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Drimane-type compounds in source rocks and fluids from fluvial-deltaic depositional settings in the North-West Shelf of Australia
Organic Geochemistry ( IF 3 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.orggeochem.2017.11.012
Jaime Cesar , Kliti Grice

Abstract Fluvial-deltaic petroleum systems with gas-prone source rocks are difficult to assess because the released fluids generally lack biomarkers and this limits the implementation of traditional organic geochemistry screening. However, there are a number of compound classes yet to be investigated in order to establish novel parameters for correlation studies in fluvial-deltaic geological settings. In this study we have focused on drimane-skeleton molecules (C15-decalins), particularly the compounds 1,2,2,5,5-pentamethyl-trans-decalin and 1,1,2,5,5-pentamethyl-trans-decalin (termed herein as rearranged drimanes RD1 and RD2, respectively) and drimane (D), in source rock extracts and fluids from fluvial-deltaic petroleum systems in the Carnarvon Basin, North-West Shelf of Australia (NWS). We have calculated the ratio (RD1 + RD2)/D as proposed by Ji et al. (Ji, L., He, C., Zhang, M., Wu, Y., Li, X. [2016]. Bicyclic alkanes in source rocks of the Triassic Yanchang Formation in the Ordos Basin and their inconsistency in oil-source correlation. Marine and Petroleum Geology 72, 359–373) and compared their results with samples from the NWS. Our compilation of rearranged drimane ratios for a variety of lithologies suggests clay-catalysed rearrangement of C15-decalins in siliciclastic source rocks from fluvial-deltaic depositional environments. Therefore, the mineral content seems to be a key factor controlling the isomerisation of decalins. Samples with higher clay content, such as claystone from the Brigadier Formation, have higher (RD1 + RD2)/D ratios (∼6) and higher C29 diasterane/C29 sterane (∼1.1) compared to silty claystone from the Legendre Formation (∼2 and ∼0.8 respectively). The effects exerted by thermal maturity of the source rock and redox conditions of the depositional environment require further investigation, although samples from the Yanchang Fomation and La Luna Formation, where deposition occurred under more reducing conditions, exhibit lower rearranged drimane ratios (

中文翻译:

来自澳大利亚西北陆架河流-三角洲沉积环境的烃源岩和流体中的 Drimane 型化合物

摘要 含气源岩的河流三角洲油气系统难以评估,因为释放的流体通常缺乏生物标志物,这限制了传统有机地球化学筛选的实施。然而,为了在河流三角洲地质环境中为相关性研究建立新的参数,还有许多化合物类别有待研究。在这项研究中,我们专注于 drimane 骨架分子(C15-十氢化萘),特别是化合物 1,2,2,5,5-五甲基-反式十氢化萘和 1,1,2,5,5-五甲基-反式-来自澳大利亚西北大陆架 (NWS) Carnarvon 盆地的河流-三角洲石油系统的烃源岩提取物和流体中的十氢化萘(本文分别称为重排 drimanes RD1 和 RD2)和 drimane (D)。我们已经计算了 Ji 等人提出的比率 (RD1 + RD2)/D。(姬丽, 贺成, 张美, 吴艳, 李鑫 [2016]. 鄂尔多斯盆地三叠系延长组烃源岩中的双环烷烃及其油源不一致性[J].相关性。海洋和石油地质学 72, 359–373) 并将他们的结果与来自 NWS 的样本进行了比较。我们对各种岩性的重排 drimane 比率的汇编表明,在来自河流三角洲沉积环境的硅质碎屑烃源岩中,粘土催化了 C15-十氢化萘的重排。因此,矿物质含量似乎是控制十氢化萘异构化的关键因素。粘土含量较高的样品,例如来自 Brigadier 地层的粘土岩,具有较高的 (RD1 + RD2)/D 比 (~6) 和更高的 C29 二甾烷/C29 甾烷 (~1. 1) 与来自勒让德组的粉砂质粘土岩相比(分别为~2 和~0.8)。烃源岩的热成熟度和沉积环境的氧化还原条件所产生的影响需要进一步研究,尽管来自延长组和拉鲁纳组的样品在更多还原条件下沉积,显示出较低的重排三烷比率。
更新日期:2018-02-01
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