Dual‐source Metallogenic Mechanis: the Evidence from Magmatic Rocks in Eastern Guizhou

Chen, Gecheng; Zhang, Jun; Chen, Yi; Wang, Jishan; Zhou, Gaodian

doi:10.1111/1755-6724.12373_3

Cited by 2 publications

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“…Organic-rich shales were generally considered as source rocks in conventional petroleum systems. The relative research has focused on the mechanism (Tissot and Welte, 1984;Huang, 1996;Kelemen et al, 2006;Zhang et al, 2006;Zhang et al, 2011;Wang et al, 2012;Liu et al, 2015;Spigolon et al, 2015;Nie et al, 2016;Burnham, 2017), characteristics, evaluation (Chen et al, 2004;Pang et al, 2005;Han et al, 2015;Hadad et al, 2017;Wang et al, 2020), and influencing factors of petroleum generation and expulsion (Lewan and Stephanie, 2011;Eseme et al, 2012;Chen et al, 2014;Ma et al, 2016;Su et al, 2020;Stockhausen et al, 2021). With increasing attention given to shale oil exploration and development, research on the mechanism and influencing factors of oil retention in shales has gradually become another focus (Zou et al, 2019a;Shao et al, 2020;Hou et al, 2021b;Sun J. et al, 2021).…”

Section: Retention Mechanism Of Shale Oilmentioning

confidence: 99%

“…However, some geological observations indicate that shales containing type II kerogen may contain more considerable shale oil resources compared to shales with type I kerogen Hu et al, 2018). This may occur because the better the type of organic matter is, the greater the hydrocarbon expulsion amount per unit of organic carbon (Chen et al, 2014;Huang et al, 2017;Ma et al, 2018;Sun J. et al, 2021), resulting in a lower retainded oil content. Tian et al (2014) analyzed shales in the Qingshankou Formation in the northern Songliao Basin and reported that for Ro > 0.9%, the oil content per unit mass of TOC of type II kerogen is higher than that of type I kerogen, which seems to be related to the faster reduction in volume of type I kerogen per unit mass of TOC (Figure 5).…”

Section: Restriction Of Organic Matter Properties On Oil Retentionmentioning

confidence: 99%

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Oil Retention in Shales: A Review of the Mechanism, Controls and Assessment

et al. 2021

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Shale oil is a vital alternative energy source for oil and gas and has recently received an extensive attention. Characterization of the shale oil content provides an important guiding significance for resource potential evaluation, sweet spot prediction, and development of shale oil. In this paper, the mechanism, evaluation and influencing factors of oil retention in shales are reviewed. Oil is retained in shales through adsorption and swelling of kerogen, adsorption onto minerals and storage in shale pores. Quite a few methods are developed for oil content evaluation, such as three-dimensional fluorescence quantitation, two-dimensional nuclear magnetic resonance (2D NMR), solvent extraction, pyrolysis, multiple extraction-multiple pyrolysis-multiple chromatography, logging calculation, statistical regression, pyrolysis simulation experiment, and mass balance calculation. However, the limitations of these methods represent a challenge in practical applications. On this basis, the influencing factors of the oil retention are summarized from the microscale to the macroscale. The oil retention capacity is comprehensively controlled by organic matter abundance, type and maturity, mineral composition and diagenesis, oil storage space, shale thickness, and preservation conditions. Finally, oil mobility evaluation methods are introduced, mainly including the multitemperature pyrolysis, 2D NMR, and adsorption-swelling experiment, and the influencing factors of movable shale oil are briefly discussed. The aim of this paper is to deepen the understanding of shale oil evaluation and provide a basis for further research.

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Section: Retention Mechanism Of Shale Oilmentioning

confidence: 99%

Section: Restriction Of Organic Matter Properties On Oil Retentionmentioning

confidence: 99%

Oil Retention in Shales: A Review of the Mechanism, Controls and Assessment

et al. 2021

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Evolutions of Oil Generation and Expulsion of Marine-Terrestrial Transitional Shales: Implications From a Pyrolysis Experiment on Water-Saturated Shale Plunger Samples

et al. 2021

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Shale reservoirs are characterized by self-generation and self-accumulation, and the oil generation and expulsion evolution model of organic-rich shales is one of important factors that obviously influence the enrichment and accumulation of shale oil and gas resources. At present, however, relevant studies on marine-terrestrial transitional shales are inadequate. In this study, a pyrolysis experiment was performed on water-saturated marine-terrestrial transitional shale plunger samples with type Ⅱb kerogen to simulate the evolutions of oil generation and expulsion. The results indicate that marine-terrestrial transitional shales have wider maturity ranges of oil generation and expulsion than marine and lacustrine shales, and the main stages of oil expulsion are later than those of oil generation, with corresponding Ro values of 0.85%–1.15% and 0.70%–0.95%, respectively. Although the oil generation and expulsion process induced a fractionation in compositions between the expelled and retained oils, both the expelled and retained oils of marine-terrestrial transitional shales are dominated by heavy compositions (resins and asphaltenes), which significantly differs from those of marine and lacustrine shales. The kerogen of marine-terrestrial transitional shales initially depolymerized to transitional asphaltenes, which further cracked into hydrocarbons, and the weak swelling effects of the kerogen promoted oil expulsions. The oil generation and expulsion evolutions of these shales are largely determined by their organic sources of terrigenous higher organisms. This study provides a preliminary theoretical basis to reveal the enrichment mechanism of marine-terrestrial transitional shale oil and gas resources.

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Dual‐source Metallogenic Mechanis: the Evidence from Magmatic Rocks in Eastern Guizhou

Cited by 2 publications

References 0 publications

Oil Retention in Shales: A Review of the Mechanism, Controls and Assessment

Oil Retention in Shales: A Review of the Mechanism, Controls and Assessment

Evolutions of Oil Generation and Expulsion of Marine-Terrestrial Transitional Shales: Implications From a Pyrolysis Experiment on Water-Saturated Shale Plunger Samples

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