PreprintArticleVersion 1This version is not peer-reviewed
Classification and Controlling Factors of Different Types of Pore Throat in Tight Sandstone Reservoirs Based on Fractal Features-a Case Study of Xujiahe Formation in Western Sichuan Depression
Version 1
: Received: 6 November 2024 / Approved: 6 November 2024 / Online: 6 November 2024 (10:59:46 CET)
How to cite:
Guan, X.; Xiao, D.; Jin, H.; Cui, J.; Wang, M.; Shao, H.; Zheng, L.; Wang, R. Classification and Controlling Factors of Different Types of Pore Throat in Tight Sandstone Reservoirs Based on Fractal Features-a Case Study of Xujiahe Formation in Western Sichuan Depression. Preprints2024, 2024110411. https://doi.org/10.20944/preprints202411.0411.v1
Guan, X.; Xiao, D.; Jin, H.; Cui, J.; Wang, M.; Shao, H.; Zheng, L.; Wang, R. Classification and Controlling Factors of Different Types of Pore Throat in Tight Sandstone Reservoirs Based on Fractal Features-a Case Study of Xujiahe Formation in Western Sichuan Depression. Preprints 2024, 2024110411. https://doi.org/10.20944/preprints202411.0411.v1
Guan, X.; Xiao, D.; Jin, H.; Cui, J.; Wang, M.; Shao, H.; Zheng, L.; Wang, R. Classification and Controlling Factors of Different Types of Pore Throat in Tight Sandstone Reservoirs Based on Fractal Features-a Case Study of Xujiahe Formation in Western Sichuan Depression. Preprints2024, 2024110411. https://doi.org/10.20944/preprints202411.0411.v1
APA Style
Guan, X., Xiao, D., Jin, H., Cui, J., Wang, M., Shao, H., Zheng, L., & Wang, R. (2024). Classification and Controlling Factors of Different Types of Pore Throat in Tight Sandstone Reservoirs Based on Fractal Features-a Case Study of Xujiahe Formation in Western Sichuan Depression. Preprints. https://doi.org/10.20944/preprints202411.0411.v1
Chicago/Turabian Style
Guan, X., Lehua Zheng and Rui Wang. 2024 "Classification and Controlling Factors of Different Types of Pore Throat in Tight Sandstone Reservoirs Based on Fractal Features-a Case Study of Xujiahe Formation in Western Sichuan Depression" Preprints. https://doi.org/10.20944/preprints202411.0411.v1
Abstract
The effects of high debris content on tight sandstone reservoirs are multifaceted. Pore structure is an important factor controlling reservoir quality. Clarifying the effects of different types of rock debris on reservoirs is necessary to study the pore structure and their control factors of tight sandstones. The Western Sichuan Depression with complex rock components, containing multiple types of rock debris, leads to strong heterogeneity of pore throats, so it is necessary to study the factors controlling the development of different types of pore throats in tight reservoirs. In this paper, the Fourth member of Xujiahe Foramtion(T3x4) is taken as the research object. Based on high-pressure mercury intrusion experiments and the fractal theory, the types of pore throats and their heterogeneity in tight reservoirs were studied, the relationship of fractal dimensions with reservoir physical properties, pore structure, and rock compositions were investigated, and then the controlling factors for the development of different types of pore throats are clarified. The studies show that there are four types of pore throats developed in the T3x4 of the western Sichuan depression, including primary intergranular pore-throats, residual intergranular pore-throats, dissolution pore-throats, and intercrystalline pore-throats, among which the homogeneity of dissolution pore-throats are the best, followed by residual intergranular pore-throats and intercrystalline pore-throats, and the primary intergranular pore-throats the most heterogeneous. Brittle minerals such as quartz and metamorphic debris, as well as early developed films of chlorite and illite mainly control the development of intergranular pore-throats. Potassium feldspar mainly controls the development of dissolution pore-throats, while plastic debris, volcanic debris, and kaolinite play a destructive role for all types of pore-throats. The high-quality reservoirs in the T3x4 are controlled by the development of primary intergranular pore throats and dissolution pore throats, and they are mainly developed in environments with strong hydrodynamic conditions, large rock grain sizes, high content of brittle minerals such as quartz and metamorphic debris, extensive development of chlorite and illite films, and low content of mudstone debris, matrix, and cemented materials. This study is of guiding significance in clarifying the causes of heterogeneity in different types of pore-throat systems in tight sandstones and the formation mechanism of high-quality reservoirs in tight sandstones with high content of debris.
Environmental and Earth Sciences, Geochemistry and Petrology
Copyright:
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