渤海湾盆地南浦凹陷1号构造带古近系沉积物有机-无机综合地球化学特征及其有机质成因意义

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemistry-Exploration Environment Analysis Pub Date : 2020-10-05 DOI:10.1144/geochem2019-060

Yu Guo, W. Gang, G. Gao, Shangru Yang, C. Jiang, Guo Chen, Chuanzhen Zhu, Xiaofeng Li, Yifan Wang, Yue-xia Dong, K. Goldberg

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引用次数: 1

摘要

古近系沉积物，特别是东营组第三段（Ed3）和沙街组第一、三段（Es1、Es3），已被认为是南浦凹陷最重要的烃源岩。通过对91个泥岩样品的有机和无机分析，包括岩石蒸发热解、气相色谱-质谱和元素地球化学，重建了古气候、古盐度和古氧化还原条件等古环境条件，识别了有机质的来源。结果表明，Es3的TOC含量高于Es1和Ed3。碳氢化合物成因潜力（S1 + S2）表明了良好的碳氢化合物潜力。Ed3和Es1烃源岩的干酪根类型为II1–II2型，而Es3烃源岩以II2–III型干酪根为主。烃源岩的生物标志物和无机地球化学指标，如Pr/Ph、V/（V + Ni）和Cu/Zn表示沉积期间在低氧到缺氧条件下具有淡水到微咸水的湖泊环境。Ed3烃源岩的特征是低G/C30H（gamacerane/C30hopane）（0.1）、TT/C30H和S/H，低Pr/Ph和C24TeT/C23TT，典型的藻类和陆地高等植物的混合输入，具有藻类优势。Ed3、Es1和Es3烃源岩大多沉积在半干旱至湿热气候条件下，平均温度高于15°C。这项研究表明，合适的温度、新鲜到微咸的湖泊环境和低氧到缺氧的条件可以导致高有机物浓度和保存，从而为形成高质量的烃源岩提供先决条件。补充材料：表S1–S3可在https://doi.org/10.6084/m9.figshare.c.5227684

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An integrated organic–inorganic geochemical characterization of Paleogene sediments in No.1 Structural Belt of the Nanpu Sag, Bohai Bay Basin, eastern China: implications for the origin of organic matter

Paleogene sediments, especially the third member of the Dongying Formation (Ed3) and the first and third members of the Shahejie Formation (Es1 and Es3), have been regarded as the most important source rocks in the Nanpu Sag. Organic and inorganic analyses, including Rock-Eval pyrolysis, gas chromatography-mass spectrometry, and element geochemistry, in 91 mudstone samples, were used to reconstruct the palaeoenvironmental conditions, such as palaeoclimate, palaeo-salinity and palaeo-redox conditions, and to recognize the origin of organic matter. The results show that Es3 has a higher TOC content than Es1 and Ed3. Hydrocarbon genetic potential (S1 + S2) of the samples indicate fair to good hydrocarbon potential. The kerogen type of Ed3 and Es1 source rocks are Type II1–II2, while Es3 source rocks are dominated by Type II2–III kerogens. Biomarkers and inorganic geochemical indicatives of source rocks, such as Pr/Ph, V/(V + Ni) and Cu/Zn, indicate a lacustrine environment with fresh to brackish water under suboxic to anoxic conditions during deposition. Ed3 source rocks are characterized by low G/C30H (gamacerane/C30hopane) (<0.1), TT/C30H (tricyclic terpane/C30hopane) and S/H (serane/hopane), high Pr/Ph (pristane/phytane) and C24TeT/C23TT (C24tetracyclic terpane/C23tricyclic terpane), indicating mixed input of both algae and terrestrial higher plants, dominated by terrestrial higher plants. Es1 source rocks display medium G/C30H, TT/C30H, S/H, Pr/Ph and C24TeT/C23TT, indicative of a mixed input of both algae and terrestrial higher plants. Es3 source rocks are characterized by high G/C30H (>0.1), TT/C30H and S/H, low Pr/Ph and C24TeT/C23TT, typical of a mixed input of algae and terrestrial higher plants, with algal dominance. Ed3, Es1 and Es3 source rocks were mostly deposited in semi-arid to humid-warm climate conditions, with an average temperature higher than 15°C. This study suggests that suitable temperatures, a fresh to brackish lacustrine environment and suboxic to anoxic conditions could result in a high organic matter concentration and preservation, thus providing prerequisites for the formation of high-quality source rocks. Supplementary material: Tables S1–S3 are available at https://doi.org/10.6084/m9.figshare.c.5227684

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来源期刊

Geochemistry-Exploration Environment Analysis 地学-地球化学与地球物理

CiteScore

3.60

自引率

16.70%

发文量

审稿时长

1 months

期刊介绍： Geochemistry: Exploration, Environment, Analysis (GEEA) is a co-owned journal of the Geological Society of London and the Association of Applied Geochemists (AAG). GEEA focuses on mineral exploration using geochemistry; related fields also covered include geoanalysis, the development of methods and techniques used to analyse geochemical materials such as rocks, soils, sediments, waters and vegetation, and environmental issues associated with mining and source apportionment. GEEA is well-known for its thematic sets on hot topics and regularly publishes papers from the biennial International Applied Geochemistry Symposium (IAGS). Papers that seek to integrate geological, geochemical and geophysical methods of exploration are particularly welcome, as are those that concern geochemical mapping and those that comprise case histories. Given the many links between exploration and environmental geochemistry, the journal encourages the exchange of concepts and data; in particular, to differentiate various sources of elements. GEEA publishes research articles; discussion papers; book reviews; editorial content and thematic sets.