Physical properties of lacustrine shale oil: A case study on the lower member of the Lucaogou Formation (Jimusaer Sag, Junggar Basin, NW China)

Liu, Shiju; Misch, David; Gao, Gang; Jin, Jun; Gang, Wenzhe; Yanjuan, Duan; Wu, Xin; Xiang, Baoli; Wang, Ming; Luo, Qingyong

doi:10.1016/j.marpetgeo.2022.105888

Cited by 5 publications

(5 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The petroleum potential of shale with type C pyrite was poor and the lowest among all of the shales. The organic matter maturity was characterized based on the PI versus T max value plot (Figure B), as given by Peters and Cassa (1994), , which shows that the Chang 7 Member shale samples were within the oil window zone.…”

Section: Resultsmentioning

confidence: 99%

“…During the syn-depositional period, pyrite was precipitated from sulfur-containing anoxic water bodies and rapidly settled on the surface of sediments due to gravity . As a result, pyrite growth was affected by the growth time and available space, and the particle size was mostly limited to less than 5 μm. , The early diagenetic stage pyrites mainly crystallized in the sediment pores below the redox interface. The particle size was mainly between 5 and 10 μm, with some exceeding 10 μm .…”

Section: Resultsmentioning

confidence: 99%

“… 55 As a result, pyrite growth was affected by the growth time and available space, and the particle size was mostly limited to less than 5 μm. 49 , 57 The early diagenetic stage pyrites mainly crystallized in the sediment pores below the redox interface. The particle size was mainly between 5 and 10 μm, with some exceeding 10 μm.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Pyrite Characteristics in Lacustrine Shale and Implications for Organic Matter Enrichment and Shale Oil: A Case Study from the Triassic Yanchang Formation in the Ordos Basin, NW China

Zhou,

Liu,

et al. 2024

ACS Omega

View full text Add to dashboard Cite

Pyrite is widely distributed in lacustrine shales and has become a research focus in unconventional oil and gas exploration. Pyrite morphology is useful for identifying different types of organic matter and assessing shale oil enrichment in organic-rich shale. Abundant pyrite is developed in the source rocks from the Chang 7 Member of the Yanchang Formation in the Ordos Basin, NW China. However, the relationship between different pyrite types and the differential enrichment of shale oil still needs to be clarified. The organic geochemistry, petrology, and isotopic composition of the Chang 7 Member samples were analyzed. The significance of pyrite types and sulfur isotopic compositions as indicators of depositional environments and shale oil enrichment was emphasized. The Chang 7 shales contain three pyrite morphologies, framboidal pyrite (type A), spherulitic pyrite (type B), and euhedral and anhedral pyrite (type C), and their aggregates. The sulfur isotopic compositions of pyrite (δ 34 S py ) in Chang 7 shales with different pyrite types exhibited regular patterns. The δ 34 S values of types A, B, and C pyrites were sequentially positive overall (average values are −2.739, 2.201, and 7.487‰ in sequence), indicating that type A pyrite was formed during the syn-sedimentary to early diagenetic stage and types B and C pyrites were formed during the early to middle diagenetic stage. Types A, B, and C pyrites showed sequentially increasing kerogen type index values and kerogen carbon isotope values (mean values of −31.59, −28.70, and −26.45‰, successively), indicating that the horizons where types A, B, and C pyrites developed correspond to types I, II, and III organic matter, respectively. Strong correlations between the pyrite content and oil components reveal that pyrite indicates shale oil enrichment. Moreover, variations in pyrite type significantly influenced the enrichment behavior of shale oil. Types A and B pyrites contributing to reservoir space showed shale oil enrichment. They promoted saturated hydrocarbon enrichment at >15% pyrite content, whereas type C pyrite did not indicate shale oil enrichment. These findings provide new insights into the differential enrichment of organic matter and shale oil and valuable guidance for the large-scale exploration and development of shale oil resources.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Pyrite Characteristics in Lacustrine Shale and Implications for Organic Matter Enrichment and Shale Oil: A Case Study from the Triassic Yanchang Formation in the Ordos Basin, NW China

Zhou,

Liu,

et al. 2024

ACS Omega

View full text Add to dashboard Cite

show abstract

“…To summarize, the research on shale reservoirs with poor physical properties, high organic matter and viscosity, and high wax content is still inadequate. Most of the studies are mainly focused on the development effect and micromechanism of different gases by shale gas injection or the effect of temperature on the physical or mechanical properties of shale. − Research on the development of heating-assisted CO 2 HNP is relatively rare, it is unclear how the displacement mechanism of heating-assisted gas HNP works, and the current research lacks guidance for CO 2 sequestration.…”

Section: Introductionmentioning

confidence: 99%

Heating-Assisted CO₂ Huff-n-Puff for Improved CO₂ Utilization: Further Discussion of the EOR Mechanism and Enhancing Carbon Sequestration in Shale Reservoirs

