Pustaka Ilmiah Universitas Padjadjaran

Abstrak

The Tectonic Controls On Coal Bed Methane Potential In Berau Basin, NE Kalimantan , Indonesia

The Berau Basin is one of several major coal basins in Northeast Kalimantan. Tectonically, this basin was controlled by regionally NW trending transform system and was initiated with the formation of the Sulawesi Sea rifting of the north and west Sulawesi from East Kalimantan which work from Middle Eocene to Recent. Tectonic development in the basin occurred during three periods: i.e., Middle Eocene to Early Miocene rift tectonics, Middle –Late Miocene basin subsidence and gravity induced listric faulting, and Pliocene to Recent are reactivation transform movement along the wrench fault crossing the Makasar Straits. The small-displacement strike-slip tectonic zones are boundary of some of the Coal mines in the Berau Basin. Special attention needs to be given to analysis of local tectonic-and-structural regimes affecting coalbed methane resource assessments. Permeability and patterns and, more specifically, lateral variations of methane content in coal beds are very important for the CBM reservoir which are critically depend upon present stress-state state and spatial distribution of local extension – compression domains. It looks that the CBM compartments, which tend to occur at relatively high permeability compartments, are typically structurally controlled by releasing bends or dilation jog located along strike-slip tectonic zones.