scholarly journals Pore size distribution, their geometry and connectivity in deeply buried Paleogene Es1 sandstone reservoir, Nanpu Sag, East China

2019 ◽  
Vol 16 (5) ◽  
pp. 981-1000 ◽  
Author(s):  
Muhammad Kashif ◽  
Yingchang Cao ◽  
Guanghui Yuan ◽  
Muhammad Asif ◽  
Kamran Javed ◽  
...  
Keyword(s):  
Pore Size ◽  
Size Distribution ◽  
Coarse Grained ◽  
High Porosity ◽  
Pore Characteristics ◽  
Injection Test ◽  
Fine Grained ◽  
Mercury Injection ◽  
Shahejie Formation ◽  
Sandstone Reservoir

Abstract The study of pore characteristics is of great importance in reservoir evaluation, especially in deeply buried sandstone. It controls the storage mechanism and reservoir fluid properties of the permeable horizons. The first member of Eocene Shahejie Formation (Es1) sandstone is classified as feldspathic litharenite and lithic arkose. The present research investigates the pore characteristics and reservoir features of the deeply buried sandstone reservoir of Es1 member of Shahejie Formation. The techniques including thin-section petrography, mercury injection capillary pressure (MICP), scanning electron microscopy and laser scanning confocal microscope images were used to demarcate the pores including primary intergranular pores and secondary intergranular, intragranular, dissolution and fracture pores. Mercury injection test and routine core analysis were led to demarcate the pore network characteristics of the studied reservoir. Pore size and pore throat size distribution are acquired from mercury injection test. Porosity values range from 0.5% to 30%, and permeability ranges 0.006–7000 mD. Pore radii of coarse-grained sandstone and fine-grained sandstone range from 0.2 to > 4 µm and 1 nm to 1.60 µm, respectively, by MICP analysis. The mineral composition also plays an important role in protecting the pores with pressure from failure. Fractured sandstone and coarse-grained sandstone consist of large and interconnected pores that enhance the reservoir porosity and permeability, whereas fine-grained sandstone and siltstone consist of numerous pores but not well interconnected, and so they consist of high porosity with low permeability.

High Porosity SiC Ceramics with a Narrow Pore Size Distribution

2008 ◽  
Vol 368-372 ◽  
pp. 840-842 ◽  
Author(s):  
Li Min Shi ◽  
Hong Sheng Zhao ◽  
Ying Hui Yan ◽  
Chun He Tang
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Phenolic Resin ◽  
High Porosity ◽  
X Ray Diffraction ◽  
Narrow Pore Size Distribution ◽  
X Ray ◽  
Sic Ceramics ◽  
Porous Sic

Using the coat mix process, porous SiC ceramics are fabricated using commercially available silicon powders and phenolic resin as the starting materials. The phase composition, morphology, pore size and pore size distribution of the obtained products are characterized by X-ray diffraction, scanning electron microscopy and mercury intrusion porosimeter. The results show that high porosity SiC ceramics with a narrow pore size distribution can be fabricated at 1500°C in vacuum by the coat mix process. The open pore porosity can reach up to 60%. The pore size varies in the range of 1-6 'm.

Characterizing Porosity in Nanoporous Thin Films Using Positronium Annihilation Lifetime Spectroscopy

2002 ◽  
Vol 726 ◽  
Author(s):  
J.N. Sun ◽  
D. W. Gidley ◽  
Y.F. Hu ◽  
W.E. Frieze ◽  
S. Yang
Keyword(s):  
Pore Size ◽  
Size Distribution ◽  
Depth Profiling ◽  
Positron Beam ◽  
Bound State ◽  
Hybrid Films ◽  
Porous Films ◽  
Pore Characteristics ◽  
Positronium Annihilation ◽  
Positronium Annihilation Lifetime Spectroscopy

AbstractDepth profiled positronium annihilation lifetime spectroscopy (PALS) has been used to probe the pore characteristics (size, distribution, and interconnectivity) in thin, porous films, including silica, organic and hybrid films. PALS has good sensitivity to and resolution of all pores (both interconnected and closed) in the size range from 0.3 nm to 30 nm, even in films buried under a diffusion barrier. In this technique a focussed beam of several keV positrons forms positronium (Ps, the electron-positron bound state) with a depth distribution that depends on the selected positron beam energy. Ps inherently localizes in the pores where its natural (vacuum) annihilation lifetime of 142 ns is reduced by collisions with the pore surfaces. The collisionally reduced Ps lifetime is correlated with pore size and is the key feature in transforming a Ps lifetime distribution into a pore size distribution. In hybrid films made porous by a degradable porogen PALS readily detects a percolation threshold with increasing porosity that represents the transition from closed pores to interconnected pores. PALS is a non-destructive, depth profiling technique with the only requirement that positrons can be implanted into the porous film where Ps can form.

Preparation of Mesoporous Alumina Using Hexamethyl Disilylamine as Substitute Solvent

2013 ◽  
Vol 773 ◽  
pp. 482-486 ◽  
Author(s):  
Su Min Cui ◽  
Li Li Ren ◽  
Feng Chao Cao
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Surface Area ◽  
Supercritical Drying ◽  
Mesoporous Alumina ◽  
Bet Surface Area ◽  
High Porosity ◽  
Drying Method

Mesoporous inorganic alumina with framework walls has been synthesized using a new and simple non-supercritical drying method. As a substitute solvent, hexamethyl disilylamine (HMDS) plays a definitive part for synthesis of the mesoporous alumina due to its special characters. The resulting alumina product shows high BET surface area, concentrated distribution of diameter and high porosity. The pore size distribution of alumina we prepared is concentrated around 11nm. Its structure still maintained stable and the BET surface area could reach up to 413.4593m2/g after being calcined at 800°C.

scholarly journals Innovative Material Can Mimic Coral and Boulder Reefs Properties

2021 ◽  
Vol 8 ◽  
Author(s):  
Lucia Margheritini ◽  
Per Møldrup ◽  
Rasmus Lund Jensen ◽  
Kirstine Meyer Frandsen ◽  
Yovko Ivanov Antonov ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Low Voltage ◽  
Artificial Reef ◽  
Total Porosity ◽  
Electrical Current ◽  
High Porosity ◽  
Mineral Deposition

Low-Voltage Mineral Deposition technology (LVMD), widely known as Biorock, has previously been suggested as support for coral reef restoration, as hypothesized high porosity, wide pore-size distribution and connectivity, and good strength properties may facilitate biological functions (for example larvae settlement) and durability. In this technology, very low voltage induces an electrical current that initiates precipitation and accretion of hard minerals (aragonite and calcite) on a metal in seawater. This technology has been discussed mainly for its biological value, while this paper wants to highlight also its engineering value as artificial reef material. Indeed, some of the properties that makes it valuable in one domain are also supporting its use in the other. Because the metal on which the precipitation takes place can be of any shape and size, so can the artificial reef and its mechanical strength characteristics are above the ones of corals and similar to concrete, indicating adequate durability. Coral and boulder reefs suffering from degradation have severe implications on biodiversity, protection from flooding, and cultural value and therefore understanding how to persevere and re-establish these ecosystems is central for sustainable intervention in the marine environment. By comparing chemical-physical characteristics of Coral Porites Exoskeleton (CPE), one typical reef building coral type, LVMD and High-Voltage Mineral Deposition (HVMD), we show that they possess highly similar properties including chemical composition, density, total porosity, pore-size distribution, physical and chemical heterogeneity, total and external surface areas, and comparable mechanical strength.

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