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首页> 外文期刊>International Geology Review >Natural gas potential of Neoproterozoic and lower Palaeozoic marine shales in the Upper Yangtze Platform, South China: geological and organic geochemical characterization
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Natural gas potential of Neoproterozoic and lower Palaeozoic marine shales in the Upper Yangtze Platform, South China: geological and organic geochemical characterization

机译：华南扬子上平台新元古代和下古生界海相页岩的天然气潜力：地质和有机地球化学特征

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摘要

In this article, we describe the geological features of the Ediacaran (upper Sinian), lower Cambrian and lower Silurian shale intervals in the Upper Yangtze Platform, South China, and report on the gas potential of 53 samples from these major marine shale formations. Reflected light microscopy, total organic carbon (TOC) measurement, Rock-Eval, carbon isotope ratio analysis, thermovaporization gas chromatography (Tvap-GC), and open pyrolysis gas chromatography (open py-GC) were used to characterize the organic matter. Measured TOC in this research is normally >2% and averages 5%. TOC contents are roughly positively correlated with increasing geological age, i.e. lower Silurian shales exhibit generally lower TOC contents than lower Cambrian shales, which in turn commonly have lower TOC contents than Ediacaran shales. Kerogen has evolved to the metagenesis stage, which was demonstrated by the abundant pyrobitumen on microphotographs, the high calculated vitrinite reflectance (R-o=3%) via bitumen reflectance (R-b), as well as delta C-13 of gas (methane) inclusions. Pyrolysates from Tvap-GC and open py-GC are quantitatively low and only light hydrocarbons were detected. The lower Silurian shale generally exhibits higher generation of hydrocarbon than the lower Cambrian and Ediacaran shale. Cooles' method and Claypool's equations were used to reconstruct the original TOC and Rock-Eval parameters of these overmature samples. Excellent original hydrocarbon generation was revealed in that the original TOC (TOCo) is between 5% and 23%, and original S1+S2 (S1(o)+S2(o)) is ranging from 29 to 215mg HC/g rock.
机译：在本文中，我们描述了华南上扬子地台的Ediacaran（震旦纪上），下寒武统和下志留纪页岩层段的地质特征，并报告了来自这些主要海相页岩地层的53个样品的气藏潜力。使用反射光显微镜，总有机碳（TOC）测量，Rock-Eval，碳同位素比分析，热蒸发气相色谱法（Tvap-GC）和开放式热解气相色谱法（open py-GC）来表征有机物。在这项研究中测得的TOC通常大于2％，平均为5％。 TOC含量与地质年龄的增加大致呈正相关，即较低的志留纪页岩通常比较低的寒武纪页岩具有较低的TOC含量，而寒武纪页岩通常比Ediacaran页岩具有较低的TOC含量。干酪根已发展到成矿阶段，显微照片上有大量的焦土，通过沥青反射率（R-b）计算得到的镜质体反射率（R-o = 3％）以及气体（甲烷）夹杂物的δC-13都证明了这一点。 Tvap-GC和开式py-GC的热解产物在数量上较低，仅检测到轻质烃。下部志留纪页岩通常比下部寒武纪页岩和埃迪卡拉纪页岩显示出更高的碳氢化合物生成量。使用Cooles方法和Claypool方程重建这些过早样品的原始TOC和Rock-Eval参数。原始烃的产生极佳，原因在于原始TOC（TOCo）在5％至23％之间，而原始S1 + S2（S1（o）+ S2（o））的范围为29至215mg HC / g岩石。

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