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首页> 外文期刊>Petroleum frontiers >Coalbed Methane Prospects of the Tyonek Formation, Onshore Northern Cook Inlet Basin, South-Central Alaska
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Coalbed Methane Prospects of the Tyonek Formation, Onshore Northern Cook Inlet Basin, South-Central Alaska

机译：阿拉斯加中南部北部库克湾陆上盆地Tyonek组煤层气前景

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The Cook Inlet Basin of south-central Alaska is a forearc basin containing an estimated 1.5 trillion tons of coal in place. This coal was deposited mostly within the fluvial to tidal facies of the Tertiary Kenai Group. The most prospective coals for coalbed methane (CBM) in the Tyonek Formation are the bituminous rank coals within the onshore portion of the northern Cook Inlet. These Tyonek coals occur in single beds up to 50 ft thick and have a net strati-graphic thickness of hundreds of ft―all at depths of less than 6,000 ft. Adsorption isotherm and measured gas content data indicate that the coalbeds are generally gas-saturated. Published estimates show that the northern Cook Inlet contains about 500 billion tons of bituminous coal above a depth of 10,000 ft. Canister desorption data, mostly from measured onshore well samples, indicate that these bituminous coals have a gas content averaging about 230 standard cu ft per ton (scf/ton) on a dry, ash-free (daf) basis. The significant potential of the bituminous coals of the onshore portion of Cook Inlet Basin is indicated by the estimated 3.6 trillion cu ft (Tcf) of CBM in place within the 72,000-acre Pioneer Unit alone. Subbituminous coal in the onshore portion of the Cook Inlet Basin (based on onshore well samples) contains an average of about 60 scf/ton (daf) and is now thought to be gas-saturated. Published estimates indicate about one trillion tons of subbituminous coal in place throughout the Cook Inlet Basin. In 2001, considering both bituminous and subbituminous rank coal across the entire Cook Inlet Basin, the Gas Technology Institute indicated that there are about 245 Tcf of CBM in place. Compared with other CBM productive basins, the Tyonek coal has a comparable gas content, a relatively shallow depth to coal, and a generally thicker net coal section-all in close proximity to a major gas pipeline. However, previous attempts at producing these favorable prospects have been unsuccessful. The lack of success is attributed to formation damage during drilling and completion and/or failure to adequately dewater the coalbed as required for significant CBM production.
机译：阿拉斯加中南部的库克湾盆地是一个前陆盆地，估计有1.5万亿吨煤炭就位。这些煤大部分沉积在第三纪奈集团的河流相至潮相相内。 Tyonek组中煤层气（CBM）中最有前景的煤是库克湾北部陆上部分的沥青级煤。这些Tyonek煤存在于厚度最大为50英尺的单人床中，净地层厚度为数百英尺-所有深度都在6,000 ft以下。吸附等温线和测得的气体含量数据表明，煤层通常为气体饱和的。已公布的估算显示，北部库克湾入口处10,000英尺深处约有5,000亿吨烟煤。罐解吸数据（主要来自于测得的陆上井样品）表明，这些烟煤的气体含量平均为每立方英尺230标准立方英尺。吨（标准立方英尺/吨），以干燥，无灰（daf）为基准。库克湾盆地陆上部分烟煤的巨大潜力，仅在72,000英亩的先锋部队内部就已经估计有3.6万亿立方英尺（Tcf）的煤层气，就表明了这一点。 Cook Inlet盆地陆上部分的次烟煤（基于陆上油井样品）平均约60 scf /吨（daf），现在被认为是天然气饱和的。已公布的估计数字表明，整个库克湾流域约有1万亿吨次烟煤。在2001年，考虑到整个Cook Inlet盆地的烟煤和次烟煤，瓦斯技术研究所指出，大约有245 Tcf的煤层气存在。与其他煤层气生产盆地相比，Tyonek煤具有可比的瓦斯含量，与煤相比相对较浅的深度以及通常较厚的净煤段（均靠近主要天然气管道）。但是，先前产生这些有利前景的尝试并未成功。缺乏成功的原因是钻井和完井过程中地层损坏和/或未能按照大量煤层气生产所需对煤层充分脱水。

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