We performed molecular dynamics simulation to elucidate the adsorption behavior of hydrogen (H2), carbon dioxide (CO2), and methane (CH4) on four sub-models type II kerogens (organic matter) varying thermal maturities over a wide range pressures (2.75 20 MPa) temperatures (323 423 K). The capacity was directly correlated with pressure but indirectly temperature, regardless kerogen or gas type. maximum 10.6 mmol/g for CO2, 7.5 CH4, 3.7 H2 in overmature at MPa 323 K. In all kerogens, followed...

Subsurface hydrogen storage for large-scale energy supply to decarbonize a variety of greenhouse gas-emitting activities is gaining momentum worldwide combat climate change. Hydrogen's extensive range flammable concentrations and low minimum ignition in air combined with its highly diffusive nature mandate implementation comprehensive risk management protocols maintain safety. In particular, the role diffusion process (self-diffusion) needs further investigation understand H2 transport...

Summary One method to access unconventional, heavy-oil resources is apply in-situ combustion (ISC) oxidize in place a small fraction of the hydrocarbon, thereby providing heat and pressure that enhances recovery. ISC also attractive because it provides opportunity upgrade oil situ by increasing API gravity decreasing, for instance, sulfur content. Despite considerable literature on dynamics, propagation front through porous media has never been visualized directly. We use X-ray computed...

Abstract Particle transport and deposition in turbidity currents is governed by the balance between turbulent suspension gravitational settling, with settling velocity becoming dominant during final rain‐out phases of decelerated on lobes. Differential particle velocities play a role sorting grains currents; there preference higher to be deposited first, yielding settling‐velocity gradient vertical longitudinal cross‐sections through turbidite beds. If sediments contain little variation...

Application of carbon capture at the gigaton-scale necessary for significant reduction in atmospheric CO2 requires a portfolio technologies applications that may span point-source to more dilute systems such as removal from atmosphere. We argue absorption separation processes there is strong coupling between solvent and process properties, which are uniquely dependent upon starting concentration CO2. revisit Whitman's film theory consider mass-transfer correlations determine most critical...

Summary Shale-matrix-associated transport phenomena exhibit multiple mechanisms including advective-, diffusive-, and adsorptive-driven modes, depending on the pore type. Diffusive processes are governed by shale organic constituents known as kerogens. Kerogens, composed of fine-scale microstructures, vary with respect to their petrophysical properties, origin maturity level. The extent which kerogens contribute overall is ability diffuse hydrocarbons contained within. diffusion coefficient...

Clays, hydrous aluminous phyllosilicates, have a significant impact on the interpretation of physical measurements and properties porous media. In particular, presence paramagnetic and/or ferromagnetic ions like iron, nickel, magnesium in clays can complicate analysis nuclear magnetic resonance (NMR) data for media characterization. This is due to internal field gradient induced by clay minerals. this study, we aim investigate content spin–spin relaxation time (T2), which strongly influenced...

A well production rate is an essential parameter in oil and gas field development. Traditional models have limitations for the estimation, e.g., numerical simulations are computation-expensive, empirical based on oversimplified assumptions. An artificial neural network (ANN) intelligence method commonly used regression problems. This work aims to apply ANN model estimate (OPR), water ratio (WOR), (GOR). Specifically, data analysis was first performed select appropriate operation parameters...

Carbon capture and storage by mineralization (CCSM) in mafic rock is a viable technology to store captured gaseous carbon dioxide (CO2) into carbonate minerals chemical reaction with rocks. Here, we investigate the interaction of CO2 four outcrop samples Saudi Arabian region for their CCSM potential. Samples interacted at 8.27 MPa 343 K batch reactor system 2 months, petrophysical geomechanical properties were analyzed before after treatment. The results indicate that initial state...

A conventional high-pressure/high-temperature experimental apparatus for combined geomechanical and flow-through testing of rocks is not X-ray compatible. Additionally, current transparent systems computed tomography (CT) cm-sized samples are limited to design temperatures below 180 °C. We describe a novel, high-temperature (>400 °C), high-pressure (>2000 psi/>13.8 MPa confining, >10 000 psi/>68.9 vertical load) triaxial core holder suitable CT scanning....

The gas adsorption capacity of kerogen is typically determined experimentally by isothermal experiments. Mathematical models, known as isotherms, are utilized to tie experimental data a theoretical framework provide continuous description the underlying phenomena. In this work, we present molecular investigation single-, binary-, and multicomponent behaviors methane (CH4), ethane (C2H6), carbon dioxide (CO2) based on representative nanostructure aid assessments predictive power models....

This paper summarizes results of a successful laboratory investigation to visualize and quantify pyrolysis-induced porosity evolution Uinta Basin organic-rich source rock using X-ray computed tomography (CT). Combining CT imaging techniques with radio-opaque gas as pore contrast fluid allowed for the description changes within rather than limiting quantification single bulk value, obtained by conventional measurement techniques. The immature thermally matured sample, Green River oil shale,...

Abstract In-situ Combustion (ISC) is widely accepted as an enhanced oil recovery method that applicable to various oil-reservoir types. Prediction of the likelihood a successful ISC project from first principles, however, still unclear. Conventionally, combustion tube tests crude-oil and rock are used infer whether one expects works at reservoir scale oxygen requirements. test results may lead field-scale simulation on coarse grid with Arrhenius reaction kinetics. If unsuccessful field...

Deep neural networks have received considerable attention in clinical imaging, particularly with respect to the reduction of radiation risk. Lowering dose by reducing photon flux inevitably results degradation scanned image quality. Thus, researchers sought exploit deep convolutional (DCNNs) map low-quality, low-dose images higher-dose, higher-quality images, thereby minimizing associated hazard. Conversely, computed tomography (CT) measurements geomaterials are not limited dose. In contrast...

Abstract This paper increases understanding of in-situ combustion (ISC) mechanisms based on experimental results for a Central European crude oil which ISC has proven to be economically successful. Ramped temperature oxidation (RTO), or so-called kinetics, studies measure the rate crude-oil oxidation. Similarly, tubes packed with mixtures sand, clay, water, and hydrocarbon our ability propagate front. Through combination isoconversional approach estimation reaction kinetics (apparent...

Rock physics diagnostics (RPD) established based upon the well data are used to deterministically predict elastic properties of rocks from measured petrophysical rock parameters. However, with recent advances in statistical methods, machine learning (ML) can help build a shortcut between raw and interest. Several studies have reported comparison methods for prediction properties, but scale dependence ML models was never investigated. This study aims at comparing results predicting such as...