通过将有机地球化学、有机岩石学和热建模相结合,了解晚古生代克拉罗梅柯前陆盆地(阿根廷冈瓦纳西南部)的埋藏历史和碳氢化合物潜力

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
María Belén Febbo , Silvia Omodeo-Salé , Andrea Moscariello
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引用次数: 0

摘要

克拉罗梅柯前陆盆地(石炭纪-二叠纪;阿根廷布宜诺斯艾利斯省南部)是了解冈瓦纳西南边缘古构造演化的关键,与能源资源勘探息息相关。这项研究通过整合地球化学数据、有机岩石学和热建模技术,重建了克拉罗梅柯盆地的热和埋藏史。研究了 Tunas Formation(Pillahuincó 组,早二叠世)的岩心样本。研究人员构建了一维热模型,用玻璃光泽反射率测量值(VRo %)进行了校准,并与之前研究中的流体包裹体和磷灰石裂变轨迹数据进行了印证。Rock-Eval热解结果显示,总有机碳(TOC)%值从0.13到60.35 wt%不等。氢指数(HI <;50 毫克 HC/g TOC)和氧指数(OI <;50 毫克 CO2/g TOC)表明,III 型和 IV 型岩化物占主导地位,很可能是原始 III 型岩化物热成熟的结果。岩石学观察结果证实了惰性岩类矿物以及少量玻璃岩和锂辉石的存在。最高温度范围主要在 460 至 610 ℃ 之间。VRo % 值在 1.5 至 2.0% 之间。地球化学数据与 VRo % 测量结果相结合,证实了煤炭和富含有机质地层在从湿气到干气窗口内的晚期成因到元气成因阶段。为了制约盆地充填的热演化,通过改变热流以及与盆地隆起和侵蚀(二叠纪-新生代不整合)相关的缺失断面厚度,对不同情况进行了测试。在下二叠统-下白垩统期间,侵蚀厚度为 3000 米至 4200 米,古热流峰值为 60 或 80 mW/m2 时,校准结果最佳。图纳斯地层沉积和埋藏于二叠纪-三叠纪(冈瓦纳造山运动阶段),最高温度达 180 °C。结合地球化学分析、有机岩石学和热模型技术得出的结果表明,图纳斯地层的煤层目前有可能成为易生天然气的源岩。尽管如此,由于残留(IV 型)角质的比例较高,目前煤层的碳氢化合物生成能力较低。进一步的研究可以帮助澄清,这些源岩可能排出的碳氢化合物是由于迁移而流失,还是被困在盆地的某个地方。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Understanding the burial history and the hydrocarbon potential of the late Paleozoic Claromecó foreland Basin (Southwestern Gondwana, Argentina) by combining organic geochemistry, organic petrology, and thermal modeling

The Claromecó foreland Basin (Carboniferous–Permian; southern Buenos Aires province, Argentina) is key to understanding the paleotectonic evolution of the southwestern Gondwana margin and is relevant to energy resource exploration. This study reconstructs the thermal and burial history of the Claromecó Basin by integrating geochemical data, organic petrology, and thermal modeling techniques. Cores samples of the Tunas Formation (Pillahuincó Group, Early Permian) were studied. A 1D thermal model was constructed, calibrated with vitrinite reflectance measurements (VRo %), and corroborated with fluid inclusion and apatite fission track data from previous studies. Rock-Eval pyrolysis results show TOC% values ranging from 0.13 to 60.35 wt%. The Hydrogen index (HI < 50 mg HC/g TOC) and Oxygen index (OI < 50 mg CO2/g TOC) indicate the dominance of Type III and Type IV kerogens, most likely resulting from the thermal maturation of an original Type III kerogen. Petrologic observations confirm the presence of macerals from the inertinite group, as well as minor amounts of vitrinite and liptinite. The Tmax displays a temperature range mostly from 460 to 610 °C. The VRo % values range from 1.5 to 2.0%. Geochemical data combined with VRo % measurements confirm a late catagenesis to metagenesis stage within the wet to dry gas window for coals and organic-rich strata.

In order to constrain the thermal evolution of the basin infill, different scenarios were tested by varying the heat flow and the missing section thickness associated with the uplift and erosion of the basin (Permian–Cenozoic unconformity). The best calibration results were obtained with an erosion thickness of 3000 up to 4200 m and paleo heat flow peaks of either 60 or 80 mW/m2 during the Lower Permian–Lower Cretaceous. The Tunas Formation was deposited and buried during the Permian–Triassic (Gondwanides Orogeny phase), reaching a maximum temperature of 180 °C. The results obtained by combining geochemical analysis, organic petrology, and thermal modeling techniques indicate that the coal beds of the Tunas Formation could have a current potential as gas-prone source rocks. Despite that, the hydrocarbon generation capacity of coal levels is currently low due to the high percentage of residual (Type IV) kerogen. Further research could help clarify if the hydrocarbons potentially expelled by these source rocks have been lost due to migration or could be trapped somewhere in the basin.

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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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