Cleat Development in Some British Columbia Coals
نویسنده
چکیده
Many coal seams contain coalbed methane (CBM) yet most of the world’s production comes from the San Juan Basin in the United States. In fact CBM production from this basin of about 0.9 tcf/yr accounts for about 80% of the CBM production in the US (1.2 tcf/yr) and about 60% of world production. Success in the San Juan Basin is not because of increased gas content in the coals compared to coals in other basins, rather it is because of permeability. Permeability of CBM through coal seams is generally the most important coal seam property affecting the viability of a CBM field and it is controlled mainly by the degree of cleat development. Cleats are orthogonal closely spaced tension fractures characteristic of coal seams and their importance in controlling permeability in coal seams is documented and discussed in numerous papers.
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