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Dumex Pasaribu
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THE The Samarinda Anticline: Surface Field Study At Sungai Siring, Samarinda, East Kalimantan Dumex Pasaribu; Fikri Mustabidin; Epo Prasetya Kusumah
JURNAL TEKNOLOGIA Vol 3 No 2 (2021): Jurnal Teknologia
Publisher : Aliansi Perguruan Tinggi Badan Usaha Milik Negara (APERTI BUMN)

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Abstract

This research was conducted in the Sungai Siring area, Samarinda, East Kalimantan and geographically located at 117 ° 13'19.44 "- 117 ° 17'52.19" E and 0 ° 23'53.58 "- 0 ° 27'13.91" S with a research area of ​​about 50 km2. The aim of this paper is to report data from surface study and hoped that this data can provide additional data to explain the process the forming of Samarinda Anticline. The data used in this paper were obtained from lineament analysis on the Digital Elevation Model (DEM) data and the results of geological mapping in the Sungai Siring area including outcrop observations, measurement of stratigraphic section, and measurement of geological structure data. According to the result of this study, the formation of structure in the research area begins with the compression force with the main stress trending southeast (SE) - northwest (NW) which causes the formation of an thrust fault as a blind fault which then accommodates the layer above it to fold in the late Miocene age when the Sandstone - Claystone units and Coal insert Sandstone units was deposited. Geological section restoration was carried out using the line length method in four section, the results of the restoration in the study area generally had a shortening of 11% - 43% (843 - 2831 meters), contraction ratio are 0.57 - 0.89, strain are 0.11 - 0.43, and the depth to detachment are 3816 - 5984 meters. The greater of the shortening causes the depth to detachment to be shallower and the folds that are formed are tighter than the smaller shortening. Keywords: Sungai Siring, Samarinda Anticline, Restoration
Structure Evolution and Palinspastic Analysis of The Gurami-Tamiang Area, North Sumatra Basin, Indonesia Dumex Pasaribu; Benyamin Sapiie; Indra Gunawan
Scientific Contributions Oil and Gas Vol 48 No 3 (2025)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v48i3.1806

Abstract

The Sumatran back-arc basins developed beginning in the Middle Eocene, characterized by a variety of graben alignment patterns, which serve as critical indicators in understanding their formation history. One such basin is the North Sumatra Basin, dominated by north-south-trending grabens. These grabens are best observed in the Gurami-Tamiang Area. This research focuses on the subsurface analysis of this area, specifically: (i) detailed seismic interpretation of four east-west cross-sections that span several grabens, and (ii) palinspastic reconstructions to investigate structural and strain evolution over time, and its tectonochronostratigraphic chart. Generally, the structural configuration of the Gurami-Tamiang Area is defined by half-grabens bounded by east-dipping faults originating from negative flower structures at depth. The results show three phases of evolution: (i) Extensional Phase (45 - 32 Ma) is characterized by growth strata and strain magnitudes of (+) 4.2% to (+) 11.64%, (ii) Transitional Phase (32 - 22 Ma) is displaying both positive and negative strains of (+) 2.3% to (-) 1.7%,  with growth strata that are extending across grabens; and (iii) Contractional Phase (22 Ma – present) is characterized by negative strains of (-) 0.92% toward zero and mostly covered by post-extensional and syn-inversion deposits. The evolutionary phases indicate a novelty in the area, with the graben formation being part of a wrench fault system that includes the Khlong-Marui Fault, the Lokop-Kutacane Fault, and the Sumatra Fault.
Co-Authors Benyamin Sapiie Epo Prasetya Kusumah Fikri Mustabidin Gunawan, Indra