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Berita Sedimentologi
Published by Forum Sedimentologiwan Indonesia
ISSN : 08539413     EISSN : 2807274X     DOI : https://doi.org/10.51835/bsed
Core Subject : Science,
Earth & Planetary Sciences
BERITA SEDIMENTOLOGI aims to disseminate knowledge on the field of sedimentary geology to its readers. The journal welcomes contributions in the form of original research articles, review articles, short communications and discussions and replies. Occasionally, Berita Sedimentologi also includes field trip reports and book reviews, which are published only after going through peer-review processes. The main geographical areas of interest are Indonesia and SE Asia, however contribution from the rest of the world is also welcome. Berita Sedimentologi covers broad topics within sedimentary geology, particularly on depositional processes and their records in the rocks, petrology, sedimentology and stratigraphy of both siliciclastic and carbonate rocks; sequence stratigraphy, paleontology, biostratigraphy and sedimentary geochemistry. The journal also accepts articles on interdisciplinary research in sedimentary basin analysis, including large-scale basin geodynamics processes, mechanism of sedimentary basin formation, earth surface processes, sediment routing systems, petroleum geoscience and applied sedimentary geology analysis for mining and engineering geology.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 2 Documents
 1 
Search results for , issue "Vol 39, No 1 (2017)" : 2 Documents clear
Sangatta Delta Evolution with an Updated Miocene Paleogeography Purnama A. Suandhi; A. Bachtiar; Prihatin T. Setyobudi; Endi Nurjadi; Andi Mardianza; B. Dody Harisasmita; M. Arifai; Dwi Hendro H. N
Berita Sedimentologi Vol 39, No 1 (2017)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2271.798 KB) | DOI: 10.51835/bsed.2017.39.1.87

Abstract

The Sangatta Delta is one of significant deltas which developed during Miocene in the northern part of Kutai Basin. Significant hydrocarbons and coals have been produced from Middle – Lower Miocene fluvio-deltaic sediments along the onshore – offshore parts of the Lower Kutai Basin since 1970 until present. The Sangatta Delta’s architecture was already published since 1994 based on subsurface data around the Sangatta Field. However, information on stratigraphy and sedimentological model only covered the Middle – Lower Miocene sections and there were no publication of its complete stratigraphy succession for more than 15 years.Recently, many road accesses have been developed, connecting villages and districts around Kutai Timur Regency. Most of the roads cut across perpendicularly to stratigraphy strikes measured from surface outcrops, including Miocene Section. Integrated surface geological study by using continuous measurement sections along the road accesses was used in generating composite, Miocene stratigraphic columns, which display information of stratigraphy, facies succession and paleogeography of Miocene deposits. Evolution of Sangatta Delta was interpreted by using chronostratigraphy built from outcrops observation.The Sangatta Delta development was controlled by Rantau Pulung – Mangkupa paleohigh (Rantau Pulung Island), which is bound by NE-SW and N-S strike slip faults system called Bengalon – Batuampar Slip Faults (NE-SW) and Rantau Pulung – Himba Lestari Slip Faults (N-S). Those faults represent old basement faults that were reactivated several times during Neogene time and they controlled the accommodation space and structural development around the Sangatta Delta.The delta development started in Early Miocene when at least two fluvial deltaic parasequence sets prograded toward east. During that time, the Rantau Pulung island was an exposed area, surrounded by marine environment. The delta continued to develop and became larger during Middle – Late Miocene as regional inversion and uplift took place at Kuching High to the west of the delta. More than ten stacking fluvial deltaic parasequence sets have been identified from stratigraphic composite columns and they all show progradation toward east. The stratigraphy deposited by the Early – Late Miocene progradation cycles could become new exploration targets around the Sangatta area, especially deep Neogene target or deepwater plays related to deltaic environment in distal facies area.
A Study of Neogene Sedimentary Outcrops of the Greater Miri Area - Can Clay Gouging Be Calibrated in Outcrops and Shallow Subsurface Boreholes? Franz L. Kessler; John Jong
Berita Sedimentologi Vol 39, No 1 (2017)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3133.194 KB) | DOI: 10.51835/bsed.2017.39.1.86

Abstract

The greater Miri area offers particularly well-exposed world-class examples of fault geometry and clay gouging. Such information offers good material for studying fault architecture and clay smear morphology, and help to understand fault seal mechanisms in the subsurface. Recent studies on fault and clay gouging in the Neogene sedimentary rocks of greater Miri area show a variety of fault geometries of both abrasive-type and shear-type. In a Nippon Oil-sponsored study carried out in Curtin University, fifteen (15) core holes were drilled through clay-gouged fault planes at three outcrop locations. Cores of the formation were taken, and the drilled holes were then pressurized by water injection for packer testing. The performed leak-off test results were somewhat surprising - weathered Neogene sediments of the Miri and Tukau formations offered little or no pressure retention in fault zones and host rock alike, and leak-off fracturing occurs already at 1.25 bar. The rock mechanics of weathered rock might be very different from fresh rock, and may offer little or no insight into those of virgin rocks. Therefore, weathered rock properties may not be suitable for subsurface fault seal simulation studies.

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