PERHITUNGAN SUMBERDAYA BATUBARA SEAM - Z BERDASARKAN DATA PEMBORAN DAN LOG GEOFISIKA DENGAN METODE CIRCULAR USGS DI WILAYAH KONSESI PT. BUMI MURAU COAL KAVLING 3 FORMASI WAHAU, KABUPATEN KUTAI TIMUR, PROPINSI KALIMANTAN TIMUR

Abstract

Along with the development period and technology, coal as an alternative energy to natural oil and gas, more attractive so the public demand for coal is increasing as well. Coal resource calculation is done to determine the amount of existing coal resource in region Muara Wahau, East Kalimantan. Research in PT. Bumi Murau Coal aims to identify the coal spreading pattern based on geophysical log data and bore log; and also know about the amount of existing coal resource in research area, especially Seam Z. The research methods of this final project are survey method, descriptive method and extended with analyze method. Analyze method was done by several steps. The first steps is correlation construction between bore hole to determine subsurface lithology sequence also coal spreading and step of coal bed map construction. Continued with quantitative analyze method that is calculation of coal Seam Z resource by using the combination grid method and Circular USGS method. There are 16 bore holes in research area, divided to 5 drilling lines. Seam Z is not found at 2 bore holes. Seam Z has thickness about 23 – 37 meters. The pattern of coal Seam Z thickness is thicker to southwest side. The depth of Seam Z is about 18 – 77 meters above sea level. Seam Z is occurred in almost of entire research area that spreads from southeast to northwest well continuously. Based on the class of resource according to USGS classification, Seam Z in research area can be divided in 2 class, measured coal that has distance of circular radius 0 – 400 meters and indicated coal that has distance of circular radius 400 – 1200 meters. Whereas the amount of Seam Z resource that has been calculated by Circular USGS method, measured coal in the amount of 193.556.553,77 ton and indicated coal in the amount of 130.216.320,5 ton.