Geochemical Properties and Pore Structure Control on Oil Extraction of Shale

Liu, Dengke; Su, Jun-Wei; Gu, Zhengqi; Qi, Yiru; Yang, Fangxing; Tian, Tao; Ye, Feng

doi:10.2113/2021/6646791

Cited by 6 publications

(8 citation statements)

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“…Pore networks in organic–inorganic components of organic-rich shales play an essential role in hydrocarbon storage. ,, Furthermore, the large molecular size of shale oil is not present in all of the shale matrix’s pores. , Thus, it is imperative to determine the main occurrence space of shale oil. ,,,, Previous studies have mostly concentrated on the pore structure of shale reservoirs. ,,, However, a few studies have focused on the physical state of shale oil, ,, leaving the relationship between the pore structure and fluid properties unclear. One of the crucial reasons is that the physical state of shale oil is complicated and is difficult to observe and describe directly.…”

Section: Discussionmentioning

confidence: 99%

“…15,31 Thus, it is imperative to determine the main occurrence space of shale oil. 19,28,67,73,74 Previous studies have mostly concentrated on the pore structure of shale reservoirs. 20,22,23,28 However, a few studies have focused on the physical state of shale oil, 16,18,32 leaving the relationship between the pore structure and fluid properties unclear.…”

Section: Occurrence State and Space Of Shale Oil 421 Occurrence Space...mentioning

confidence: 99%

“…CO 2 and N 2 adsorption/desorption, mercury intrusion porosimetry (MIP), and other approaches have been widely employed to assess the pore structure of unconventional shale systems. ,− Previous studies have shown that N 2 adsorption is a good technique for evaluating mesopores with 2–50 nm diameter. In contrast, CO 2 adsorption is much more reliable in characterizing micropores with lower than 2 nm. ,,, Additionally, the injection pressure of MIP is generally much higher (>200 MPa).…”

Section: Introductionmentioning

confidence: 99%

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Occurrence Space and State of Petroleum in Lacustrine Shale: Insights from Two-Step Pyrolysis and the N₂ Adsorption Experiment

Liu

Jiang

et al. 2022

Energy Fuels

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The pore structure and occurrence state of hydrocarbons in shale reservoirs are significant factors affecting shale oil production. However, how pore structure affects the occurrence of shale oil remains unclear. This paper aims at analyzing the major distribution space of shale oil with various physical states in shale pores using experimental approaches. Therefore, the original samples and solvent-extracted samples of lacustrine shale from the Permian Fengcheng Formation in Junggar Basin were investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Rock-Eval pyrolysis, and N 2 adsorption/desorption methods. The findings demonstrate that the Fengcheng shale has high oil content, with free oil accounting for 57.17% of the total oil yield. The pore size distribution characteristics of original and solvent-extracted shale samples indicate that shale oil is mainly stored in mesopore pores with diameters between 5 and 40 nm. The threshold limit of pore diameter for the movable oil in shale reservoirs is between 3.5 and 19 nm. Also, by comparing shale oil mobility in various basins, it is found that petroleum mobility occurs when the total oil yield in the shale reaches 6 mg HC/g Rock. Meanwhile, the threshold value of petroleum mobility in different basins is related to the pore shape. Parallel plate pores within shales are more favorable for petroleum mobility. This research presents the mobility of the shale oil threshold, which is critical for shale oil exploration and exploitation.

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Section: Discussionmentioning

confidence: 99%

Section: Occurrence State and Space Of Shale Oil 421 Occurrence Space...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Occurrence Space and State of Petroleum in Lacustrine Shale: Insights from Two-Step Pyrolysis and the N₂ Adsorption Experiment

Liu

Jiang

et al. 2022

Energy Fuels

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“…e statistical analysis (Figure 4(a)) show that the reservoir porosity is mainly between 7% and13% with an average of 10.5%, the [22].…”

Section: Physical Characteristics Of the Reservoirmentioning

confidence: 99%

Microscale Mineral and Pore Structure Characterization of the Low‐Permeability Sandstone in the Ordos Basin, China

