Geochemical characteristics and origins of the diagenetic fluids of the Permian Changxing Formation calcites in the Southeastern Sichuan Basin: Evidence from petrography, inclusions and Sr, C and O isotopes

Liang, Hongda; Xu, Fanghao; Xu, Guoce; Yuan, Haifeng; Huang, Siqin; Wang, Liangjun; Fu, Deliang

doi:10.1016/j.marpetgeo.2019.02.015

Cited by 15 publications

(4 citation statements)

References 46 publications

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“…Trace elemental contents can supply information for different diagenetic processes and fluid sources [1,7,14,15]. Mn/Sr ratios can be used to evaluate the degree of carbonate diagenesis [50], and carbonates with little or no diagenesis have a Mn/Sr ratio of less than two [51].…”

Section: Sources and Characteristics Of The Dolomitizing Fluidsmentioning

confidence: 99%

“…The dissolution of precursor minerals was also proposed to supply magnesium-rich fluid for carbonate dolomitization [1]. Geochemical compositions of dolomites contain information on diagenetic processes and fluid sources [1,[13][14][15]. The δ 13 C values (0.5‰-3.2‰) and δ 18 O values (0.5‰-4.5‰) of most Cenozoic island dolostones indicate dolomitizing fluids derived from normal seawater or slightly modified seawater [1,7].…”

Section: Introductionmentioning

confidence: 99%

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Multistage Diagenetic Fluid Shaping Miocene Island Dolostones on One Isolated Atoll in the South China Sea: Insights from LA-ICP-MS U–Pb Dating and Geochemical Characterization

Luo,

Li,

Zhang

et al. 2024

Minerals

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Cenozoic dolomitization of reefal carbonates has been widely found on many tropical islands worldwide. However, most ages and geochemical data obtained from bulk samples prevent a clear understanding of the previous complex diagenetic processes of these island dolostones due to a lack of in situ age and fluid composition. In this study, one deep borehole penetrated Cenozoic carbonates on Meiji Island in the southern South China Sea and massive dolostones with thicknesses over 400 m were uncovered. The in situ U–Pb geochronology and elemental analysis were conducted on the lower Nanwan Formation (upper Miocene) comprising undolomitized calcite (bioclast), replacive dolomite, and dolomite cement. Strontium isotope ages and U–Pb dates show that the penecontemporaneous replacive dolomitization occurred at 11.0–8.5 Ma, close to the deposition of precursor limestone. The dolomite cement precipitated at 8.5–6.0 Ma. In situ elemental analyses indicate that the formation of replacive dolomite and dolomite cement in the Nanwan Formation was probably controlled by seawater. The higher Mg/Ca ratio and lower Mn and Sr contents in dolomite cements show that their fluid underwent more evaporation. The dolomite content is positively related to the porosity of reefal limestones in the Nanwan Formation, suggesting that primary voids play an important role in fluid transportation during following dolomitization. Coralline algae and lime mud with algal fragments are beneficial for the rapid nucleation of dolomite. This study demonstrates that in situ elemental analysis using laser ablation has great potential for identifying the source of multistage dolomitizing fluids and can help refine the existing dolomitization model of isolated atolls.

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Section: Sources and Characteristics Of The Dolomitizing Fluidsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multistage Diagenetic Fluid Shaping Miocene Island Dolostones on One Isolated Atoll in the South China Sea: Insights from LA-ICP-MS U–Pb Dating and Geochemical Characterization

Luo,

Li,

Zhang

et al. 2024

Minerals

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“…The detailed preparation and measurement of vitrinite reflectance (%Ro) can be found in Liang et al (2019). Sample were crushed into particles (2-3 mm), mounted in liquid epoxy on glass slides, and then polished.…”

Section: Total Organic Carbon Rock-eval Pyrolysis and Vitrinite Refle...mentioning

confidence: 99%

Kinetics of oil generation from brackish-lacustrine source rocks in the southern Bohai Sea, East China

