Depositional conditions, wildfires, maturity, and hydrocarbon potential evaluation of Central Carpathian Paleogene Basin based on integrative approach from Orava Basin

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS International Journal of Coal Geology Pub Date : 2024-03-13 DOI:10.1016/j.coal.2024.104490
Dorota Staneczek , Dariusz Więcław , Leszek Marynowski
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Abstract

Central Carpathian Paleogene Basin (CCPB, Central Western Carpathians) comprises mainly Oligocene clastic autochthonous age-equivalents of the widely known Menilite shale formation from the Outer Carpathians. However, little is known about the paleoenvironment and its subsequent changes during the basin's evolution. Furthermore, the available hydrocarbon potential data are based on anachronous methods and are not investigated on the sub-basin level. Gas chromatography-mass spectrometry (GC–MS) analyses supported by Rock-Eval data along with petrographic measurements enabled us to identify and document the paleoenvironmental evolution of the Orava sub-basin (NW remnant of CCPB). Thermal maturity based on vitrinite reflectance, 22S/(22S + 22R) homohopane ratio and 20S/(20S + 20R) sterane ratio increases from N to S and from Upper to Lower Oligocene. In the least mature samples ββ-hopanes, hopenes, and oleanenes are present, whereas in the most mature deposits less thermally stable compounds dissapeared. This maturation trend is shown also by the Rock-Eval data. Terrestrial organic matter input is documented by the predominance of III- and II/III-type of kerogen and the occurrence of several biomarkers, such as 3,3,7-trimethyl-1,2,3,4-tetrahydrochrysene, cadalene, retene, and perylene. The significant contribution of polycyclic aromatic hydrocarbons (PAHs) may be linked with wildfire-related land degradation and following runoff to the basin. Based on the measured fusinite reflectance values the wildfire types could range from hotter crown fires to colder surface fires. Depositional conditions in Lower Oligocene units are characterized by intermittent euxinia, as derived from small (<5 μm) pyrite framboid diameters and the presence of isorenieratane. Subsequently, a change of conditions to oxic/dysoxic in younger units is observed, and the input of terrestrial organic matter increased.

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基于奥拉瓦盆地的综合方法评估喀尔巴阡山中古近纪盆地的沉积条件、野火、成熟度和碳氢化合物潜力
中喀尔巴阡山古近纪盆地(CCPB,中西喀尔巴阡山脉)主要由外喀尔巴阡山脉广为人知的梅尼利特页岩层的渐新世碎屑岩自生时代等同物组成。然而,人们对该盆地演化过程中的古环境及其随后的变化知之甚少。此外,现有的碳氢化合物潜力数据是基于过时的方法得出的,并没有在次盆地层面进行调查。气相色谱-质谱法(GC-MS)分析得到了岩石评价数据和岩相测量数据的支持,使我们能够确定并记录奥拉瓦子盆地(中央盆地西北部残余)的古环境演变。根据玻璃光泽反射率、22S/(22S + 22R)均质烷比率和 20S/(20S + 20R)立体烷比率得出的热成熟度从北到南,从上新世到下新世逐渐升高。在最不成熟的样本中存在ββ-蒎烷、蒎烯和齐墩果烯,而在最成熟的矿藏中,热稳定性较低的化合物消失了。岩石评价数据也显示了这种成熟趋势。陆地有机物的输入主要体现在 III 型和 II/III 型角质层以及一些生物标志物,如 3,3,7-三甲基-1,2,3,4-四氢菊烯、蒈烯、芸苔烯和苝。多环芳烃(PAHs)的大量存在可能与野火导致的土地退化以及随后流入盆地的径流有关。根据测得的燧石反射率值,野火类型可能包括较热的树冠火和较冷的地表火。下渐新世单元的沉积条件以间歇性蚀变为特征,这可以从黄铁矿框胞直径较小(<5 μm)和异菱锰矿的存在中推测出来。随后,在较年轻的单元中观察到条件变为缺氧/缺氧,陆地有机物的输入增加。
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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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