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首页> 外文期刊>Petroleum frontiers >A First Report of Significant Coalbed Methane Production from a Paleozoic Coal, Kerr Basin, West-Central Texas
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A First Report of Significant Coalbed Methane Production from a Paleozoic Coal, Kerr Basin, West-Central Texas

机译：德克萨斯州中西部克尔盆地古生代煤大量生产煤层气的第一份报告

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摘要

Coalbed methane production was reported in 2002 from a 25-ft thick coal and carbonaceous shale zone that contains 14 ft of net coal from 2270 to 2295 ft in the Rendova Loretta 1 well in the Kerr Basin, west-central Texas. The coal contains 140 standard cu ft of gas/ton (as received basis) and, when flow-tested, produced as much as 210 mcf/d of gas. The gas is composed of 96 mol-% CH_4, 2.5 mol-% N_2, 0.6 mol-% CO_2, and traces of C_2 to C_6 alkanes. Regional correlations and palynology indicate a Permian (Wolf-campian) age for the coal zone. Maceral analysis of a composite core sample from the coal zone indicates that the coal bed is composed of about 86% vitrinite, 10% inertinite and 4% liptinite with a coal rank of high-volatile B bituminous and a moderate to low grade of 37 wt.-% ash yield (dry basis) and 2 wt.-% moisture (as received basis). During flow testing, after one week of pumping out the acid- and fracture-treatment water, the main coal zone immediately produced gas, indicating that the coal is likely saturated with gas. This well is believed to be the first coalbed methane test that has produced a significant―and a likely profitable―natural gas volume from a Paleozoic coal in Texas. The results suggest coalbed methane or gas shale potential may be present in the Pennsylvanian to Permian strata of the tectonically related Val Verde and perhaps the Marathon and Marfa foreland basins.
机译：据报道，2002年在得克萨斯州中西部的Kerr盆地的Rendova Loretta 1井中，有一个25英尺厚的煤和碳质页岩带，煤层气产量为14英尺，净煤量为2270至2295英尺，其中煤层气产量为14英尺。煤炭每吨含气140标准立方英尺（按收货计算），经流量测试，产生的天然气高达210 mcf / d。气体由96摩尔％CH_4、2.5摩尔％N_2、0.6摩尔％CO_2和痕量的C_2至C_6烷烃组成。区域相关性和孢粉学表明了该煤层的二叠纪（Wolf-campian）年龄。对来自煤层的复合岩心样品的宏观分析表明，煤层由约86％的镜质体，10％的惰质体和4％的锂质体组成，煤级为高挥发性B烟煤，中低品位为37 wt -。％灰分产率（干基）和2 wt .-％水分（以接收量计）。在流量测试期间，在抽出酸和压裂处理水一周后，主煤层立即产生了天然气，表明煤很可能被天然气饱和。据信，这口井是第一个从得克萨斯州的古生代煤中产生了可观且可能盈利的天然气的煤层气测试。结果表明，在构造相关的瓦尔佛得角的宾夕法尼亚至二叠纪地层中可能存在煤层气或页岩气，也许还有马拉松和马尔法前陆盆地。

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