Closed-system pyrolysis-based hydrocarbon generation simulation and gas potential evaluation of the Shanxi Formation shales from the Ordos Basin, China

Guo, Xingwei; Shi, Baohong; Li, Yu; Li, Yanxia; Sun, Jianbo; Liu, Gang; Yin, Jiyuan; Wu, Hongzhu; Jin, Xi

doi:10.1016/j.engeos.2021.09.001

Cited by 7 publications

(6 citation statements)

References 19 publications

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“…There may be some discrepancies between the thickness and TOC of source rocks predicted from logging and geological data, which may have affected gas generation. The heterogeneity of source rocks may also be reflected in the differences in the kinetic parameters of hydrocarbon generation. ,, Therefore, the hydrocarbon generation intensity of source rocks at different locations may be different, so that the R o -hydrocarbon generation curve of a single sample leads to uncertainty in gas generation. Otherwise, the TOC content changes during the thermal evolution of the source rocks, and the measured TOC content of the source rock reflects the residual organic carbon content after hydrocarbon generation.…”

Section: Resultsmentioning

confidence: 99%

“…Organic-rich Permian marine-continental transitional shales were widely distributed in the Ordos Basin. The organic matter is dominated by humic-type kerogen, with total organic carbon (TOC) contents ranging from 1̃3% to more than 20% and vitrinite reflectance ( R o ) values ranging from 1.8∼2.5%, indicating good potential for gas generation. , Researchers have carried out detailed studies on Permian transitional shales and made many advances in the sedimentary environment, reservoir characteristics, and enrichment conditions, confirming their great resource potential. ,, As important Permian gas-bearing layers, the Shanxi Formation shales are widely distributed and have large thicknesses, high thermal maturity, and favorable geological conditions for the formation of large-scale shale gas reservoirs. − To date, research on the Shanxi Formation shales mainly focused on the shale petrology, pore structure, sedimentology, and geochemistry. − The conditions for hydrocarbon generation in the source rocks provide an important material basis for shale gas enrichment. In addition to the spatial distribution and geochemistry, the thermal maturity and gas generation of the source rocks are essential for shale gas accumulation.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of Burial History, Source Rock Maturity, and Hydrocarbon Generation of Marine-Continental Transitional Shale of the Permian Shanxi Formation, Southeastern Ordos Basin

Cheng,

Li,

Yin

et al. 2024

ACS Omega

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The Ordos Basin is characterized by abundant natural gas resources, and the marine-continental transitional shale gas of the Permian Shanxi Formation has great exploration and development potential. However, few systematic studies have focused on the burial history, thermal maturity, and hydrocarbon generation of the shale, which limits the understanding of shale gas enrichment and resource evaluation. To reveal the shale gas resource potential, we focused on the Shanxi Formation shale in the southeastern Ordos Basin. Net erosion was estimated, and then one-dimensional (1D) and three-dimensional (3D) geological models were constructed using PetroMod to simulate the burialthermal history and hydrocarbons generated in the Shanxi Formation shale, and finally, the gas generation intensity was evaluated. The results show that four periods of uplift and erosion events have occurred in the study area since the Mesozoic, of which the erosion in the Late Cretaceous was the most severe. The burial center gradually shifted from east to northwest in the study area, and the basin reached the maximum burial depth in the Late Cretaceous and then gradually changed to a monoclinal tilted east to west after uplift and erosion. The Shanxi Formation shale reached the hydrocarbon generation threshold at 233 Ma (R o = 0.5%), reached the oil generation peak at 200 Ma (R o = 1.0%), and entered the high maturity stage rapidly (R o = 1.3%). Currently, the average maturity is approximately 2.48%, which is in the overmature stage. The center of shale maturity was in the southern part of the study area before the Late Jurassic and shifted northeast in the late Early Cretaceous. Cumulative gas generated to date is 44.0 × 10 12 m 3 , and the center of gas generation was in the middle-eastern region of the study area before the Early-Middle Jurassic and shifted northwest in the Early Cretaceous. This study provides a theoretical basis and guidance for the exploration and development of marine-continental transitional shale in the Ordos Basin.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling of Burial History, Source Rock Maturity, and Hydrocarbon Generation of Marine-Continental Transitional Shale of the Permian Shanxi Formation, Southeastern Ordos Basin

Cheng,

Li,

Yin

et al. 2024

ACS Omega

Self Cite

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“…Subsequently, the field of view is moved equidistantly, and more than 300 fields of view are counted for each sample. The type of kerogen is calculated by the type index of kerogen according to the standard of SY/T 5125–1996 40 (Eq. 1 ).…”

Section: Experiments and Methodsmentioning

confidence: 99%

A model for superimposed coalbed methane, shale gas and tight sandstone reservoirs, Taiyuan Formation, Yushe-Wuxiang Block, eastern Qinshui Basin

