Shale oil enrichment evaluation and production law in Gulong Sag, Songliao Basin, NE China

Sun, Li; Bao-wen, Cui; Zhu, Rixiang; Wang, Rui; Feng, Zihui; LI, Binhui; Zhang, Jingya; Gao, Bo; Wang, Qiqi; Zeng, Huasen; Liao, Yiyang; Jiang, Hang

doi:10.1016/s1876-3804(23)60406-9

Cited by 29 publications

(14 citation statements)

References 9 publications

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“…These “sweet spots” in Yanchang Formation are different from many other marine and lacustrine shales. Shales from the Cretaceous Qingshankou Formation in Gulong Sag, Songliao Basin, are high in clay minerals, with the main reservoir space of Gulong shale oil related to lamellation fractures, pores of clay minerals, and OM . For the Paleogene shale oil from the Jiyang Depression, Bohai Bay Basin, the laminar carbonate shales have a high mobile oil content.…”

Section: Discussionmentioning

confidence: 99%

“…Shales from the Cretaceous Qingshankou Formation in Gulong Sag, Songliao Basin, are high in clay minerals, with the main reservoir space of Gulong shale oil related to lamellation fractures, pores of clay minerals, and OM. 24 For the Paleogene shale oil from the Jiyang Depression, Bohai Bay Basin, the laminar carbonate shales have a high mobile oil content. This is due to the oil transport into the developed intercrystalline pore of carbonate minerals, resulted from the recrystallization of carbonate.…”

Section: Effect Of Minerals On Shale Oilmentioning

confidence: 99%

“…However, recent production practice from several shale oil reservoirs in North America and China has found that the producible oil is not necessarily associated with the OM richness but related to the natural microfractures and pore structure of framework minerals; i.e., the petroleum retained or stored in the pore space of framework minerals in a free state may play an unappreciated role in oil retention in shales, which is crucial for the liquid HC recovery from shale reservoirs. , Specifically, for the compounded lithology assemblage in Wolfcamp shales in the Permian Basin, both the TOC-lean carbonate and TOC-rich siliceous/calcareous mudstones are thought to contribute to the produced shale oil . For the matrix-typed shales from the Qingshankou Formation of Songliao Basin, pores in the clay minerals and lamellation fractures are the main storage space for mobile HCs . For the compounded shales from the Jiyang Depression of Bohai Bay Basin, the laminar carbonate shales interbedded with carbonate mudstones have relatively high mobile oil saturation .…”

Section: Introductionmentioning

confidence: 99%

“…23 For the matrix-typed shales from the Qingshankou Formation of Songliao Basin, pores in the clay minerals and lamellation fractures are the main storage space for mobile HCs. 24 For the compounded shales from the Jiyang Depression of Bohai Bay Basin, the laminar carbonate shales interbedded with carbonate mudstones have relatively high mobile oil saturation. 25 In other words, shale oil occurrence and its effect on "sweet spot" identification of shale systems remain controversial.…”

Section: Introductionmentioning

confidence: 99%

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Occurrence Characteristics of Mobile Hydrocarbons in Lacustrine Shales: Insights from Solvent Extraction and Petrophysical Characterization

Yang,

Nie,

Jiang

et al. 2023

Energy Fuels

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Understanding the occurrence mechanism of mobile hydrocarbons is important for "sweet spot" identification in liquid-rich shale reservoirs. This paper investigated the occurrence and distribution characteristics of mobile hydrocarbons in a set of lacustrine shales, collected from the Upper Triassic Yanchang Formation, in the Ordos Basin. A comprehensive suite of petrophysical (pore structure and pore size distribution) and geochemical (total organic carbon quantification and Rock-Eval pyrolysis) experiments were performed on shales before and after solvent extraction. The chemical components of the extracted hydrocarbons were analyzed using liquid chromatography fractionation. Scanning electron microscopy was utilized to verify the petrophysical analyses. Then, the selective occurrence characteristics of different mobile hydrocarbon compounds in multi-scaled pores of different minerals were discussed. Results show that the specific surface area, pore volume, and pore size distribution are significantly enhanced after solvent extraction. The mobile hydrocarbons in the studies shales are controlled by organic matter richness and feldspar. The free oil content, determined in programmed pyrolysis at 300 °C, increases with the increasing total organic carbon and feldspar contents. These are related to the sorption storage and volumetric storage of shale oil, respectively. An extremely high clay content is unfavorable for hydrocarbon adsorption storage as a result of the decreasing pore volume and limited pore accessibility of clay minerals. Different mobile hydrocarbon compounds prefer to store in different pore sizes. The non/low-polar hydrocarbons (aliphatic and aromatic hydrocarbons) reside in micro-and mesopores (pore diameter of <50 nm), whereas the strong polar hydrocarbons (resins and asphaltenes) prefer to reside in macropores (pore diameter of >50 nm). Direct image analyses by electron microscopy scanning show that mobile hydrocarbons remarkably exist in the dissolution-related pores and interparticle pores. Scanning electron microscopy observations support that volumetric storage of hydrocarbon in dissolution-related pores of feldspar accounts for the "sweet spot" of the investigated shales.

