Coal Properties and Cleat Attributes at Tanjung Enim Coalfield in South Palembang Sub-basin, South Sumatra
| Main Authors: | Jati, Stevanus Nalendra, Sutriyono, Edy, Hastuti, Endang Wiwik Dyah |
|---|---|
| Format: | Proceeding eJournal |
| Terbitan: |
, 2019
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| Online Access: |
https://zenodo.org/record/3592810 |
Daftar Isi:
- Observation on the Tanjung Enim coal outcrops has been conducted to evaluate coal and cleat characteristics, particularly those occurring at Suban and Air Laya Putih (ALP) sites. Tectonically, the region is located in the South Palembang Sub-basin. In this region, there are four to five coal seams dipping to the SW direction. The dips of coal beds in ALP are commonly steeper than those in Suban, implying that the ALP seams had been more deformed tectonically and hence underwent more shortening. The samples analyzed reveal that the coals are medium in rank with the ash content relatively constant along strike, but distinctive vertically. Most seams have high values of inherent moisture, fixed carbon, and volatile matter. Deformation of the seams has resulted in two types of fractures known as face and butt cleats. The present study employed a scanline method to measure cleat attributes such as spacing, aperture, and bedding orientation. A total of 3,241 face and butt cleats were measured from 12 scanlines. The face cleats predominantly have NNE-SSW orientation, suggesting paleostress direction. The general trend of butt cleats is NW-SE, likely coincident with the releasing stresses. Face cleats have spacing and aperture more tightly than butt cleats. This suggests that face cleats developed in response to the maximum stresses, and butt cleats formed due to the minimum in situ stresses. Scanning Electron Microscope (SEM) analysis revealed that microcleats in seam show a number of apertures that were connected to form a network system within the analyzed samples.