Impact of Magmatic Intrusion on Diagenesis of Shallow Marine Sandstones: An Example from Qasim Formation, Northwest Saudi Arabia

Bello, Abdulwahab Muhammad; Al‐Ramadan, Khalid; Koeshidayatullah, Ardiansyah; Amao, Abduljamiu O.; Herlambang, Adhipa; AlGhamdi, Faisal M.; Malik, Muhammad H.

doi:10.2139/ssrn.4197997

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“…Hydrodynamic conditions directly affect the grain size of tight sandstone, influencing the formation of primary pore characteristics. During the deposition period, sandstone with coarser grain size tends to have larger pores between particles, 88,89 which facilitates the formation of primary pores. This allows for easier fluid flow and dissolution in later stages.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

“…During the deposition period, sandstone with coarser grain size tends to have larger pores between particles, 88,89 which facilitates the formation of primary pores. This allows for easier fluid flow and dissolution in later stages.…”

Section: The Influence Of Sedimentary Environment On Pore Developmentmentioning

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

View full text Add to dashboard Cite

show abstract

Impact of Magmatic Intrusion on Diagenesis of Shallow Marine Sandstones: An Example from Qasim Formation, Northwest Saudi Arabia

Cited by 1 publication

References 0 publications

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