Zhao,

Yao,

Cheng

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

To deal with the difficult development caused by the organically rich and ultratight shale reservoirs and the environmental problems caused by the excessive discharge of CO 2 , a storage-driven enhanced oil recovery (EOR) development method of heating-assisted CO 2 huff-n-puff (HNP) is proposed in this paper. Through static reaction, diffusion, and HNP experiments, the effects of heating assistance on reservoir/fluid properties and CO 2 diffusion behavior were studied. With the help of NMR, the migration law and utilization effect of crude oil in various pore throats were further clarified, the morphological changes of the displacement front were directly characterized by numerical simulation, and the EOR mechanism was revealed. Moreover, its feasibility in carbon sequestration was explored. The research showed that heating-assisted CO 2 injection will aggravate the corrosion of primary pores on the shale surface, make the rock surface more prone to wetting inversion, and effectively reduce the viscosity of crude oil; the CO 2 diffusion coefficient in the core is more than doubled after heating, effectively improving the pore throat properties and increasing the fluidity of crude oil. After heating, the utilization ratio of macropores increased from 37.56 to 44.86%, and the remaining oil in micropores and smallpores was displaced to mesopores for redistribution. Increasing the temperature makes the displacement front of the HNP gradually evolve from being arcshaped to an overlying inclined plane, and the dimensionless displacement distance increases from 0.4 to 0.9. In addition, CO 2 can indirectly separate the heavy components in crude oil and improve the displacement mobility ratio, but the overlapping effect of gas after heating will be more obvious, which will indirectly affect the CO 2 HNP efficiency. The proportion of CO 2 stored in the reservoir increased by 4.49%, indicating the potential of the heating-assisted CO 2 HNP in carbon sequestration. This study provides valuable experimental and theoretical support for improving the utilization of CO 2 in shale reservoirs.

show abstract

“…The type of hydrocarbon phase in the reservoir not only affects resource evaluation, field development, and facilities design but also has different economic benefits. ,, In addition, there are differences in the physical properties (e.g., density, viscosity, interfacial tension) of hydrocarbons with different phase states, resulting in significant differences in the dynamics of hydrocarbon charging, migration, and accumulation. − It is of great importance for understanding the current compositional distributions in the reservoir, the mechanism of the migration and accumulation of hydrocarbons in ultradeep reservoirs, and explaining the distribution of hydrocarbons in different phase states in a basin. − …”

Section: Introductionmentioning

confidence: 99%

Hydrocarbon Phase State Evolution and Accumulation Process of Ultradeep Permian Reservoirs in Shawan Sag, Junggar Basin, NW China

Xu,

Lei,

Zhang

et al. 2023

Energy Fuels

View full text Add to dashboard Cite

A large amount of oil and gas has been discovered in the ultradeep reservoirs in the Shawan Sag, Junggar Basin. However, the hydrocarbon phases in ultradeep reservoirs are complex, and the controlling factors and evolution have not been studied, which are important for exploration and development. This study determined the hydrocarbon phase states of the reservoirs in the Upper Wuerhe Formation (P3w) of Well Zheng 10 in the Shawan Sag via hydrocarbon components and a pressure–volume–temperature (PVT) phase diagram. We used 1D basin modeling to simulate the thermal maturity of the Lower Wuerhe (P2w) source rock, components of generated hydrocarbons, reservoir temperature and pressure, and hydrocarbon phase. The results show that the hydrocarbons in the P3w reservoir are secondary condensate gas. The source rock began to enter the threshold of hydrocarbon generation at the end of the Late Triassic, and the thermal maturity (Easy Ro%) of the P2w source rock in the P3w reservoir fetch area is approximately 1.5% at present. The reservoir experienced multiple periods of hydrocarbon charging and phase evolution. During the Late Triassic to the early Late Jurassic and the late Early Cretaceous to the Late Cretaceous, the hydrocarbons in the P3w reservoir were liquid. Since the Miocene, a large amount of gas has migrated to the P3w reservoir, leading to gas invasion, which is the key to the formation of a condensate gas reservoir. The hydrocarbons changed from liquid to condensate gas due to the increasing gas–oil ratio and reservoir temperature. This study provides a quantitative method to reconstruct the phase evolution process and establishes an accumulation model of condensate gas reservoirs.

show abstract

Physical properties of lacustrine shale oil: A case study on the lower member of the Lucaogou Formation (Jimusaer Sag, Junggar Basin, NW China)

Cited by 5 publications

References 49 publications

Pyrite Characteristics in Lacustrine Shale and Implications for Organic Matter Enrichment and Shale Oil: A Case Study from the Triassic Yanchang Formation in the Ordos Basin, NW China

Pyrite Characteristics in Lacustrine Shale and Implications for Organic Matter Enrichment and Shale Oil: A Case Study from the Triassic Yanchang Formation in the Ordos Basin, NW China

Heating-Assisted CO₂ Huff-n-Puff for Improved CO₂ Utilization: Further Discussion of the EOR Mechanism and Enhancing Carbon Sequestration in Shale Reservoirs

Hydrocarbon Phase State Evolution and Accumulation Process of Ultradeep Permian Reservoirs in Shawan Sag, Junggar Basin, NW China

Contact Info

Product

Resources

About

Physical properties of lacustrine shale oil: A case study on the lower member of the Lucaogou Formation (Jimusaer Sag, Junggar Basin, NW China)

Cited by 5 publications

References 49 publications

Pyrite Characteristics in Lacustrine Shale and Implications for Organic Matter Enrichment and Shale Oil: A Case Study from the Triassic Yanchang Formation in the Ordos Basin, NW China

Pyrite Characteristics in Lacustrine Shale and Implications for Organic Matter Enrichment and Shale Oil: A Case Study from the Triassic Yanchang Formation in the Ordos Basin, NW China

Heating-Assisted CO2 Huff-n-Puff for Improved CO2 Utilization: Further Discussion of the EOR Mechanism and Enhancing Carbon Sequestration in Shale Reservoirs

Hydrocarbon Phase State Evolution and Accumulation Process of Ultradeep Permian Reservoirs in Shawan Sag, Junggar Basin, NW China

Contact Info

Product

Resources

About

Heating-Assisted CO₂ Huff-n-Puff for Improved CO₂ Utilization: Further Discussion of the EOR Mechanism and Enhancing Carbon Sequestration in Shale Reservoirs