Fractal discrete fracture network model for the analysis of radon migration in fractured media

Feng, Shaokong; Wang, Hanqing; Cui, Yu Jun; Ye, Yongjun; Liu, Yong; Li, Xiangyang; Wang, Hong; Yang, Rong

doi:10.1016/j.compgeo.2020.103810

Cited by 30 publications

(2 citation statements)

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“…Primary measures commonly used to characterize the fracture systems in soils and rocks are summarized in Table 1 ( for more details, see Refs. [49][50][51][52][53][54][55] and the references therein).…”

Section: Fractal Features Of Fracture Systemsmentioning

confidence: 98%

Fractal Features of Fracture Networks and Key Attributes of Their Models

et al. 2023

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This work is devoted to the modeling of fracture networks. The main attention is focused on the fractal features of the fracture systems in geological formations and reservoirs. Two new kinds of fracture network models are introduced. The first is based on the Bernoulli percolation of straight slots in regular lattices. The second explores the site percolation in scale-free networks embedded in the two- and three-dimensional lattices. The key attributes of the model fracture networks are sketched. Surprisingly, we found that the number of effective spatial degrees of freedom of the scale-free fracture network models is determined by the network embedding dimension and does not depend on the degree distribution. The effects of degree distribution on the other fractal features of the model fracture networks are scrutinized.

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Section: Fractal Features Of Fracture Systemsmentioning

confidence: 98%

Fractal Features of Fracture Networks and Key Attributes of Their Models

et al. 2023

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“…Research has confirmed that, in some cases, secondary fractures can link originally unconnected faults. Verified using the fracture networks observed in a natural outcrop, models able to describe the key information pertaining to complex fractures, such as the fracture center, length, and orientation distributions, have been proposed [12]. Based on the field outcrop, the fracture-aperture-sized frequency, spatial distribution, and growth processes in bed-bounded and unbounded fractures have been observed and quantitatively studied [13].…”

Section: Introductionmentioning

confidence: 99%

Distribution Patterns and Genesis of Geological Fractures/Microfaults in the Qiongdongnan Basin, North of the South China Sea

Yu,

Song,

Chao

2023

JMSE

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The Qiongdongnan Basin (QDNB), located in the north of the South China Sea, is a Cenozoic rift basin with abundant oil and gas resources. Large flake hydrates have been found in the core fractures of Quaternary formations in the deep-water depression of the QDNB. In order to understand the spatial distribution patterns of these fractures, their geneses in sedimentary basins, and their influences on gas migration and accumulation, such fractures have been observed using high-resolution 3D seismic images and visualization techniques. Four types of fractures and their combinations have been identified, namely bed-bounded fractures/microfaults, unbounded fractures, fracture bunches, and fracture clusters. Bed-bounded fractures/microfaults are mainly short and possess high density; they have developed in mass transport depositions (MTDs) or Meishan and Sanya Formations. The unbounded fractures/microfaults that occur in Miocene–Pliocene formations are mainly long and discrete, and are dominantly caused by strong tectonic movements, the concentration of stress, and sustained intense overpressure. The fracture bunches and fracture clusters that occur in Oligocene–Early Miocene formations have commonly developed with the accumulation of large numbers of fractures and may be related to the release of pressure, diapirs, and basement fault blocks (228.9 ± 1 Ma). In this study, six fluid charging or leakage models are proposed based on distinct fracture types, assuming the uniform conductivity of each fracture. In a 3D space view, a vertical decrease in the fracture scale (number or density) will more likely result in gas supply than dispersion, thus promoting the accumulation of gas in the reservoirs. Nevertheless, the fractures above the Bottom Simulating Reflect (BSR)/seismic anomaly are excessively developed, and bed-bounded fractures within a particular layer, such as MTDs, can easily cause seabed leakage. These results are useful for explaining the vertical migration of gas/fluids in areas and formations with less developed gas chimneys, faults, diapirs, and other structures, particularly in post-rifting basins.

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