. Kendeng Zone is a back arc basin formed by tectonic activity resulting in a fold-thrust belt ranging from west to east. Therefore, it is important to explore this frontier area further as a potential hydrocarbon basin. Methods used in this research are: surface geological mapping, measuring stratigraphy, laboratory analysis including petrography, granulometry, rock porosity and permeability. The main object of this paper is the Kerek formation which is assumed to have potential capacity as reservoir and is portrayed as deep water sediment. Additional focus on classification of submarine fan channels based on their quality as reservoirs is also provided. Submarine fan channels have high heterogeneity in terms of architecture and reservoir quality which is controlled by fluid flow as an agent of sedimentation and transportation. This paper evaluates the correlation between the type of channel and its quality as a reservoir in Kendeng Zone specifically and deep marine sediment globaly. The results show that the variation of reservoir quality of submarine fan channels is highly controlled by factors such as sorting of matrix and grain size distribution, both of which will affect rock porosity and permeability significantly. The sediment with the best quality as a reservoir is grain flow sediment with average porosity of 19.12% and permeability of 868.72 mD. Second best is low density turbidite with average porosity of 14.61% and permeability of 541.83 mD. The lowest quality is debrite sediment with average porosity of 10.93% and permeability of 204.01 mD. Keywords : Kendeng Zone, Kerek Formation, Physical Properties