Petrographic characteristics of selected tertiary coals from Western Indonesia according to their geological ASPECTS

Abstract

Selected Tertiary coals from the western part of Indonesia (Sumatera, Kalimantan and Java) indicate similarities and differences in type and rank characteristics. These coals reflect their geological setting, particularly for intrusive and stratigraphic aspects. Type and rank of the coals were assessed by petrographic examination. The coals are mainly dominated by vitrinite, common liptinite and rare inertinite and mineral matter. Vitrinite macerals are dominated detrovitrinite and telovitrinite. Resinite, cutinite and suberinite are the dominant liptinite macerals in the coals. Inertinite macerals in the coals consist of semifusinite, sclerotinite and inertodetrinite. The type differences largely reflect climatic influence and differences in peat conditions. In spite of short geological history, the coals exhibit variable vitrinite reflectances. The high vitrinite reflectance of the coals is a result of higher regional coalification levels in the basins associated with greater cover and effects of igneous intrusions.Keywords: coal, maceral, type, rank, western Indonesia. ABSTRAK Percontoh-percontoh batubara yang terdapat di Indonesia bagian barat (Sumatera, Kalimantan dan

Effect of Depositional Environment and Climate on Organic Matter Enrichment in Sediments of the Upper Miocene—Pliocene Kampungbaru Formation, Lower Kutai Basin, Indonesia

“…Specifically, as the vitrinite content increases, there is a corresponding decrease in the proportions of both liptinite and inertinite. This inverse correlation indicates a consistent trend wherein a higher vitrinite content is associated with lower levels of liptinite and inertinite within the coal samples [48][49][50].…”

“…Specifically, as the vitrinite content increases, there is a corresponding decrease in the proportions of both liptinite and inertinite. This inverse correlation indicates a consistent trend wherein a higher vitrinite content is associated with lower levels of liptinite and inertinite within the coal samples [48][49][50]. The total organic carbon (TOC) content exhibits a positive correlation with clay mineral content (r 2 = 0.73) (Figure 10A) while displaying a negative correlation with quartz content (r 2 = 0.38) within the organic-rich non-coal (Figure 10B) samples.…”

The Role of Organic Sulfur in the Formation of Methane Emissions on the Spontaneous Combustion of Coal

“…Previous research in the TAL area was dominated by low rank coal, namely sub-bituminous and relatively few high rank coal, such as: low volatile bituminous and medium volatile bituminous [Santoso, 2017]. Maceral analysis shows that the low rank coal formed is dominated by huminite (34.6-94.6 vol.%), slightly sulfide minerals (0-2 vol.%), and kaolinite.…”

Pengaruh intrusi terhadap lapisan batubara E (Keladi) Formasi Muara Enim, Sub-cekungan Palembang Selatan, Sumatera Selatan

“…Hampir seluruh batubara Neogen di Indonesia mempunyai kalori rendah, termasuk batubara di Cekungan Sumatera Selatan, khususnya dalam Formasi Muara Enim, berumur Miosen-Pliosen, kecuali di beberapa daerah yang terpengaruh intrusi batuan beku, seperti batubara di Bukit Asam (Lapangan Air Laya, Suban dan Bukit Kendi), Tanjung Enim (Susilawati dan Ward, 2006;Susilawati dkk., 2013;Santoso, 2015Santoso, , 2017. Kinhill-Otto Gold (1986) dalam Salinita dan Purnama (2014) menyatakan bahwa batubara tambang Banko Barat di Tanjung Enim umumnya memiliki kandungan abu rendah dengan rata-rata 6,3% (db) dan kandungan sulfur rendah sampai sangat rendah dengan rata-rata 0,42% (db).…”

“…Selain itu, didukung oleh peneliti lain yang menyebutkan bahwa batubara di beberapa lokasi di Tanjung Enim mempunyai nilai kalori tinggi (antrasit), seperti dinyatakan oleh Amijaya dan Littke (2006); Susilawati dan Ward (2006); Santoso (2015Santoso ( , 2017. Batubara bituminus yang dipengaruhi oleh pengaruh struktur geologi diketemukan juga di Kalimantan Timur, tepatnya di daerah Samarinda bagian utara dan Sangatta dengan peringkat batubara bituminus (Advanced Resources International, 2003).…”