Impact of laminae on gas storage capacity: A case study in Shanxi Formation, Xiasiwan Area, Ordos Basin, China

Huang, Hexin; Sun, Wei; Ji, Wenming; Chen, Lei; Jiang, Zhenxue; Bai, Yunyun; Tang, Xianglu; Du, Kun; Qu, Yiqian; Ouyang, Siqi

doi:10.1016/j.jngse.2018.09.001

Cited by 11 publications

(3 citation statements)

References 27 publications

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“…According to the mechanism of shale gas accumulation, natural gas also exists in interbedded siltstone, silty mudstone, or even sandstone . The rigid particles in the siltstone or sandstone interlayers and laminae increase the anticompaction resistance of reservoirs, which is conducive to pore preservation and provides storage space for free gas. , Previous studies have shown that the content of free gas in shale with interlayers (2.523 m 3 /t) is much higher than that in pure shale (1.599 m 3 /t) in the Shanxi Formation . During the exploitation of shale gas, the free gas in the pores is first discharged, and the pore fluid pressure decreases, which further promotes the dissolution of adsorbed gas in the shale into free gas.…”

Section: Resultsmentioning

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

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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%

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 organic matters of the Shanxi Formation shales are mainly type II 2 and III kerogen, the TOC is relatively high, and the thermal evolution is in the mature stage. 33,48,49…”

Section: Geological Settingmentioning

confidence: 99%

“…From the information of the SX-1 well, the lithology is composed of sandstone, coal, and dark shale, while the sandy content decreases from top to bottom (Figure c). The organic matters of the Shanxi Formation shales are mainly type II 2 and III kerogen, the TOC is relatively high, and the thermal evolution is in the mature stage. ,, …”

Section: Geological Settingmentioning

confidence: 99%

Controls on the Organic Matter Accumulation of the Marine–Continental Transitional Shanxi Formation Shale in the Southeastern Ordos Basin

Cheng

Zhang

et al. 2022

ACS Omega

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The marine–continental transitional shale with favorable geological conditions for shale gas accumulation and broad resource prospects is widely distributed in China, which is also well developed in the Ordos Basin. The reservoir characteristic and gas-bearing properties of the transitional Shanxi Formation shale have been studied in previous studies. However, the factors influencing the organic matter (OM) accumulation have not been well studied, which restricts shale gas exploration and development of the Shanxi Formation in the Ordos Basin. According to analyses of organic geochemistry, mineral compositions, and major and trace elements, this paper has studied the paleoenvironment characteristic and its influence on the OM accumulation of the Shanxi Formation shale. The results indicate that the OM is characterized by the high mature stage and type III kerogen while the total organic content (TOC) of Member 1 is higher than that of Member 2. From Member 1 to Member 2, the paleowater depth gradually decreases, along with a gradually relative cold and dry climate, decreasing the terrestrial influx intensity and paleoproductivity and increasing the oxygen content in the water column. For Member 1, the OM accumulation is mainly controlled by the terrestrial influx intensity and paleowater depth, and other paleoenvironment factors have an unobvious contribution to the OM accumulation. For Member 2, the OM accumulation is commonly controlled by the weak terrestrial influx, low paleoproductivity, and oxic water column, resulting in the low TOC of Member 2. This study reveals the paleoenvironment characteristic and controls on the OM accumulation of the Shanxi Formation shale, which is beneficial to the reservoir selection of the Shanxi Formation in the southeastern Ordos Basin and the understanding of the OM accumulation in other transitional shales.

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Role of bedding planes played in enhancing dissolution in sandstones

et al. 2022

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Impact of laminae on gas storage capacity: A case study in Shanxi Formation, Xiasiwan Area, Ordos Basin, China

Cited by 11 publications

References 27 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

Controls on the Organic Matter Accumulation of the Marine–Continental Transitional Shanxi Formation Shale in the Southeastern Ordos Basin

Role of bedding planes played in enhancing dissolution in sandstones

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