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Fractal Fract
Volume 9
Issue 11
10.3390/fractalfract9110729
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Total Pore–Throat Size Distribution Characteristics and Oiliness Differences Analysis of Different Oil-Bearing Tight Sandstone Reservoirs—A Case Study of Chang6 Reservoir in Xiasiwan Oilfield, Ordos Basin

by
Anliang Xiong
1,
Yanan Zhou
1,*,
Zhenzhen Shen
2,
Pingtian Fan
3,
Xuefeng Liu
3,
Ruiyang Chai
1,
Longlong Xu
1,
Hao Zhao
1,
Dongwei Liu
1,
Zhenwei Chen
1 and
Jingong Zhang
1
1
Department of Geology, Northwest University, Xi’an 710069, China
2
Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi’an 710075, China
3
Yanchang Oilfield Co., Ltd., Yan’an 716000, China
*
Author to whom correspondence should be addressed.
Fractal Fract. 2025, 9(11), 729; https://doi.org/10.3390/fractalfract9110729
Submission received: 9 October 2025 / Revised: 31 October 2025 / Accepted: 4 November 2025 / Published: 11 November 2025
(This article belongs to the Special Issue Multiscale Fractal Analysis in Unconventional Reservoirs)
Versions Notes

Abstract

In the observation of tight sandstone cores, the variations in the hydrocarbon charging usually can be observed in the same geological age reservoirs, which manifest as differential oil staining on the core surface. In order to clarify the micro total pore–throat size distribution (TPSD) characteristics and oil content differences of different oil-bearing tight reservoirs, we drilled two types of oil-bearing cores in the Chang6 formation of Xiasiwan Oilfield, conducted casting thin section (CTS), scanning electron microscopy (SEM), and X-ray diffraction (XRD) to qualitatively and quantitatively analyze petrological and pore–throat characteristics. The TPSD of different oil-bearing cores were quantitatively characterized and compared by combining high-pressure mercury injection (HPMI) and constant rate mercury injection (CRMI). Meanwhile, we quantitatively evaluated the complexity of the pore–throat structure based on fractal theory. Our results reveal significant difference in the clay mineral contents between the two types of cores, despite both being classified as arkose. Due to higher contents of illite, calcite, and chlorite, the pores of oil-smelling sandstone are obviously affected by cementation. The result of TPSD characteristics shows that the oil-appearing sandstone samples exhibit well-developed big pores and throats, displaying bimodal distribution, and three-stage fractal characteristics in the TPSD curves. Conversely, oil-smelling sandstone samples manifesting a left-skewed bimodal, pore space contribution of the samples is more dependent on pores and throats smaller than 0.12 μm. The TPSD curves exhibit three-stage and four-stage fractal characteristics. Therefore, the differences in oil-bearing properties between the two types of cores are attributed to variations in mineral composition, diagenesis, clay mineral content, pore types, pore–throat size distribution (PSD), and pore–throat complexity. Our results provide crucial guidance for subsequent reservoir quality assessment in this study area and the development of tight sandstone reservoirs with similar geological characteristics.
Keywords: Ordos Basin; different oil-bearing reservoirs; total pore–throat size distribution; fractal characteristics; oiliness difference Ordos Basin; different oil-bearing reservoirs; total pore–throat size distribution; fractal characteristics; oiliness difference

Share and Cite

MDPI and ACS Style

Xiong, A.; Zhou, Y.; Shen, Z.; Fan, P.; Liu, X.; Chai, R.; Xu, L.; Zhao, H.; Liu, D.; Chen, Z.; et al. Total Pore–Throat Size Distribution Characteristics and Oiliness Differences Analysis of Different Oil-Bearing Tight Sandstone Reservoirs—A Case Study of Chang6 Reservoir in Xiasiwan Oilfield, Ordos Basin. Fractal Fract. 2025, 9, 729. https://doi.org/10.3390/fractalfract9110729

AMA Style

Xiong A, Zhou Y, Shen Z, Fan P, Liu X, Chai R, Xu L, Zhao H, Liu D, Chen Z, et al. Total Pore–Throat Size Distribution Characteristics and Oiliness Differences Analysis of Different Oil-Bearing Tight Sandstone Reservoirs—A Case Study of Chang6 Reservoir in Xiasiwan Oilfield, Ordos Basin. Fractal and Fractional. 2025; 9(11):729. https://doi.org/10.3390/fractalfract9110729

Chicago/Turabian Style

Xiong, Anliang, Yanan Zhou, Zhenzhen Shen, Pingtian Fan, Xuefeng Liu, Ruiyang Chai, Longlong Xu, Hao Zhao, Dongwei Liu, Zhenwei Chen, and et al. 2025. "Total Pore–Throat Size Distribution Characteristics and Oiliness Differences Analysis of Different Oil-Bearing Tight Sandstone Reservoirs—A Case Study of Chang6 Reservoir in Xiasiwan Oilfield, Ordos Basin" Fractal and Fractional 9, no. 11: 729. https://doi.org/10.3390/fractalfract9110729

APA Style

Xiong, A., Zhou, Y., Shen, Z., Fan, P., Liu, X., Chai, R., Xu, L., Zhao, H., Liu, D., Chen, Z., & Zhang, J. (2025). Total Pore–Throat Size Distribution Characteristics and Oiliness Differences Analysis of Different Oil-Bearing Tight Sandstone Reservoirs—A Case Study of Chang6 Reservoir in Xiasiwan Oilfield, Ordos Basin. Fractal and Fractional, 9(11), 729. https://doi.org/10.3390/fractalfract9110729

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