A dual porosity poroelastic model for simulation of gas flow in saturated claystone as a potential host rock for deep geological repositories

2021 ◽  
Vol 115 ◽  
pp. 104049
Author(s):  
Jianxiong Yang ◽  
Mamadou Fall
Keyword(s):  
Host Rock ◽  
Gas Flow ◽  
Dual Porosity ◽  
Potential Host ◽  
Deep Geological Repositories ◽  
Poroelastic Model

Swelling and osmotic flow in a potential host rock

2007 ◽  
Vol 32 (1-7) ◽  
pp. 408-420 ◽  
Author(s):  
S.T. Horseman ◽  
J.F. Harrington ◽  
D.J. Noy
Keyword(s):  
Host Rock ◽  
Potential Host ◽  
Osmotic Flow

Effect of volcanic bodies on hydrocarbon reservoirs in the northeastern part of the Chicontepec Foredeep, Mexico

2017 ◽  
Vol 5 (3) ◽  
pp. SK1-SK10 ◽  
Author(s):  
Supratik Sarkar ◽  
Kurt J. Marfurt
Keyword(s):  
Seismic Data ◽  
Host Rock ◽  
Effective Porosity ◽  
Dual Porosity ◽  
Target Zones ◽  
Northeastern Part ◽  
Preliminary Results ◽  
Close Proximity ◽  
Volcanic Events ◽  
Well Data

Shallow intrusive and extrusive volcanic events are common in the northeastern part of Chicontepec Foredeep where the close proximity of these volcanic bodies add to the complexity of the Paleocene-Eocene age tight and complex turbidite reservoirs. In accordance with studies in other basins, outcrop analogs of the Chicontepec reservoirs indicate the potential of enhanced natural fracturing and hence the increase of effective porosity in the host rock. We focus on exploring the validity of this observation in seismic and well data, which is rare in the literature. The preliminary results support the hypothesis of the potential increase of effective porosity including indication of dual-porosity systems in some areas, which would influence detailed studies aided by seismic data for considering Chicontepec reservoirs influenced by volcanic intrusions as additional target zones.

scholarly journals Characterizing mineralogy and redox reactivity in potential host rocks for a UK geological disposal facility

2015 ◽  
Vol 79 (6) ◽  
pp. 1353-1367 ◽  
Author(s):  
J. Quirke ◽  
C. M. B. Henderson ◽  
R. A. D. Pattrick ◽  
K. M. Rosso ◽  
A. Dent ◽  
...  
Keyword(s):  
Iron Content ◽  
Host Rock ◽  
Azo Dye ◽  
Total Iron ◽  
Geological Disposal ◽  
Potential Host ◽  
Fine Grained ◽  
Reducing Conditions ◽  
Redox Reactivity ◽  
Host Rocks

AbstractGeological disposal facilities (GDF) are intended to isolate and contain radioactive waste within multiple protective barriers, deep underground, to ensure that no harmful quantities of radioactivity reach the surface environment. The last line of defense in a multi-barrier GDF is the geosphere, where iron is present in the host rock mineralogy as either Fe(II) or Fe(III), and in groundwater as Fe(II) under reducing conditions. The mobility of risk-driving radionuclides, including uranium and technetium, in the environment is affected significantly by their valence state. Due to its low redox potential, Fe(II) can mediate reduction of these radionuclides from their oxidized, highly mobile, soluble state to their reduced, insoluble state, preventing them from reaching the biosphere. Here a study of five types of potential host rocks, two granitoids, an andesite, a mudstone and a clay-rich carbonate, is reported. The bulk rocks and their minerals were analysed for iron content, Fe(II/III) ratio, and for the speciation and fine-grained nature of alteration product minerals that might have important controls on groundwater interaction. Total iron content varies between 0.9% in clays to 5.6% in the andesite. X-ray absorption spectroscopy reveals that Fe in the granitoids and andesite is predominantly Fe(II), and in mudstones, argillaceous limestone and terrestrial sandstone is predominantly Fe(III). The redox reactivity of the potential host rocks both in the presence and absence of Fe(II)-containing 'model' groundwater was investigated using an azo dye as a probe molecule. Reduction rates as determined by reactivity with the azo dye were correlated with the ability of the rocks to uptake Fe(II) from groundwater rather than with initial Fe(II) content. Potential GDF host rocks must be characterized in terms of mineralogy, texture, grain size and bulk geochemistry to assess how they might interact with groundwater. This study highlights the importance of redox reactivity, not just total iron and Fe(II)/(III) ratio, when considering the host rock performance as a barrier material to limit transport of radionuclides from the GDF.

