上二叠纪冈瓦纳煤的岩石学和地球化学特征:澳大利亚北悉尼盆地纽卡斯尔煤层

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Geology Pub Date : 2024-10-20 DOI:10.1016/j.coal.2024.104628
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引用次数: 0

摘要

本研究采用综合方法研究了澳大利亚东南部悉尼盆地北部出露的上二叠统纽卡斯尔煤层的有机岩石学和地球化学特征。采集了 27 个煤、煤泥岩和泥岩样本,并采用有机岩石学(宏观组成和玻璃光泽反射率)技术、Rock-Eval 热解、沥青萃取和气相色谱-质谱(GC-MS)进行了分析。研究结果表明,样本具有良好的气源岩潜力,主要含有陆生有机物,海洋生物的贡献有限。大多数样本中都含有胶石和孢石大块矿物质,以及 C27、C28 和 C29 正甾烷的三元图谱,由此可以推断陆生有机物的普遍存在。此外,较低的 C27/C29 比率、C27/(C27 + C29)常规甾烷与 Pr/Ph 比率的交叉图、C27/C29 与 Pr/Ph 比率的交叉图以及 C24 四环/C26 三环萜烷比率也都表明有机物质来源于陆地。沿着 20S/(20S + 20R)与 β/(β + αα) 的交叉图,所获得的玻璃光泽反射率、Tmax、OEP27-31 和 CPI25-33 值表明,样品尚未成熟,埋藏深度较低。所考察的样品表明,这些样品堆积于三角洲平原沉积环境中,处于缺氧/缺氧波动条件下,位于湿润气候区,该气候区的特点是干燥,打断了长期的湿润气候体系。这项研究增加了对悉尼盆地北部源岩潜力的了解,以及对二叠纪-三叠纪重大气候危机前一段时间的环境和气候背景的了解。
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Petrographic and geochemical signatures of the Upper Permian Gondwana coals: Newcastle Coal Measures, Northern Sydney Basin, Australia
This research presents an integrated approach to organic petrographical and geochemical characteristics of the Upper Permian Newcastle Coal Measures outcropping in the northern Sydney Basin, southeast Australia. Twenty-seven coal, coaly mudstone and mudstone samples were collected and analyzed by using organic petrography (maceral composition and vitrinite reflectance) techniques, Rock–Eval pyrolysis, bitumen extraction and gas chromatography - mass spectrometry (GC–MS). The obtained results indicate that the samples exhibit promising gas-prone source rock potential and contain a predominantly terrestrial in origin organic matter, with limited contribution by marine organisms. The prevalence of terrestrial organic matter is inferred by the presence of collotelinite and sporinite macerals in most of the samples and the ternary plot of C27, C28 and C29 regular steranes. Further, the low C27/C29 ratio, the cross-plots of C27/(C27 + C29) regular steranes vs. Pr/Ph ratio, the C27/C29 vs. Pr/Ph and the C24 tetracyclic/C26 tricyclic terpane ratio point also to the terrestrial origin of the organic matter. The obtained values of vitrinite reflectance, Tmax, OEP27–31 and CPI25–33, along the cross plots of 20S/(20S + 20R) versus ββ/(ββ + αα) suggest that the samples are immature and were subjected to a low burial depth. The examined samples indicate accumulation in a delta-plain environment of deposition, under fluctuating oxic/anoxic conditions, in a humid climatic zone that is characterized by dry periods, interrupting the longer-termed humid climatic regime. This research adds knowledge on the source rock potential in the northern Sydney Basin and on the environmental and climatic setting of a time interval just prior to the major Permian - Triassic climatic crisis.
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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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