Gao¹,

Sun

Liu

et al. 2021

Advances in Civil Engineering

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Given the insufficient understanding of the characteristics and controlling factors of the low-permeability sandstone reservoir in the Heshui area, the Ordos Basin, the present study examined the microscale mineral and pore structure of Chang 2 reservoir. It analyzed its major controlling factors using a series of methods, including imaging and indirect methods. The results show that the rocks of Chang 2 reservoir in the study area are dominated by lithic arkose and feldspathic detritus quartz sandstone. The reservoir space develops intragranular pores, feldspar dissolved pores, lithic dissolved pores, and intercrystallite pores. Microcracks can occasionally be found. The average porosity is 10.5%, and the average permeability is 2.2 mD, featuring a low-porosity-ultralow-permeability reservoir. During the reservoir development, traps formed by small-scale nose-shaped uplifts resulting from the tectonic effects provide opportunities for good reservoir space. Sedimentation and diagenetic processes control the degree of development and direction of the evolution of reservoir porosity to a certain degree. Multisegment capillary pressure curve and long missing zone were corresponding to relatively good pore-throat structures. Illite was the predominant diagenetic clay minerals that determine the reservoir quality. These three effects all contribute to the overall development of the reservoir.

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“…Then, the porosity would decrease obviously during the diagenetic path [20]. The thickness and distribution of the source rock of the Upper Triassic reservoir in the basin are widely developed, makes its importance even more apparent [21,22]. However, much work has been undertaken to study the coupling relationship between oil emplacement and pore network evolution.…”

Section: Introductionmentioning

confidence: 99%

Role Played by Oil Emplacement in Controlling Pore Network Evolution of Tight Sandstones

Zhao

et al. 2021

Geofluids

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Whether oil emplacement and diagenetic sequences provoke, deteriorate, or have no effect on pore network evolution, as implied by recent tests and theoretical analysis, are critical factors in forecasting hydrocarbon exploration and development potentials. Therefore, a systematic investigation on the effect of oil emplacement of tight sandstones is conducted to study the importance of this behavior on the pore evolution path. This study evaluated the role played by oil emplacement and diagenesis in the pore network evolution of Upper Triassic tight sandstones in the Ordos Basin. To help provide a comprehensive understanding, we have used a multidisciplinary method including physical properties, casting thin section, scanning electron microscope, X-ray diffraction, fluorometric, and inclusion analysis. The results demonstrate that the sandstones could be divided into four groups based on new criteria: calcareous sandstone, high soft component sandstone, low soft component sandstone with continual oil emplacement, and low soft component sandstone with intermittent oil emplacement. The physical properties of those types of sandstones were gradually reduced. Quartz cement captured hydrocarbon, carbonate captured hydrocarbon, free hydrocarbon, and adsorbed hydrocarbon were the four main kinds of hydrocarbons. The maturity of those sandstones was decreased progressively, indicating that the formation time of those hydrocarbons was favorable to maturity. Four stages of oil emplacement happened, and large-scale emplacement mainly occurred in the late Jurassic and early Craterous. The evidence demonstrated that tight sandstones’ high porosity could be attributed to positive diagenetic contributions with a complex interplay of chemical compaction, early formed clays, and large-scale oil emplacement. This work would provide new sights for a better understanding of the tight oil accumulation modes, and the findings could be applied in the hydrocarbon exploration and development field.

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Geochemical Properties and Pore Structure Control on Oil Extraction of Shale

Cited by 6 publications

References 87 publications

Occurrence Space and State of Petroleum in Lacustrine Shale: Insights from Two-Step Pyrolysis and the N₂ Adsorption Experiment

Occurrence Space and State of Petroleum in Lacustrine Shale: Insights from Two-Step Pyrolysis and the N₂ Adsorption Experiment

Microscale Mineral and Pore Structure Characterization of the Low‐Permeability Sandstone in the Ordos Basin, China

Role Played by Oil Emplacement in Controlling Pore Network Evolution of Tight Sandstones

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Geochemical Properties and Pore Structure Control on Oil Extraction of Shale

Cited by 6 publications

References 87 publications

Occurrence Space and State of Petroleum in Lacustrine Shale: Insights from Two-Step Pyrolysis and the N2 Adsorption Experiment

Occurrence Space and State of Petroleum in Lacustrine Shale: Insights from Two-Step Pyrolysis and the N2 Adsorption Experiment

Microscale Mineral and Pore Structure Characterization of the Low‐Permeability Sandstone in the Ordos Basin, China

Role Played by Oil Emplacement in Controlling Pore Network Evolution of Tight Sandstones

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Product

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Occurrence Space and State of Petroleum in Lacustrine Shale: Insights from Two-Step Pyrolysis and the N₂ Adsorption Experiment

Occurrence Space and State of Petroleum in Lacustrine Shale: Insights from Two-Step Pyrolysis and the N₂ Adsorption Experiment