Origin and significance of carbonate shoal depositional cycles: A case study of the Cambrian Longwangmiao Formation, Sichuan Basin, SW China

Yang, Wendong; Li, Pingping; Chen, Haoru; Liang, Zheng; Lan, Caijun; Xu, Zhehang; Lu, Chaojin; Zou, Huayao

doi:10.1016/j.jseaes.2022.105083

Cited by 7 publications

(2 citation statements)

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“…Interpretation: The dominance of mud and the presence of scattered angular silty quartz grains with silty and argillaceous laminae point to a lower-energy depositional setting adjacent to the paleohighs [54]. The occurrence of silt-bearing argillaceous dolostone with silty and argillaceous laminae as interbedded thin layers in TFA5, TFA6 and TFA10 indicates that F5 was deposited in a low-energy, tidal flat environment [55] or restricted lagoonal environment [56].…”

Section: Argillaceous Dolostone (F5)mentioning

confidence: 99%

“…Micritic fabric and silt-sized to sand-sized dolomite grains commonly filling ooid cortices, concentric laminae and nuclei are likely the result of diagenetic alteration (burial dolomitization) of primary minerals [59,60], which started with an initial precipitation along the grain periphery and was subsequently followed by dolomite precipitation along the porous cortical laminae [33,61]. The common presence of varied medium to coarse sand-sized grainstones and the vertical superpositions of oolites with high amounts of ooids, dolarenite, thrombolites and algal lumps indicate that F6 was deposited in a high-energy shoal environment [33,42,54,56,62]. Notably, the presence of all the ooids is not indicative of a high-energy sedimentary environment.…”

Section: Dolograinstone (F6)mentioning

confidence: 99%

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Facies, Depositional Environment and Reservoir Quality of an Early Cambrian Carbonate Ramp in the Tarim Basin, NW China

Zhu¹,

Zheng²,

Zhang

et al. 2023

Minerals

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The Xiaoerbulake Formation in the Tarim Basin is considered one of the most important deep to ultradeep hydrocarbon reservoirs in the world. The objective of the present study is to analyze the facies, depositional environment and reservoir quality of the Early Cambrian Xiaoerbulake Formation in the Tarim Basin through integrated analysis of 120 m of cores, 3240 m of well cuttings, wireline logs and over 1100 thin sections from 17 exploration wells. Early Cambrian Xiaoerbulake Formation deposits in the Tarim Basin were deposited on a ramp setting. The ramp was occupied by seven facies associations and ten facies types ranging from the inner ramp to the outer ramp. These facies associations include tidal flat, lagoon, high-energy shoal, sabkha, inter-shoal, low-energy shoal and open shelf. Their distribution was controlled by paleogeographic patterns, sea level changes and the paleoclimate. Reservoir quality is considerably affected by facies together with diagenetic processes, including dolomitization and anhydrite cementation. High-quality reservoirs are found in the dolograinstone of high-energy shoal environments, which are favorable exploration facies in the carbonate ramp. Their pore space types consist of interparticle pores, intraparticle pores, intercrystalline pores, vuggy pores and moldic pores, with a porosity of 1.4%–7.5%. This study will help with our understanding of the stratigraphic framework, sedimentary-facies evolution and high-quality reservoir distribution of the Early Cambrian carbonate ramp in the Tarim Basin, facilitating exploration and the production of hydrocarbons from the Xiaoerbulake Formation.

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Section: Argillaceous Dolostone (F5)mentioning

confidence: 99%