Fractal characteristics of tight sandstone reservoirs: A case from the Upper Triassic Yanchang Formation, Ordos Basin, China

Applications of mercury intrusion capillary pressure for pore structures: A review

“…where S w is wetting phase saturation, p cd is the displacement pressure. Hao et al (2017) calculated the fractal dimension of the sandstone rock samples of the Yanchang Formation in the Ordos Basin using Eq. (9).…”

“…Fractal geometry gave a new method for describing complex and irregular structures (Mandelbrot, 1982). The macro-heterogeneity and micro-pore structures of the pore space have been proven to have fractal characteristics (Mandelbrot, 1982;Krohn, 1988;He and Hua, 1998;Xie et al, 2010;Lai and Wang, 2015;Hao et al, 2017), so it is a preferred method to describe the pore structure characteristics of reservoirs using fractal dimension calculated from MICP curves data (Friesen and Mikula, 1987;Angulo et al, 1992;Shen and Li, 1994;Li, 2010;Yang et al, 2016;Su et al, 2018;Li et al, 2019;Guo et al, 2020).…”

Petrography and facies distribution of Middle Ordovician Ma 51 + 2 tight dolomite reservoirs in the Ordos Basin, Central China

“…The Ordos Basin in central China represents the largest oil and gas production region in China (Cui et al, 2017;Hao et al, 2017) and has therefore been the focus of many previous studies. Recent research has identified a new tight carbonate gas exploration field within the Middle Ordovician Majiagou Formation in the east of the basin, specifically within weathering crust layers in the first and second submembers of the fifth member (herein referred to as Ma 5 1 þ 2 ; Wei et al, 2017aWei et al, , 2017b.…”

Fractal characteristics of uranium‐bearing sandstone structure and their effects on acid leaching

“…5,15,16 To increase the efficiency in exploration and development of uranium oxides in the sandstone-type uranium deposits with low permeability, it is critically important to clarify the relationship between pore structure and uranium leaching efficiency as the pore throat geometry is one of the important factors affecting the properties of rocks, and processes of uranium dissolution and leaching solution transport through the low-permeability uranium-bearing sandstone during the process of ISL. Studies [19][20][21][22] have demonstrated that the surface morphology and pore structure of the uranium-bearing sandstone possesses the property of self-similarity for a certain range of scales; in other words, the fractal geometry can be used as a reasonable and powerful tool to character their irregularity and disorder, indicating the degree of heterogeneity of the pore system. 17,18 Therefore, accurately and quantitatively depicting the surface morphology and pore structure of sandstone is greatly important in understanding the mechanism of the uranium leaching and industrial application.…”

“…However, traditional Euclidean geometry is difficult to analyze the irregularity and disorder of surface morphology and pore structure. Studies [19][20][21][22] have demonstrated that the surface morphology and pore structure of the uranium-bearing sandstone possesses the property of self-similarity for a certain range of scales; in other words, the fractal geometry can be used as a reasonable and powerful tool to character their irregularity and disorder, indicating the degree of heterogeneity of the pore system. In addition, it can build a bridge between micropore structures parameters (pore throat size, pore-size distribution, and pore throat connectivity) and permeability, and quantitatively characterize the complex degree of pore structure in the low-permeability sandstone-type uranium-bearing reservoirs effectively.…”