Biomarker evidence for the depositional environment of basinal UK Mississippian mudstones

Geological Society, London, Special Publications Pub Date : 2024-01-12 DOI:10.1144/sp534-2022-225

Michael J. E. Sims, M. Sephton, J. S. Watson, A. J. Fraser, C. H. Vane

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Abstract

The regional character of organic matter type and depositional conditions of Pendleian, Brigantian and Arnsbergian mudstones between the Craven Basin and the Widmerpool Gulf was compared through interpretation of biomarker and pyrolysis data from 201 samples recovered from 9 boreholes. The Carboniferous seaways have been determined to commonly host dysoxic conditions, enabling preservation of a mixture of marine and terrestrial organic matter types. Photic zone anoxia evidenced by aryl-isoprenoids was determined to be persistent during ‘marine’ conditions represented by marine band, high sea level and carbonate facies. Observation and correlation of diasteranes and T s /T m ratios within the samples and to other maturity parameters highlighted a significant clay mineral catalytic and/or hydrocarbon retention effect in the samples. This influenced both biomarkers as well as T max thermal maturity data reducing the reliability of such results in interpreting burial and ultimately reserve potential. Supplementary material at https://doi.org/10.6084/m9.figshare.c.6988037

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英国密西西比泥岩基底沉积环境的生物标志证据

通过对从 9 个钻孔中采集的 201 个样本的生物标记和热解数据进行解释，比较了克雷文盆地和维德默普海湾之间的彭德尔、布里甘特和阿恩斯贝格泥岩的有机物类型和沉积条件的区域特征。经确定，石炭纪海道通常存在缺氧条件，从而能够保存海洋和陆地有机物类型的混合物。以芳基异戊烯酸为证据的光照区缺氧被确定为在以海洋带、高海平面和碳酸盐面为代表的 "海洋 "条件下持续存在。对样本中的二芳香族化合物和 T s /T m 比率以及其他成熟度参数的观察和相关性分析，突出表明样本中的粘土矿物具有显著的催化和/或碳氢化合物滞留效应。这既影响了生物标志物，也影响了最大热成熟度数据，降低了此类结果在解释埋藏和最终储量潜力方面的可靠性。补充材料 https://doi.org/10.6084/m9.figshare.c.6988037

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Geological Society, London, Special Publications

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