Geochemical characterization of the Jurassic Amran deposits from Sharab area (SW Yemen): Origin of organic matter, paleoenvironmental and paleoclimate conditions during deposition

Hakimi, Mohammed Hail; Abdullah, Wan Hasiah; Makeen, Yousif M.; Saeed, Shadi A.; Al-Hakame, Hitham; Al-Moliki, Tareq; Al-Sharabi, Kholah Qaid; Hatem, Baleid Ali

doi:10.1016/j.jafrearsci.2017.01.009

Cited by 11 publications

(2 citation statements)

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“…Paleoclimate is a crucial determinant in paleoenvironmental evolution, and certain indicators can provide valuable insights [44,63]. For instance, a lower Sr/Cu ratio or higher Fe/Mn and CI values can suggest a shift towards a warmer and more humid climate [64][65][66][67]. Compared with the Lingfeng Formation, the samples in the Yueguifeng Formation are marked by higher values of Fe/Mn and CI, but lower values of Sr/Cu ratios, suggesting a transition from a warm-humid to a relatively arid climate in the Paleocene (66~59.2 Ma, Figures 4e,f and 8h-j).…”

Section: Gc and Gc-ms Analysis Resultsmentioning

confidence: 99%

Paleoenvironmental Evolution and Organic Matter Accumulation in a Hydrocarbon-Bearing Depression in the East China Sea

Zhan,

Liu,

Chen

et al. 2023

JMSE

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Investigating the paleoenvironment and characteristics of source rocks in sedimentary basins is crucial for understanding organic matter accumulation and guiding hydrocarbon exploration. The Lishui Sag, a significant hydrocarbon-bearing depression in the East China Sea, has experienced extensive marine transgression and increasing salinity in the Paleocene, but the changes in accumulation factors of organic matter during this evolution process remain unclear. Through a comprehensive analysis of total organic carbon (TOC), major and trace elements, and biomarker data, this study investigates the characteristics of source rocks from two lithostratigraphic units, namely the Paleocene Yueguifeng and Lingfeng formations, to gain deep insight into the effects of paleoenvironment on organic matter accumulation and hydrocarbon distribution. Our results indicate that the Lishui Sag transitioned from a closed lake to an open-marine environment in the Paleocene, with a shift from warm-humid to arid climate conditions. The biomarker distribution suggests a change in the origin of organic matter, with a higher input of terrestrial organic matter in the Lingfeng Formation. During the early stage, the lacustrine source rocks in the lower Yueguifeng Formation were formed in a relatively humid and anoxic environment within brackish water, resulting in a substantial influx of terrestrial and lacustrine algae organic matter. In contrast, in the late stage, the marine source rocks in the overlying Lingfeng Formation were developed in an arid and oxidizing environment. The lacustrine source rocks in the Yueguifeng Formation were notably more favorable to developing good-quality source rocks. Compared with the other regions, the western and northeastern parts of the study area have greater hydrocarbon generation potential due to the wider distribution of high maturity and organic-rich source rocks, with higher terrestrial and algal organic matter input. Moreover, considering the practical circumstances in the exploration, the northeastern part of the Lishui Sag is recommended as the next exploration target zone.

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Section: Gc and Gc-ms Analysis Resultsmentioning

confidence: 99%

Paleoenvironmental Evolution and Organic Matter Accumulation in a Hydrocarbon-Bearing Depression in the East China Sea

Zhan,

Liu,

Chen

et al. 2023

JMSE

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“…The ratios of Ba/Ti, Rb/Sr, and Sr/Cu in the sediments are sensitive to paleoclimatic changes (Lerman, 1978;Vosoughi et al, 2016). The enrichment of Ga and Rb is related to warm and humid climate (Hieronymus et al, 2001;Ratcliffe et al, 2004;Beckmann et al, 2005;Hikimi et al, 2017) and dry and cold climate conditions (Ratcliffe et al, 2004;Hikimi et al, 2017), respectively. Generally, Sr/Cu value between 1.3 and 5 represent warm and humid climate, while those greater than 5 indicate dry and hot climatic conditions (Lerman, 1978;Vosoughi et al, 2016).…”

