#TITLE_ALTERNATIVE#

• Main Author: ANDRIAN TAMPUBOLON (NIM: 12009080); pembimbing: Dr. Ir. Yan Rizal Dip. Geol, RICKY
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/19306
• Institution: Institut Teknologi Bandung

The research area is located on Gumelar Subdistrict, Banyumas Regency, Central Java Province. Geographycally, the area is located at 274282 – 279313 mE and dan 9178139-9181493 mN (UTM WGS 84 zone 49S), approximately 16.87 km2. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> The Geomorphological unit within research area categorized to Complex Structure Hills Unit. Stratigraphy of the research is divided into three units from oldest to youngest, Sandstone-Claystone unit, Breccia unit, and Claystone-Sandstone Unit. Geological structures in research area are strike-slip fault with northeast-southwest, northwest-southeast, and north-south direction, also thrust fault and fold with northwest-southeast direction. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> Facies associations of Sandstone-Claystone Unit in the research area are: Basin Plain, Channel-overbank, Channel-fill, Frontal Splay, and Crevasse Splay. While facies associations in Claystone-Sandstone Unit are: Sand flat, Mixed Flat, dan Mud Flat. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> Diagenesis of channel-fill at Halang Formation showed diagenesis processes of compaction, cementation, recryztallization, and dissolution which formed secondary porosity. Based on observation from thin sections, this facies association is difficult to be reservoir. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> Distribution of alteration in the research area are facilitated by geological structure with presence of secondary mineral such as smectite, sericite, and calcite which followed by ore mineral like gold, pyrite, chalcopiryte, and arsenopyrite.