Geological Controls and Mechanism of Shale Gas and Shale Oil Accumulations in Liaohe Western Depression, China

Jing, Tieya; Zhang, Jinchuan; Mao, Junli; Li, Wanjun; Jiang, Shengling

doi:10.1260/0144-5987.32.3.503

Cited by 14 publications

(5 citation statements)

References 10 publications

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“…Shale oil, as an unconventional resource, has received much attention recently because it is a considerable amount of potential energy . Thus, many researchers have focused their attention on the exploitation of shale oil. − …”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Diffusion of Shale Oils in Montmorillonite

Wang

et al. 2016

J. Phys. Chem. C

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Shale oil is an important unconventional resource gathered in shales with nanoscale pores. In this work molecular dynamics simulations were performed to investigate the diffusion of shale oil in the clay-rich shale. The montmorillonite model was used to represent the clay-rich shale, and octane was used as a shale oil model. Results show that the diffusion coefficient of shale oils is extremely small in the basal spacing of 2.8 nm, and with the increase of basal spacing, the diffusion coefficient increases by several orders of magnitude. This observation indicates that once the shale oils flow from microscopic pores into the mesoscopic pores, it would be accompanied by the decrease of oil density and extreme increase of diffusion coefficient, which is very beneficial for exploitation of shale oils. However, it is still difficult to exploit the oil molecules adsorbed in the microscopic pore. Besides, by exploring the effect of chain length of the oil molecule on the diffusion, we found that the shorter chain oils are beneficial for exploitation. It is expected that these simulation results provide useful reference and important fundamentality for the investigation of shale oils.

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Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Diffusion of Shale Oils in Montmorillonite

Wang

et al. 2016

J. Phys. Chem. C

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“…Pores and fractures in shales can offer storage space for shale gas accumulation and are critical for shale gas exploitation (Jing, 2014). Various fractures such as microfractures, X-shaped joints and small-scale faults are found in well YY-1 cores, and slickensides and fault gouge also develop when faulting occurs.…”

Section: Resultsmentioning

confidence: 99%

Critical geological characteristics and gas-bearing controlling factors in Longmaxi shales in southeastern Chongqing, China

Jing

Zhang

et al. 2016

Energy Exploration & Exploitation

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The southeastern Chongqing area, one of the highest potential shale gas accumulation areas in China, experienced strong tectonic movements. Due to the tectonic uplift in Himalayan period, the target shale formation is characterized by shallow burial depth and abundant fractures. The Lower Silurian Longmaxi shale was deposited under deep and shallow continental shelf environments with abundant pyrites and graptolite fossils. The lithology of the formation includes black carbonaceous shale, calcareous shale, and siliceous shale. The thickness of the shale varies greatly from 40 to 200 m from southeast to northwest with obvious zonation. Total organic carbon (TOC) content ranges from 1.0 to 4.0% and decreases upward in the formation owing to the change of sedimentary facies. The organic matter reaches dry gas zone. Porosity ranges from 0.5 to 7.9%, and the permeability is measured in the microdarcy to nanodarcy range. Abundant fragile minerals exist in the shales which benefit the hydraulic stimulation. Isothermal adsorption tests show that the sorption gas content in place of the Longmaxi shale ranges from 1.0 to 4.5 m 3 /t and the gas content in place reaches the standard of commercial exploitation. Factors impacting gasbearing characteristics were analyzed using a mathematical statistic method, which demonstrates that TOC is the most important factor, especially to the sorption gas content. Meanwhile, clay content, thermal maturity, porosity, and mineral components are also significant factors regarding shale gas-bearing characteristics.

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“…T max values ranged from 430°C to 451°C for all samples. The R o values average 0.57% and 1.01% for FHM and FHC samples, respectively, indicating that the samples are from the beginning of the peak oil window (Jing et al, 2014). The TOC values range from 56.60%-87.00% of the samples used.…”

Section: Rock-eval Pyrolysis and Total Organic Carbonmentioning

confidence: 97%

Characteristics of Hydrogen‐rich Coals in Southern China: Implications from Organic Geochemistry and Carbon Isotopic Compositions

Lin

Wang

Yang³

et al. 2022

Acta Geologica Sinica (Eng)

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The organic geochemical characteristics of hydrogen‐rich coal in southern China were investigated synthetically through organic geochemistry and carbon isotope analyses. The results showed that the hydrogen contents of the test samples were more than 5.0% and the H/C atomic ratios were between 0.76–1.06. Samples were found to be composed mostly of Type II‐III kerogen, consistent with good hydrocarbon‐generation potential. The Ro (0.54–1.10%) and Tmax (430–453°C) values imply that the hydrogen‐rich coals were in low maturity to mature stages. Stable carbon isotopic ratios (δ13Corg) of the samples used varied from –24.5‰ to –23.4‰, the barkinite content ranging from 13.9% to 83.3%, indicating a predominantly terrestrial origin with marine influence during coal formation. Some organic geochemical parameters showed corresponding changes as the hydrogen content increased from 5.0% to 7.0%, however, the source inputs changed significantly when hydrogen content was greater than 6.0%. Terrestrial higher plants gradually become predominant within the coal‐forming materials, whereas this dominant position is not apparent at lower hydrogen contents, which is attributable to the strong seawater effect during the hydrogen‐rich coal formation process.

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Geological Controls and Mechanism of Shale Gas and Shale Oil Accumulations in Liaohe Western Depression, China

Cited by 14 publications

References 10 publications

Molecular Dynamics Simulation of Diffusion of Shale Oils in Montmorillonite

Molecular Dynamics Simulation of Diffusion of Shale Oils in Montmorillonite

Critical geological characteristics and gas-bearing controlling factors in Longmaxi shales in southeastern Chongqing, China

Characteristics of Hydrogen‐rich Coals in Southern China: Implications from Organic Geochemistry and Carbon Isotopic Compositions

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