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Section: Discussionmentioning

confidence: 99%

Section: Effect Of Minerals On Shale Oilmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Occurrence Characteristics of Mobile Hydrocarbons in Lacustrine Shales: Insights from Solvent Extraction and Petrophysical Characterization

Yang,

Nie,

Jiang

et al. 2023

Energy Fuels

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“…China is rich in shale oil and gas resources, with recoverable shale gas reserves of about 20 × 10 12 m 3 [4] and recoverable shale oil resources of 50 × 10 8 t [5,6]. At present, good hydrocarbon displays have been obtained in the Fengcheng Formation in Mahu Sag in the Junggar Basin, Yanchang Formation in the Ordos Basin, Qingshankou Formation in the Songliao Basin, and Shahejie Formation in the Bohai Bay Basin [6][7][8][9][10]. China's shale oil is mainly accumulated in lacustrine shales of the Mesozoic-Cenozoic [11].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneity of Micro- and Nanopore Structure of Lacustrine Shales with Complex Lamina Structure

Liu,

Qiao,

Zeng

et al. 2024

Fractal Fract

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Thin sections, AIM-SEM, MICP, and nitrogen adsorption were performed on laminated and layered shales to characterize their complex pore and fracture structure. Combining the MICP model with the FHH model, this work proposes a new fractal method for lacustrine shales with complex lamina structure. The fractal characteristics presented four zones, representing the heterogeneity of fractures, macropores, mesopores, and micropores. The pores and fractures of shale have strong heterogeneity. Laminated shale has strong heterogeneity in mesopores and moderate heterogeneity in micropores. Layered shale has strong heterogeneity in fractures and moderate heterogeneity in micropores. The lamina structure and content of organic and mineral composition has a great influence on heterogeneity. The mineral laminae in laminated shale change frequently; lamellation fractures are mainly developed, and the structures are similar. Layered shales develop fractures between layers and structural fractures; the structural differences are significant. Macropores are mostly interparticle pores between quarts with similar structures. The wider lamina thickness of layered shale provides sufficient crystallization space for minerals, so the mesopores of layered shale are more homogeneous. Micropores are less developed, mainly consisting of intraparticle pores between clay minerals, which are complex but similar in structure in the two types of shale. The heterogeneity of mesopores and micropores is not conducive to hydrocarbon migration. Fractures and macropores need to be connected with meso–micropores to form a transport system. So, mesopores and micropores play decisive roles in hydrocarbon migration. Based on the above understanding, this paper points out that hydrocarbon in laminated shale with more carbonate minerals and a high thermal evolution degree has better availability.

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Study on Hydraulic Fracture Propagation of Strong Heterogeneous Shale Based on Stress‐Seepage Damage Coupling Model

Liu,

Xiao,

et al. 2024

Energy Science & Engineering

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The developed laminar structure of shale makes it possess obvious anisotropic characteristics, and these anisotropic characteristics are one of the important factors leading to the strong and weak heterogeneous properties of shale. Additionally, there is a common phenomenon where the propagation of hydraulic fracture heights is limited in the hydraulic fracturing process of strongly heterogeneous shale reservoirs. To clarify the reasons for the limited height propagation of hydraulic fractures in strongly heterogeneous shale reservoirs, numerical simulation methods were used to study the propagation patterns of hydraulic fractures in shale reservoirs under different levels of anisotropy, flow rate, viscosity, and stress differences. The results show that as the anisotropy value increases and the heterogeneity becomes stronger, it becomes more difficult for hydraulic fractures to expand along the fracture height direction, and the fracture width at the fracture opening becomes larger. For strongly heterogeneous shale reservoir, the hydraulic fracture height can be increased within a certain range by increasing the flow rate, viscosity, and stress difference. When the upper limit value is exceeded, the hydraulic fracture height of the strong heterogeneous shale reservoir gradually becomes stable, and the increasing trend is no longer obvious. The strong or weak heterogeneity caused by the inherent anisotropic characteristics of shale reservoirs affects the development and transformation effectiveness of shale reservoirs. The research in this article will provide some reference material and guidance for the efficient development of shale reservoirs.

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Shale oil enrichment evaluation and production law in Gulong Sag, Songliao Basin, NE China

Cited by 29 publications

References 9 publications

Occurrence Characteristics of Mobile Hydrocarbons in Lacustrine Shales: Insights from Solvent Extraction and Petrophysical Characterization

Occurrence Characteristics of Mobile Hydrocarbons in Lacustrine Shales: Insights from Solvent Extraction and Petrophysical Characterization

Heterogeneity of Micro- and Nanopore Structure of Lacustrine Shales with Complex Lamina Structure

Study on Hydraulic Fracture Propagation of Strong Heterogeneous Shale Based on Stress‐Seepage Damage Coupling Model

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