scholarly journals Application of Geochemical Technique in Exploration and Evaluation of Copper, Lead and Zinc Resources of Nepal

1993 ◽  
Vol 9 ◽  
Author(s):  
B. M. Jnawali ◽  
K. M. Amatya
Keyword(s):  
Base Metal ◽  
Host Rock ◽  
Mineral Exploration ◽  
Soil Sampling ◽  
Reliable Estimate ◽  
Soil Geochemistry ◽  
Potential Host ◽  
Lead And Zinc ◽  
Copper Lead

Application of Geochemical technique in mineral exploration was used in Nepal during 1975-1985 by the Mineral Exploration Development Board (MEDR). Systematic drainage reconnaissance over 40,000 km2 area resulted in the recognition of a large number of anomalies several of which are related to previously unknown mineralizations. The anomalies were categorized  into  1  to 4   assessed  on  the  basis  of  magnitude,  homogeneity,  area and potential host rock. All anomalies of category 1 and 2 that were investigated by follow-up stream sediment and soil geochemistry of varying stages were finally found to disclose the mineralized sources. In all cases, detailed grid soil sampling results in conjunction with geologic observations enabled to ascertain the location, extent and continuity of sub­ outcropping bedrock source with considerable precision, but it was not possible to make reliable estimate of grade. It has been attempted to evaluate the base metal resource based on the data available of the MEDR work as well as Department of Mines and Geology (DMG) and others. Although no economic deposits have been discovered except Ganesh Himal Zinc Lead, about 20 base metal prospects have been drilled and tonnage and grade proved and estimated. Of these, Kalitar Copper and Wapsa Copper deposits are considered to be of marginal economic grade, while the rest are inventoried a deposits of subeconomic to non-economic grade.

Tourmalinite as a potential host rock for gold in the Caledonides of Southeast Ireland

1989 ◽  
Vol 24 (2) ◽  
Author(s):  
P. McArdle ◽  
M. Fitzell ◽  
M.G. Oosterom ◽  
P.J. O'Connor ◽  
P.S. Kennan
Keyword(s):  
Host Rock ◽  
Potential Host

scholarly journals A Two-Dimensional Partitioning of Fracture–Matrix Flow in Fractured Reservoir Rock Using a Dual-Porosity Percolation Model

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2209
Author(s):  
Jinhui Liu ◽  
Yuli Zhou ◽  
Jianguo Chen
Keyword(s):  
Fractured Rocks ◽  
Gas Flow ◽  
Gas Permeability ◽  
Porous Matrix ◽  
Percolation Model ◽  
Dual Porosity ◽  
Two Dimensional ◽  
Fracture Density ◽  
Matrix Permeability ◽  
Matrix Flow

Fractures and micropores have varying contributions to the gas permeability of fractured reservoirs. The quantification of the contribution of fractures and micropores that form a dual-porosity system for gas permeability is critical when attempting to accurately evaluate gas production. However, due to insufficient knowledge of fracture–matrix flow partitioning in such dual-porosity systems, it is challenging for previous models to quantitatively characterize the fracture heterogeneity and accurately evaluate the gas flow and permeability in fractured rocks. In this study, we propose a dual-porosity percolation model to quantitatively investigate the contributions of fractures and matrix micropores towards the gas permeability of fractured rocks. Using percolation theory, we establish fracture networks with complex heterogeneity, which are characterized by various fracture densities and percolation probabilities within a porous matrix with various fracture/matrix permeability ratios. The compressible Navier–Stokes and Brinkman equations were adopted to describe the gas flow in the fractures and porous matrix, respectively. The simulation results indicate that the gas permeability of the dual-porosity system has an exponential relationship with the fracture density and matrix permeability. The contribution of fractures and matrix micropores toward gas permeability can be classified by establishing a two-dimensional partitioning of the fracture–matrix flow related to the fracture heterogeneity and fracture/matrix permeability ratio. The contribution of matrix micropores cannot be neglected if the fracture density is lower than a critical value.

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