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首页> 外文期刊>GSA Bulletin >Coalification patterns of the Pennsylvanian coal measures in the Appalachian foreland basin, western and south-central Pennsylvania
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Coalification patterns of the Pennsylvanian coal measures in the Appalachian foreland basin, western and south-central Pennsylvania

机译：宾夕法尼亚州西部和中南部阿巴拉契亚前陆盆地宾夕法尼亚州煤系的煤化模式

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摘要

Detailed vitrinite reflectance (Ro) profiles have been constructed for nine boreholes penetrating the Pennsylvanian coal measures of the Appalachian foreland basin in western and south-central Pennsylvania. A revised regional coal rank map was compiled with new and pre-existing data. By comparing the calculated Ro profiles with those of measured Ro maximum burial depth, coalification temperature, heat flow, and geothermal gradient were estimated for the coal measures using a one-dimensional transient heat-conductive model combined with the Lopatin-Waples, diagram. The results indicate that increase in coal rank (0.7%-1.9% Ro) and in Ro gradient (0.38%-1.45% Ro/km) across the study area coincides regionally with variation in calculated maximum burial depth (3-5 km), paleotemperature (90-155 °C), paleoheat flow (53 to >75 mW/ m2), and geothermal gradient (26 to >33 °C/ km), and that the region represents different burial and thermal regimes as well as different structural provinces. At the western margin of the Intraplateau Structural Front, coalification continued after the Alleghanian orogeny. Regional geothermal heating due to depositional burial is thought to have been the dominant heat source responsible for the coalification level in the area. Closer to the eastern edge of the Intraplateau Front, both regional geothermal heating due to burial and advective heating due to the fluid flow accompanying the Alleghanian orogeny were important in creating the observed coalification patterns. A higher coal rank and reflectance gradient, together with a concentric isorank pattern centred in northern Somerset County, appear to represent an area where advective heating due to fluid flow was the dominant heat source.
机译：已为西部和南部阿巴拉契亚前陆盆地的9个穿透宾夕法尼亚州煤系的钻孔构造了详细的镜质体反射率（R o ）剖面 。中央 宾夕法尼亚州。使用新的和先前存在的数据编译了修订后的区域煤炭等级图 。通过比较计算出的 R o 轮廓与测得的R o 最大埋藏深度， 煤化温度，热流，并使用一维 瞬态导热模型结合Lopatin-Waples的 图来估算煤层的地热梯度 。结果表明，煤级增加（0.7％-1.9％ R o ）和R o 梯度（0.38％-1.45％R整个研究 区域的 o / km）与计算的最大 埋深（3-5 km），古温度（90-155）的变化在区域上一致。 °C），古热 流量（53至> 75 mW / m 2 ）和地热梯度（26至> 33 °C / km ），并且该区域代表着不同的埋葬 和热力状态以及不同的结构省。 在高原内部结构锋的西边缘， Alleghanian造山运动之后，煤化作用仍在继续。人们认为，由于沉积而造成的区域性 地热 已成为该地区煤化 水平的主要热源。靠近Intraplateau Front的东部边缘，由于埋藏而引起的区域地热加热和由于Alleghanian造山运动伴随的流体流动而产生的对流 加热 在建立观察到的煤化模式方面很重要。 较高的煤等级和反射率梯度，以及以萨默塞特郡北部为中心的 同心等速线模式， 似乎代表了由于流体 流动引起的对流加热是主要热源的区域。

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    《GSA Bulletin》 |1993年第2期|162-174|共13页
  • 作者

    ETUAN ZHANG; ALAN DAVIS;

  • 作者单位

    Energy and Fuels Research Center, 205 Research Building East, Pennsylvania State University, University Park, Pennsylvania 16802;

    Energy and Fuels Research Center, 205 Research Building East, Pennsylvania State University, University Park, Pennsylvania 16802;

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