Predicting gas production in shale rock is challenging due to the complex multiscale processes ranging from nanometer micrometer-scale, components including resolved (e.g., microfractures) and unresolved nanoscale pores inorganic organic matters), microscopic transport mechanisms such as slip effect, surface diffusion, real effect. To this end, a comprehensive upscaling framework proposed paper mimic matrix microfracture systems. Here, are considered by modified nanopore model, then,...

In the process of blasting excavation, stress wave propagation and gas expansion can basically induce damage to surrounding rocks, which is detrimental rock mass integrity engineering safety. this case, evaluation control blast-induced effects are essential safety nearby buildings bedrock in field. Fangchenggang nuclear power station China, drill-and-blast method was employed for excavation. order reduce zone, associated should be carefully investigated. paper, regressively obtained from...

Subsurface structures generally exhibit strong heterogeneities at multiple spatial scales. In this study, two- and three-scale high-order models are developed to effectively predict nonlinear gas transport in heterogeneous porous media with multiscale configurations. The considered composed of the matrix inclusions mesoscopic microscopic scales, respectively. First, using formal two-scale asymptotic analysis, homogenized solutions, first-order higher-order solutions derived, second-order...

The process of liquid slip on rough-walled hydrophobic surfaces with and without entrapped gas bubbles is modeled. Here, starting the Navier–Stokes equations, a set partial differential equations (PDE) boundary conditions for general effective tensor rough surface are constructed by an asymptotic analysis. intrinsic roughness considered as characteristics surface. solution based weak variation form that fully recovers PDE Navier boundary. For bubbles, semi-analytical model eigenfunction...

Abstract Detailed crustal structure of large earthquake source regions is great significance for understanding the generation mechanism. Numerous earthquakes have occurred in NE Tibetan Plateau, including 1920 Haiyuan M 8.5 and 1927 Gulang 8 earthquakes. In this paper, we obtained a high-resolution three-dimensional velocity model around these two using an improved double-difference seismic tomography method. High-velocity anomalies encompassing seismogenic faults are observed to extend...

The three-dimensional (3D) pore structures and permeability of shale are critical for forecasting gas production capacity guiding pressure differential control in practical reservoir extraction. However, few investigations have analyzed the effects microscopic organic matter (OM) morphology 3D nanostructures on stress sensitivity, which precisely most unique controlling factors quality shales. In this study, ultra-high nanoscale-resolution imaging experiments, i.e. focused ion beam-scanning...

The multiscale transport mechanism of methane in unconventional reservoirs is dominated by slip and transition flows resulting from the ultra‐low permeability micro/nano‐scale pores, which requires consideration microscale rarefaction effects. Traditional continuum‐based computational fluid dynamics (CFD) becomes problematic when modeling micro‐gaseous flow these pore networks because its disadvantages treatment cases with a complicated boundary. As an alternative, lattice Boltzmann method...

We propose a boundary scheme for addressing multi-mechanism flow in porous medium slip and early transition regimes, which is frequently encountered shale gas reservoirs. Micro-gaseous organic-rich involves complex mechanism. A self-developed that combines the non-equilibrium extrapolation combined diffusive reflection bounce-back (half-way DBB) to embed Langmuir into single-relaxation-time lattice Boltzmann method (SRT-LBM) enables us describe this process, namely, coupling effect of...

Abstract An accurate prediction of nonlinear hydro‐mechanical (HM) coupling in subsurface structures with pronounced heterogeneity at multiple spatial scales is still an open topic and crucial for numerous engineering applications, example, hydraulic fracturing enhanced geothermal systems. In this study, novel high‐order multi‐scale asymptotic solutions are developed to accurately capture the locally oscillating characteristics gas flow solid displacement fields scales. First, formal...

Numerous investigations have suggested that seismic source parameters and properties of the surrounding medium harbor valuable information regarding alterations in stress fields at focal depth. Monitoring spatial temporal evolution these can yield insights into variations or within seismogenic zone, offering a critical avenue to overcome Earth's inaccessible nature. In recent years, modern such as moment, mechanism solution, drop, corner frequency, radiated energy, rupture radius,...

In the current study, we evaluate equivalent stiffness of peritubular reinforcement effect (PRE) porous dentine optimized by thickness (PTD). Few studies to date have evaluated or quantitated PRE on composite dentine. The miscrostructure is captured scanning electron microscope images, and then finite element modeling used quantitate deformation structure. By optimizing radius PTD tubule (DT), proposed FE model able demonstrate stiffness. It concluded that dentinal reduced degraded with...

The Dari fault is one of several large NW-trending left-lateral strike-slip faults with Holocene activity inside the Bayan Har Block in east Tibetan Plateau. Through interpretation high-resolution images, field investigations, and trench excavations, we estimated that average horizontal slip rate has been 2.6 ± 0.6 mm/y since late Quaternary. We also identified three earthquake events dated to 15,609–12,658 cal BP, 6741–5074 1947 AD. (such as Awancang fault, Madoi–Gardê...

Abstract Process of through-air-drying is becoming increasingly popular in the manufacture textiles, non-wovens, tissue, and towel. Very high drying rates, enhanced product properties, i.e., softness, bulk, absorbency, unique 3D structure are driving forces behind its increasing popularity. In this article, experimental results on convective heat mass transfer fluid flow characteristics tissue towel products using commercially realistic structures presented. Comparison with literature data...

Reported data of measured slip lengths in nanostructures span several orders magnitude, from a few nanometers to tens micrometers. Small roughness on surfaces caused by structural defects or thermal fluctuations dramatically reduces slippage. Tiny bubbles entrapped rough can also affect We used an asymptotic solution and high density-ratio pseudopotential lattice Boltzmann model systematically study the drag resistance surface with attached bubbles. As nucleate grow, is slightly reduced...

The Wudaoliang–Changshagongma fault is one of the NW-trending faults located within southern Bayan Har Block Tibetan Plateau in China. In this paper, we used high-resolution imagery and digital elevation model data to study geomorphological geological characteristics fault. Furthermore, result also determined trace estimated average horizontal slip rate since late Quaternary have been 2.6 ± 0.6 mm/a. This approximately equivalent that Awancang, Madoi–Garde, Dari faults, which are block....

Through-air drying is commonly used in the of high-quality tissue and towel products. A representative elementary volume method was to model fluid flow heat mass transfer during through heterogeneous porous biobased materials such as Results both upstream downstream a modeled sheet allowed visualization effects mixing at top bottom medium. The effect initial nonuniformity on convective media studied. material nonhomogeneity associated transport properties moisture content function time...

The Sichuan–Yunnan block is located in the eastern of Tibetan Plateau and exhibits strong tectonic earthquake activity. Maisu fault an E–W-trending within this block. Via interpretations remote-sensing imagery field surveys, we identified a surface rupture zone that has developed along fault; then estimated its Holocene extends westward from town Puma, Sichuan Province, to village Worilong, Xizang length approximately 45 km. According outcrop carbon-14 dating profile near Yongqu, most recent...