Geochemical and sedimentary facies study – Implication for driving mechanisms of organic matter enrichment in the lower Silurian fine-grained mudstones in the Baltic Basin (W Lithuania)

Cichon-Pupienis, Anna; Littke, Ralf; Lazauskienė, Jurga; Baniasad, Alireza; Pupienis, Donatas; Radzevičius, Sigitas; Siliauskas, Laurynas

doi:10.1016/j.coal.2021.103815

Cited by 22 publications

(8 citation statements)

References 129 publications

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“…On the contrary, the arid paleoclimate is not conducive to the survival and reproduction of aquatic organisms, which leads to the decline of organic matter abundance. In addition, the paleoclimate has a certain control effect on the input of terrigenous detritus . When the climate is humid, frequent precipitation makes a large number of provenance detritus fill, diluting the organic matter, which results in a less obvious relationship between the paleoclimate and organic matter abundance.…”

Section: Discussionmentioning

confidence: 99%

“…The input of organic matter mainly comes from various aquatic organisms and terrestrial higher plants. The former is the main contributor to organic matter abundance, while the latter provides nutrition for the former. , …”

Section: Discussionmentioning

confidence: 99%

“…In addition, the paleoclimate has a certain control effect on the input of terrigenous detritus. 56 When the climate is humid, frequent precipitation makes a large number of provenance detritus fill, diluting the organic matter, which results in a less obvious relationship between the paleoclimate and organic matter abundance.…”

Section: Influence Of Sedimentary Environment Onmentioning

confidence: 99%

“…The former is the main contributor to organic matter abundance, while the latter provides nutrition for the former. 55,56 5.3.3. Influence of Redox Environment on Organic Matter Enrichment.…”

Section: Influence Of Sedimentary Environment Onmentioning

confidence: 99%

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Geochemistry and Organic Petrology of Middle Permian Source Rocks in Taibei Sag, Turpan-Hami Basin, China: Implication for Organic Matter Enrichment

et al. 2021

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The Taodonggou group of Middle Permian is an important source rock in Taibei sag of Turpan-Hami basin. Due to its deep burial, drilling has only been revealed in recent years. Based on organic petrology and organic geochemistry experiments, this paper studies the organic petrology, organic geochemistry, sedimentary environment, and hydrocarbon generation potential of source rocks in Taibei sag, Turpan-Hami basin, and reveals the influence of the sedimentary environment on the organic matter abundance of source rocks. The results are as follows: (1) The organic matter of the Middle Permian source rocks in Taibei sag of Turpan-Hami basin is mainly sapropelite and exinite. The vitrinite is mainly vitrodetrinite, and the exinite is mainly lamalginiite. (2) The total organic carbon content value is 0.55–6.08 wt %, and the average value is 2.58 wt %. The PG value ranges from 0.78 mg HC/g to 30.86 mg HC/g, and the average value is 4.88 mg HC/g. Chloroform asphalt “A” is 0.046–0.8767 wt %, and the average value is 0.285 wt %. The types of organic matter are mainly III and II–III, and the R o value is 0.628–1.49 wt % (average = 0.988 wt %). The T max distribution is 329–465 °C. The average temperature is 434.7 °C, which is in the mature stage (oil window stage). The Middle Permian source rocks are mainly very good to excellent source rocks with a good hydrocarbon generation potential. (3) The source rocks are deposited in a semihumid and semiarid climate. Organic matter is input as a mixed source. The early and late stages is dominated by terrestrial higher plants. The middle stage is dominated by lower aquatic organisms, and the sedimentary environment consists of weak reduction and weak oxidation environments. (4) In the study area, the abundance of organic matter has a weak negative correlation with CPI and a positive correlation with Pr/Ph and ∑C21–/∑C22+. Under the coaction of paleoclimate, organic matter input, and redox environment, the enrichment model of organic matter with high productivity and weak oxidation environment characteristics can also form excellent source rocks. This study is of great significance and provides theoretical guidance for the exploration of deep oil and gas resources.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Influence Of Sedimentary Environment Onmentioning

confidence: 99%

Section: Influence Of Sedimentary Environment Onmentioning

confidence: 99%

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Geochemistry and Organic Petrology of Middle Permian Source Rocks in Taibei Sag, Turpan-Hami Basin, China: Implication for Organic Matter Enrichment

et al. 2021

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“…The early and late Aeronian positive δ 13 C excursion is documented in the Aeronian (e.g. Melchin and Holmden 2006;Štorch and Frýda 2009;Cichon-Pupienis et al 2021). There are distinguished Kallholn, Valgu, and Sommerodde δ 13 C excursions in the Telychian.…”

