Constraints of C–O–Sr isotope and elemental geochemistry on the origin of dolomite of the deeply buried Ediacaran sedimentary succession, central Sichuan Basin (SW China)

Li, Y.-Z.; Liu, Guangdi; Song, Zezhang; Sun, Min; Tian, Xiaobo; Yang, Dedong; Wang, Yunlong; Zhu, Lei; You, Fuliang

doi:10.1016/j.jseaes.2023.105780

Journal of Asian Earth Sciences

2023

DOI: 10.1016/j.jseaes.2023.105780

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Constraints of C–O–Sr isotope and elemental geochemistry on the origin of dolomite of the deeply buried Ediacaran sedimentary succession, central Sichuan Basin (SW China)

Y.-Z. Li

Guangdi Liu

Zezhang Song

et al.

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2024

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Cited by 2 publications

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“…At the same time, it can also be determined by correlating the burial thermal history with the homogenization temperature (Th) of the inclusions(Bourdet et al, 2010). Previous studies have extensively investigated the Th in the Deng-4 Member of the Gaoshiti-Moxi area(Li et al, 2023), and these studies showed that the minimum Th is approximately 115 C, which is in good agreement with the burial and thermal evolution history of the source rocks (Figure5). Therefore, ca.…”

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Reconstruction of palaeo‐oil reservoirs in the ultra‐deep and over‐mature Sinian Dengying Formation of the Central Sichuan Basin: Insights from basin and petroleum system modelling

Li,

Liu,

Song

et al. 2024

Geological Journal

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Ultra‐deep Sinian carbonate rocks are rich in natural gas, and the Deng‐4 Member of the Central Sichuan Basin has been shown to have an extremely high degree of thermal evolution. They are characterized by dry gas produced due to the thermal cracking of palaeo‐oil reservoirs (PORs). The distribution of PORs as materials for the formation of cracked gas reservoirs remains unclear. The complex multistage evolution process and limited drilling data make it challenging to precisely and systematically recover a range of PORs. Based on basin and petroleum system modelling (BPSM), the bottom‐up migration and accumulation method was used to investigate the distribution of PORs. Research shows that the PORs in the Sinian Deng‐4 Member were mainly formed in the Early–Middle Triassic under the mixed contribution of Cambrian and Sinian source rocks, and the coupling of palaeostructural and trap settings controlled its accumulation. Generally, the distribution of PORs can be divided into two categories: one is located at the core of the uplift zone and is controlled by structural‐stratigraphic composite traps, whereas the other is controlled by a series of lithologic traps formed in the slope area. Sensitivity analysis showed that the distribution patterns of the PORs were mostly related to the facies conditions (physical characteristics) of the reservoirs. The widely distributed PORs provide necessary and sufficient material conditions for the formation of cracked Sinian gas reservoirs in the Central Sichuan Basin, and the North Slope area has great potential for natural gas exploration in the future.

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confidence: 61%

Reconstruction of palaeo‐oil reservoirs in the ultra‐deep and over‐mature Sinian Dengying Formation of the Central Sichuan Basin: Insights from basin and petroleum system modelling

Li,

Liu,

Song

et al. 2024

Geological Journal

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Lithofacies and diagenetic controls on thrombolitic dolomite reservoir development from the Precambrian Dengying Formation in the central Sichuan Basin, SW China

Li,

Zhang,

Zhou

et al. 2024

Front. Earth Sci.

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Microbialite reservoirs are of great importance in oil and gas exploration. However, there is still a lack of comprehensive studies on the formation mechanisms of thrombolitic reservoirs, a specific type of microbialite. This research focuses on the oldest thrombolitic dolomite reservoir located within the Precambrian Dengying Formation in the central Sichuan Basin, southwestern China. A multi-disciplinary approach was employed to characterize different thrombolite facies and elucidate the formation mechanism of thrombolitic dolomite reservoirs and their controlling factors, involving core observation, thin-section analysis, cathodoluminescence, scanning electron microscope (SEM) microscopy, elemental analysis using LA-ICP-MS, and carbon and oxygen stable isotope analysis. Based on variations in texture, four types of thrombolite were identified: 1) distinct clotted thrombolite, 2) diffuse and regular clotted thrombolite, 3) diffuse and irregular clotted thrombolite, and 4) composite clotted thrombolite. Notably, the diffuse clotted thrombolitic dolomite is the prevalent lithology in the reservoir. Through modification by meteoric water, organic acid fluids, and hydrothermal fluids, a reservoir with dominant porosity in the form of primary growth-framework pores, dissolution pores, and vugs was formed. This resulted in the development of two high-quality reservoir intervals within the Second Member and at the top of the Fourth Member of the Dengying Formation. The growth-framework porosity of the thrombolites, epigenetic karstification, and tectonic fracturing were mainly conducive to reservoir development. However, various types of cementation have reduced porosity and connectivity within the reservoir. Overall, this study is a valuable example of the methodology required to understand meso- and microstructures of deep-buried thrombolitic dolomite reservoirs, including their heterogeneities and diagenesis, as the original structures influence diagenesis.

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Constraints of C–O–Sr isotope and elemental geochemistry on the origin of dolomite of the deeply buried Ediacaran sedimentary succession, central Sichuan Basin (SW China)

Cited by 2 publications

References 81 publications

Reconstruction of palaeo‐oil reservoirs in the ultra‐deep and over‐mature Sinian Dengying Formation of the Central Sichuan Basin: Insights from basin and petroleum system modelling

Reconstruction of palaeo‐oil reservoirs in the ultra‐deep and over‐mature Sinian Dengying Formation of the Central Sichuan Basin: Insights from basin and petroleum system modelling

Lithofacies and diagenetic controls on thrombolitic dolomite reservoir development from the Precambrian Dengying Formation in the central Sichuan Basin, SW China

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