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据美国天然气研究所分析,美国西部的致密含气砂层、东部的泥盆系含气页岩、煤层和地质静压带中蕴藏着大量的不能用常规方法开采的天然气。到1990年,通过采用先进技术,每年可从致密砂层、泥盆系页岩和煤层中开采到425～539亿立方米的非常规天然气。假设改进开采工艺技术获得成功,而且不受到需要量、资本、劳动和设备的限制,到2000年这种天然气的产量将猛增到
According to the analysis of the US Natural Gas Research Institute, a large amount of natural gas that can not be mined by conventional methods is contained in dense gas sands in the western United States, Devonian gas-bearing shale in the east, coal seams and geological hydrostatic zones. By 1990, 425 to 539 billion cubic meters of unconventional natural gas could be mined annually from tight sand, Devonian shale and coal seams by adopting advanced technologies. Assuming a successful mining process improvement and no restrictions on demand, capital, labor and equipment, the output of such natural gas will soar by the year 2000