Sweet Spots Selection of Low-Abundance Coalbed Methane Reservoir

DOI: 10.14800/IOGR.1156

Abstract

Low abundance coalbed methane reservoirs are characterized by low abundance, unclear factors affecting gas well productivity, and strong heterogeneity. These characteristics make the development of gas reservoirs difficult. The study is based on well logging interpretation and the guidance of the gas well production capacity against these difficulties. Using methods of the gas reservoir production characteristics analysis and numerical simulation, the relationships among the low abundance of CBM reservoir production well productivity, reserves abundance, main coal desorption pressure, interlayer interference, and continuous water drainage, were studied. Studies have shown that the main controlling factors of low abundance of CBM are block construction factors, resource abundance and gas saturation. The study also confirmed that 2# coal seam is not suitable for mining with the main coal seam, and 6# coal seam in some areas is suitable for mining with the main coal seam. This method is highly targeted, has a strong production basis and high reliability based on the current production situation of the block.