Section: Introductionmentioning

confidence: 99%

Stable carbon isotope stratigraphy of the Silurian in the Jočionys-299 borehole (eastern Lithuania)

Balčiūnas¹,

Brazauskas²,

Garbaras³

et al. 2022

EJES

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In recent years it has become commonplace to formalize chemostratigraphic units and identify isotopic zones (chemostratigraphic units) from excursions. Stable carbon isotopes have been used in solving stratigraphic problems in the Silurian for more than 30 years. δ 13 C data supplement other stratigraphic proxies, allowing the subdivision of geological sections and more precise correlation. In this paper we give new δ 13 C data from the Silurian section of the Jočionys-299 borehole, which is located in eastern Lithuania, crossing shallow marine and lagunal deposits. Based on δ 13 C variability, the Ireviken carbon isotope excursion (CIE), the Šlilalė CIE, and probably the Valgu CIE have been identified in the investigated section. The Valgu CIE is linked to the lower part of the Švenčionys Formation. The Ireviken CIE is linked to the upper parts of the Švenčionys Formation and the Paprieniai Formation (rise in δ 13 C values), the Jočionys Formation (moderately stable δ 13 C carb values) and the Verknė Formation (fall in δ 13 C values). A small negative δ 13 C shift is documented in the Pabradė Formation. Chemostratigraphy together with biostratigraphic data allow us to correlate eastern Lithuanian lithostratigraphic units (shallow marine environment) with the global Silurian Geochronological Scale more accurately.

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The heterogeneity of lithofacies types, combination modes, and sedimentary model of lacustrine shale restricted by high‐frequency sequence

Sun

Liu

et al. 2022

Geological Journal

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The second Member of the Funing Formation in the Haian Sag of the Subei Basin is a set of organic-rich fine-grained sedimentary rocks, which is a key interval for shale oil exploration. Under the premise of establishing a high-frequency sequence framework, the fine description of the lithofacies change characteristics of the continental fine-grained sedimentary rocks is the basis for the prediction of shale oil favourable areas and the optimization of the production horizons. This study is established through wavelet transformation of the natural gamma curve of the high-frequency sequence framework of the second Member of the Funing Formation, using thinsection observation, total organic carbon analysis, and X-ray diffraction experiments to study the lithofacies types and characteristics of fine-grained sedimentary rocks, and discuss the combination of lithofacies under the high-frequency sequence framework Mode and influencing factors. The results show that the second Member of Funing Formation is composed of three-level sequence of low-level system tract (LST), transgressive system tract (TST), and early high-level system tract (EHST), corresponding to 6 fourth-level sequences and 10 fifth-level sequences. According to the division scheme of "abundance of organic matter + mineral composition + sedimentary structure", it is found that 12 types of lithofacies were developed in the fine-grained sedimentary rocks of the second Member of Funing Formation. The lithofacies type is affected by the palaeoenvironment. The organic matter facies are mainly controlled by palaeo-water depth and palaeo-redox conditions, the components are mainly controlled by palaeo-water depth and palaeo-salinity, and the tectonic facies are mainly controlled by palaeo-redox and palaeo-salinity. The lithofacies are regularly superimposed in the high-frequency sequence framework, and three combination modes of A, B, and C are developed. Among them, the type A lithofacies are developed in the low-stand system tract, and the type B lithofacies are developed in the transgressive system. The C-type lithofacies assemblage developed near the largest flooding surface and the early highstand system tract, and combined with palaeoenvironment analysis to establish a lithofacies sedimentary model.

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Geochemical and sedimentary facies study – Implication for driving mechanisms of organic matter enrichment in the lower Silurian fine-grained mudstones in the Baltic Basin (W Lithuania)

Cited by 22 publications

References 129 publications

Geochemistry and Organic Petrology of Middle Permian Source Rocks in Taibei Sag, Turpan-Hami Basin, China: Implication for Organic Matter Enrichment

Geochemistry and Organic Petrology of Middle Permian Source Rocks in Taibei Sag, Turpan-Hami Basin, China: Implication for Organic Matter Enrichment

Stable carbon isotope stratigraphy of the Silurian in the Jočionys-299 borehole (eastern Lithuania)

The heterogeneity of lithofacies types, combination modes, and sedimentary model of lacustrine shale restricted by high‐frequency sequence

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