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Anthracite: A Potentially Significant Producer of Coalbed Methane

机译：无烟煤：潜在重要的煤层气生产商

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Until the last several years, coal of anthracite frank was not believed to be an attractive target for coalbed methane exploration. Reasons for negative arguments include the commonly held perception that (1} because anthracitization results from high temperatures, any remaining volatile constituents should have been "cooked" out of the coalbed reservoir; and (2) anthracites often lack cleating and exhibit other attributes that result in very low permeability. However, anthracite often is very brittle, can exhibit excellent cleating, and is known to develop reasonably good permeability. Furthermore, it has been demonstrated that this very high rank coal is characterized by extremely high sorption capacities and can act as a very efficient "sponge" that is able to store methane that originated from nearby sources, including secondary biogenic gases. Published examples of measured (desorbed) gas contents in anthracite deposits in North America are as high as 500-600 standard cubic feet per short ton (scf/st). Elsewhere, gas contents have been measured in South Wales (U.K.) at more than 800 scf/st, in northwestern Germany at nearly 800 scf/st, and in China (Shanxi Province) as high as 1367 scf/st. In northeastern Pennsylvania, a test well drilled in the Anthracite Region in the mid-1970s flowed 85 Mcf/d (unstimulated) from a bed below 1,500 ft. In the Jincheng coal-mining district in southeastern Shanxi Province, China, commercial rates of coalbed methane production are being tested from several wells. Other anthracite deposits that may warrant exploration include those in north-central British Columbia, South Wales and the Asturias region of northern Spain.
机译：直到最近几年，无烟煤煤一直被认为不是煤层气勘探的有吸引力的目标。产生负面论据的原因包括普遍认为：（1）由于无烟化是由高温引起的，任何残留的挥发性成分均应从煤层储层中“煮熟”；以及（2）无烟煤通常缺乏解理并表现出其他属性然而，无烟煤通常很脆，显示出良好的解理性，并具有相当好的渗透性，此外，已经证明这种高品位煤具有极高的吸附能力，可以用作一种非常有效的“海绵”，能够储存源自附近气体的甲烷，包括次生生物气体北美无烟煤矿床中已测量（解吸）气体含量的公开示例高达每短短500-600标准立方英尺在其他地方，测得的天然气含量在英国西南威尔士（英国）西北部的Ger超过800 scf / st。许多以近800 scf / st的速度运行，在中国（山西省）则高达1367 scf / st。在宾夕法尼亚州东北部，无烟煤地区钻探的一口测试井是在1970年代中期从1500英尺以下的层中以85 Mcf / d（未增产）流动的。在中国山西省东南部的晋城煤矿区，煤层的商业价格为几口井正在测试甲烷的生产。其他可能需要勘探的无烟煤矿床包括不列颠哥伦比亚省中北部，南威尔士和西班牙北部阿斯图里亚斯地区的那些。

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