Liang

Grice

et al. 2020

Organic Geochemistry

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“…China has conducted considerable research on marine shale of the Lower Cambrian Qiongzhusi and Wufeng-Longmaxi (Upper Ordovician-Lower Silurian) Formations since 2005, and commercial exploitation has been realized to date [1,2]. The first shale gas exploration and evaluation well (W201) obtained industrial gas from marine shale of the Wufeng-Longmaxi Formations (Upper Ordovician-Lower Silurian) in 2010 [3], and then industrial shale gas production was achieved in Fuling, Changning, Weiyuan, and other regions of the Sichuan Basin [4][5][6][7]. By the end of 2015, accumulative proven geologic reserves, proven recoverable reserves, and production of shale gas in China amounted to 5441.29 × 10 8 m 3 , 1360.33 × 10 8 m 3 , and 60 × 10 8 m 3 , respectively, indicating good prospects for rapid development [3].…”

Section: Introductionmentioning

confidence: 99%

Upper Paleozoic Transitional Shale Gas Enrichment Factors: A Case Study of Typical Areas in China

Wang

Guo

2020

Minerals

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Based on the shale gas research experience in North America, large-scale geological evaluations have been conducted in China to determine the enrichment characteristics of deep marine shale gas, leading to the discovery of the Fuling, Changning and Weiyuan shale gas fields. However, research on Upper Paleozoic transitional shale gas remains limited, restricting the subsequent exploration and development. Therefore, taking the Lower Permian Shanxi and Pennsylvanian Taiyuan Formations in the northeastern Ordos Basin and the Upper Permian Longtan Formation in southwestern Guizhou as examples, gas logging, gas desorption, thermal simulation, maximum vitrinite reflectance (Rmax), and X-ray diffraction (XRD) were used to study the influence of lithological associations, sedimentary facies, gas generation thresholds, and pore evolution on transitional shale gas, and then Upper Paleozoic transitional shale gas enrichment factors of the northeastern Ordos Basin and southwestern Guizhou were analysed. The results show that carbonaceous mudstone adjacent to coal seams presents a high gas content level, and is primarily developed in swamps in the delta plain environment, and swamps and lagoons in the barrier coastal environment. The gas generation threshold maturity (Rmax) of transitional shale is 1.6% and the corresponding threshold depths of the northeastern Ordos Basin and southwestern Guizhou are estimated to be 2265 m and 1050 m. Transitional shale pore evolution is jointly controlled by hydrocarbon generation, clay minerals transformation, and compaction, and may have the tendency to decrease when Rmax < 1.6% or Rmax > 3.0%, but increase when Rmax ranges between 1.6% and 3.0%, while the main influential factors of pore evolution differ in each period. Continuous distribution of transitional shale gas enrichment areas can be formed along the slope adjacent to coal seams with a moderate maturity range (1.6%–3.0%) in the northeastern Ordos Basin, and transitional shale gas can be enriched in the areas adjacent to coal seams with a moderate maturity range (1.6%–3.0%), abundant fractures, and favorable sealing faults in southwestern Guizhou.

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Geochemical characteristics and origins of the diagenetic fluids of the Permian Changxing Formation calcites in the Southeastern Sichuan Basin: Evidence from petrography, inclusions and Sr, C and O isotopes

Cited by 15 publications

References 46 publications

Multistage Diagenetic Fluid Shaping Miocene Island Dolostones on One Isolated Atoll in the South China Sea: Insights from LA-ICP-MS U–Pb Dating and Geochemical Characterization

Multistage Diagenetic Fluid Shaping Miocene Island Dolostones on One Isolated Atoll in the South China Sea: Insights from LA-ICP-MS U–Pb Dating and Geochemical Characterization

Kinetics of oil generation from brackish-lacustrine source rocks in the southern Bohai Sea, East China

Upper Paleozoic Transitional Shale Gas Enrichment Factors: A Case Study of Typical Areas in China

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