Section: Paleoclimate Evolution In High-frequency Sequence Frameworkmentioning

confidence: 99%

Geochemical Characteristics and Sedimentary Control of Pinghu Formation (Eocene) Coal‐bearing Source Rocks in Xihu Depression, East China Sea Basin

Shen

Qin

Cui³

et al. 2021

Acta Geologica Sinica (Eng)

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Offshore large oil and gas fields have been found in many countries, and China has recently achieved noteble breakthroughs in the exploration of oil and gas in the Xihu Depression, East China Sea. The oil and gas in the Xihu Depression is mainly derived from coal-bearing source rocks. Among them, the Pinghu Formation coal-bearing source rocks, with extensive distribution and large thickness, were proven to be the main hydrocarbon source of the oil and gas (Jiang, 2002;

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Sedimentary Environment of the Permian Marine Shale in the Kaijiang‐Liangping Trough, Sichuan Basin, China: Implications for Organic Matter (OM) Accumulation

Gu,

Chen,

Chen

et al. 2024

Geological Journal

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The Permian shales in the Kaijiang‐Liangping Trough within the Sichuan Basin represent a promising frontier for marine shale gas exploration, whereas there has been limited systematic research on their sedimentary environment and organic matter (OM) enrichment mechanisms. Therefore, we present total organic carbon (TOC) analysis, major/trace element analyses and scanning electron microscope experiments for the Permian marine shales from the trough to determine their paleoenvironmental conditions and influencing factors of OM enrichment. The results show that the paleoclimate changed from dry climate to humid and warm climate (P3w1 [the first member of the Wujiaping Formation]) and semi‐humid to semi‐arid climate (P3w2 [the second member of the Wujiaping Formation]) and P3d‐I (Dalong Formation‐I) and then to arid climate again during the shale deposition period from the P2g (Gufeng Formation) to the P3d‐II. The shales with the highest TOC contents (TOC > 3%, P3d‐I and P2g), lower TOC contents (TOC < 1%, P3w1 and P3w2) and higher TOC contents (1% < TOC < 2%, P3d‐II) were formed under the control of anoxic environment and high paleoproductivity, oxic‐suboxic environment and high paleoproductivity, anoxic‐euxinic environment and lower productivity, respectively. Only appropriate sedimentation rates promote OM enrichment. Terrestrial input, paleoclimate, volcanic activity and hydrothermal upwelling mainly indirectly affect OM accumulation by influencing paleoproductivity. The degree of redox conditions is the primary factor affecting OM enrichment, followed by paleoproductivity. Nonetheless, anoxic to euxinic environments are most appropriate for OM preservation. Weak volcanic activity can boost paleoproductivity, but severe volcanic activity might introduce excessive harmful compounds that limit organism survival, resulting in a fall in paleoproductivity. Additionally, element P brought by volcanic ashes doesn't contribute to OM accumulation.

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Geochemical characterization of the Jurassic Amran deposits from Sharab area (SW Yemen): Origin of organic matter, paleoenvironmental and paleoclimate conditions during deposition

Cited by 11 publications

References 47 publications

Paleoenvironmental Evolution and Organic Matter Accumulation in a Hydrocarbon-Bearing Depression in the East China Sea

Paleoenvironmental Evolution and Organic Matter Accumulation in a Hydrocarbon-Bearing Depression in the East China Sea

Geochemical Characteristics and Sedimentary Control of Pinghu Formation (Eocene) Coal‐bearing Source Rocks in Xihu Depression, East China Sea Basin

Sedimentary Environment of the Permian Marine Shale in the Kaijiang‐Liangping Trough, Sichuan Basin, China: Implications for Organic Matter (OM) Accumulation

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