Xie

Gan

Chen

et al. 2022

Sci Rep

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Superimposed accumulation mechanism and model of vertical source rock–reservoir system of coal-measure gas is crucial to evaluate the exploration potential, and also the basis of co-exploration and co-production of coal measure gas. This work investigates the formation mechanism of various types of reservoirs (coalbed methane, shale gas, tight sandstone) in the Taiyuan Formation (Yushe-Wuxiang Block, eastern Qinshui Basin). Source rocks (coal seams and coal-measure mudstones) in the study area are characterized by type III kerogen, organic rich and over-mature, and reach a gas generation peak during the Early to Late Cretaceous. Coalbed methane mainly adsorbs on the surface of micropores, shale gas mainly occurs in micropores, macropores and micro-factures in adsorbed and free states, and tight sandstone gas mainly occurs in macropores in a free state. The combinations of successions are identified, coalbed methane, shale gas, and tight sandstone gas horizons are divided into a mudstone-sandstone reservoir (combination I), a coal-mudstone-sandstone reservoir (combination II), and a coal-mudstone reservoir (combination III). This division occurs from top to bottom in the succession and is identified on the basis of lithology, total organic carbon content (TOC) of mudstones, gas logging, superimposition relationships, and the source rock-reservoir-caprock assemblage. The strata thickness, continuity, and gas logging results of combination III comprise the most favorable conditions for fairly good development potential, followed by combination I. The development potential of combination II is poor due to the small strata thickness and poor continuity. The identification of superimposed reservoirs can provide an engineering reference for the exploration of coal-measure gas.

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“…The basin is currently divided into six main units based on their structural morphology and characteristics. The Tertiary structure is mainly characterized by nose‐like folds, which exhibit simple structure, gradual stratum development, and dip angles generally below 1° 50–52 . The Ordos Basin hosts a variety of oil and gas formations, with the Mesozoic and the Upper Paleozoic periods being particularly notable for their petroleum strata, which are known to contain natural gas reservoirs.…”

Section: Geological Overviewmentioning

confidence: 99%

“…The Tertiary structure is mainly characterized by nose-like folds, which exhibit simple structure, gradual stratum development, and dip angles generally below 1°. [50][51][52] The Ordos Basin hosts a variety of oil and gas formations, with the Mesozoic and the Upper Paleozoic periods being particularly notable for their petroleum strata, which are known to contain natural gas reservoirs. During the Late Paleozoic period, the sedimentary environment of the basin experienced a series of evolutionary processes, including marine deposition, marine-terrestrial transitional deposition, and continental deposition.…”

Section: Geological Overviewmentioning

confidence: 99%

Pore structure of tight sandstones with differing permeability: The He 8 Member of the Middle Permian Lower Shihezi Formation, Gaoqiao area, Ordos Basin

Chen,

Zhu,

Wang

et al. 2023

Energy Science & Engineering

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Tight sandstone has strong pore heterogeneity and complex pore structure, and the pore structure of tight sandstone varies with different permeability. To study the differences in the pore structure of tight sandstone with different permeability, this study investigated the tight sandstone of the He 8 Member in the Gaoqiao area of the Ordos Basin. Factors influencing pore formation are analyzed through experiments utilizing methods, such as distinguishing casting thin sections, scanning electron microscopy, high‐pressure mercury intrusion, and low‐temperature nitrogen adsorption. The results indicate that in this area, the pores of the tight sandstone are primarily dissolution and intercrystalline pores, with occasional intergranular pores and microcracks. Type Ⅱ samples (permeability > 0.2 × 10−3 μm2) are primarily composed of dissolution and intercrystalline pores, with a few visible intergranular and microcracks. In contrast, Type Ⅰ samples (permeability < 0.2 × 10−3 μm2) mainly consist of micropores and intercrystalline pores, where microcracks are observed locally. Pore size research demonstrates that Type Ⅰ samples have pore size under 1000 nm, with peaks primarily at 4–5 nm. There are also peaks between 10–1000 nm, but without a consistent pattern. For Type Ⅱ samples with sizes smaller than 1000 nm, pore distribution is evident. Peak values when the pore size exceeds 1000 nm. Type Ⅰ samples have fewer micron‐level pores, while Type Ⅱ samples are primarily dissolution pores. The nanopores of Type Ⅰ samples consist of flat pores with good connectivity, whereas those of Type Ⅱ samples are mainly blind pores with poor connectivity. Type Ⅰ samples have larger pore fractal dimensions, more intricate pore morphology, and rougher and irregular pore throat surfaces compared to Type II samples. Hence, the sedimentary environment, diagenesis, and mineral composition affect the pore distribution in tight sandstone. The research findings highlight the variations in the pore structure of tight sandstone with varying permeability, providing crucial guidance for classifying and assessing pore structure in tight sandstone reservoirs.

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Closed-system pyrolysis-based hydrocarbon generation simulation and gas potential evaluation of the Shanxi Formation shales from the Ordos Basin, China

Cited by 7 publications

References 19 publications

Modeling of Burial History, Source Rock Maturity, and Hydrocarbon Generation of Marine-Continental Transitional Shale of the Permian Shanxi Formation, Southeastern Ordos Basin

Modeling of Burial History, Source Rock Maturity, and Hydrocarbon Generation of Marine-Continental Transitional Shale of the Permian Shanxi Formation, Southeastern Ordos Basin

A model for superimposed coalbed methane, shale gas and tight sandstone reservoirs, Taiyuan Formation, Yushe-Wuxiang Block, eastern Qinshui Basin

Pore structure of tight sandstones with differing permeability: The He 8 Member of the Middle Permian Lower Shihezi Formation, Gaoqiao area, Ordos Basin

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