地表地球化学是了解地质复杂地区石油系统的关键--波兰外喀尔巴阡山脉

IF 3.7 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Marine and Petroleum Geology Pub Date : 2024-10-15 DOI:10.1016/j.marpetgeo.2024.107155

Anna Twaróg , Krzysztof Starzec , Henryk Sechman , Wojciech Schnabel

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引用次数: 0

摘要

这项研究的目的是调查喀尔巴阡山脉褶皱和推力带构造复杂地区的土壤气体成分与地质构造之间的关系。在波兰外喀尔巴阡山脉中部的两个主要构造单元--马古拉单元和前马古拉单元群--进行了地表地球化学勘测，目的是确定土壤气体样本的分子和同位素组成。该地区的构造结构有许多变形，如褶皱、推力和走向滑动断层，并伴有宽阔的混合区。地表地球化学调查结果显示，外喀尔巴阡山脉各构造单元内记录的碳氢化合物微浓度存在显著差异。总烷烃 C2-C5 的显著高浓度主要记录在 MDTW 中，尽管总烷烃值在 Window 中的分布与地层的排列以及断层和推力的走向密切相关。一般来说，MDTW 内的封隔作用不足以支持具有常规经济价值的油气聚集的存在。我们的数据证实了马古拉单元在喀尔巴阡山石油系统中的密封作用。因此，在马古拉单元覆盖之下的前马古拉组中可能存在碳氢化合物源（即潜在的碳氢化合物积聚）。我们的研究结果对于解释其他地质结构复杂的油气省份的地表地球化学数据也具有重要意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Surface geochemistry as a key to understanding the petroleum system in regions of complex geology - Polish Outer Carpathians

The goal of the study is to investigate the relationships between soil gas composition and geological structures in a structurally complex area of the Carpathian fold and thrust belt. Surface geochemical surveys, aimed at determining the molecular and isotopic composition of soil gas samples, were carried out in the central part of the Polish Outer Carpathians in two major tectonic units, the Magura Unit and the Fore-Magura Group of units, which outcrop at the front of the former and within it as a tectonic window (the so-called Mszana Dolna Tectonic Window, MDTW). The tectonic structure of the area has numerous deformations, such as folds, thrusts, and strike-slip faults, that are accompanied by broad zones of mélange. In all 572 soil gas samples, the concentrations of light alkanes, gaseous alkenes as well as non-hydrocarbon (e.g. hydrogen) components were determined, and part of the samples were analysed to test the carbon isotope composition of methane and carbon dioxide.

The results of the surface geochemical survey showed significant differences in the recorded microconcentrations of hydrocarbons within the tectonic units of the Outer Carpathians. Significantly higher concentrations of total alkanes C₂-C₅ were mainly recorded in the MDTW, although the distribution of total alkane values within the Window shows strong connections with the arrangement of strata and the strike of faults and thrusts. Generally, the sealing is insufficient within the MDTW to support the existence of conventional economically viable hydrocarbon accumulations. Our data confirms the sealing role of the Magura Unit in the Carpathian oil system. Therefore, hydrocarbon sources (i.e. potential hydrocarbon accumulations) may be expected within the Fore-Magura Group beneath the cover of the Magura Unit.

Our results are also of key importance for the interpretation of surface geochemistry data in other oil and gas provinces with a complex geological structure.

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来源期刊

Marine and Petroleum Geology 地学-地球科学综合

CiteScore

8.80

自引率

14.30%

发文量

475

审稿时长

63 days

期刊介绍： Marine and Petroleum Geology is the pre-eminent international forum for the exchange of multidisciplinary concepts, interpretations and techniques for all concerned with marine and petroleum geology in industry, government and academia. Rapid bimonthly publication allows early communications of papers or short communications to the geoscience community. Marine and Petroleum Geology is essential reading for geologists, geophysicists and explorationists in industry, government and academia working in the following areas: marine geology; basin analysis and evaluation; organic geochemistry; reserve/resource estimation; seismic stratigraphy; thermal models of basic evolution; sedimentary geology; continental margins; geophysical interpretation; structural geology/tectonics; formation evaluation techniques; well logging.