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Coalbed Methane Potential of the Gulf Coast Region

机译：墨西哥湾沿岸地区的煤层气潜力

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Coal beds along the Gulf Coast are Paleocene and Eocene in age and range in rank from lignite to subbituminous at the surface; they probably approach high-volatile A bituminous at depth. Known net coal thickness in the Tertiary Jackson, Claiborne and Wilcox groups ranges from 3-28+ ft (1-9 m). The thickest Jackson and Wilcox Group coals are located in east-central Texas and west-central Louisiana (20+ ft; 6 m). Coal beds in Louisiana and Mississippi tend to be more numerous, but are generally thinner than coal seams in Texas. However, individual coal bed thickness in Louisiana and Mississippi may exceed 20 ft (6 m) in some areas In-place coalbed methane resources for the Gulf Coast region are difficult to assess, given the limited gas content data and published net coal maps. Previous estimates for the coal gas resources for the Tertiary in Texas to depths of 6,000 ft (1,800 m) may have underestimated the amount of gas in place. Accurate assessment of CBM potential requires a regional geologic and hydrologic evaluation of the key factors affecting coalbed methane producibility rather than evaluation of a smaller prospect area. Understanding the synergy among net coal thickness, structural setting, coal rank and gas generation, gas content variability, permeability, and hydrology is critical for delineating the areas of highest coalbed methane potential. Although major oil companies and larger independents conducted the initial coal gas exploration and development, smaller operators will play a progressively more important role in developing this potential resource in the Gulf Coast region.
机译：墨西哥湾沿岸的煤层年龄为古新世和始新世，地层范围从褐煤到表层次烟煤。他们可能在深处接近高挥发性A沥青。第三杰克逊大学，克莱伯恩大学和威尔科克斯大学的已知净煤厚度范围为3-28 +英尺（1-9 m）。 Jackson和Wilcox集团最厚的煤位于得克萨斯州中东部和路易斯安那州中西部（20英尺以上； 6 m）。路易斯安那州和密西西比州的煤层往往更多，但通常比德克萨斯州的煤层薄。但是，在路易斯安那州和密西西比州，某些地区的单个煤层厚度可能会超过20英尺（6 m），鉴于天然气含量数据有限和已发布的净煤图，因此难以评估墨西哥湾沿岸地区的就地煤层气资源。以前对德克萨斯州第三纪大学6,000英尺（1,800 m）深度的煤气资源的估计可能低估了已到位的天然气量。准确评估煤层气潜力需要对影响煤层气生产能力的关键因素进行区域地质和水文评估，而不是对较小的勘探区进行评估。了解净煤厚度，结构设置，煤阶和瓦斯产生，瓦斯含量变异性，渗透率和水文学之间的协同作用对于确定煤层气最高潜力地区至关重要。尽管主要的石油公司和较大的独立公司进行了初期的天然气勘探和开发，但较小的运营商将在开发墨西哥湾沿岸地区的这一潜在资源中发挥越来越重要的作用。

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