Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “RuSeS”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

5 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on RuSeS by Materials Project

RuSeS is Pyrite-derived structured and crystallizes in the cubic P2_13 space group. The structure is three-dimensional. Ru4+ is bonded to three equivalent Se2- and three equivalent S2- atoms to form RuSe3S3 octahedra that share corners with twelve equivalent RuSe3S3 octahedra, corners with three equivalent SeRu3S tetrahedra, and corners with three equivalent SRu3Se tetrahedra. The corner-sharing octahedral tilt angles are 64°. All Ru–Se bond lengths are 2.48 Å. All Ru–S bond lengths are 2.39 Å. Se2- is bonded to three equivalent Ru4+ and one S2- atom to form distorted SeRu3S tetrahedra that share corners with three equivalent RuSe3S3 octahedra, corners with six equivalent SeRu3S tetrahedra, and corners with nine equivalent SRu3Se tetrahedra. The corner-sharing octahedral tilt angles are 78°. The Se–S bond length is 2.38 Å. S2- is bonded to three equivalent Ru4+ and one Se2- atom to form distorted SRu3Se tetrahedra that share corners with three equivalent RuSe3S3 octahedra, corners with six equivalent SRu3Se tetrahedra, and corners with nine equivalent SeRu3S tetrahedra. The corner-sharing octahedral tilt angles are 78°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RuC3SeO3 by Materials Project

RuSe(CO)3 crystallizes in the cubic I-43m space group. The structure is zero-dimensional and consists of twenty-four formaldehyde molecules and two RuSe clusters. In each RuSe cluster, Ru4+ is bonded in a 6-coordinate geometry to three equivalent Se2- atoms. All Ru–Se bond lengths are 2.61 Å. Se2- is bonded in a 3-coordinate geometry to three equivalent Ru4+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Characterization of elastic mechanical properties of Tuscaloosa Marine Shale from well logs using the vertical transversely isotropic model

To avoid steep declines in the Tuscaloosa Marine Shale (TMS) production, wells are fracture-stimulated to release the hydrocarbons trapped in the matrix of the formation. An accurate estimation of Young’s modulus and Poisson’s ratio is essential for hydraulic fracture propagation. In addition, ignoring the highly heterogeneous and anisotropic character of TMS can lead to erroneous stress values, which subsequently affect hydraulic fracture width estimates and the overall hydraulic fracturing process. We have developed an empirical 1D geomechanical model that takes into account VTI anisotropy, and it is used to characterize the elastic mechanical properties of TMS in two wells. In the analyzed formation, the vertical Poisson’s ratio is less than the horizontal Poisson’s ratio, which suggests the necessity of an alternative to the ANNIE equations. The stiffness coefficients [Formula: see text] and [Formula: see text] were estimated using the relationships developed from the ultrasonic core data available for the two TMS. Further, correlations between the static and dynamic properties from laboratory tests were used to improve the minimum horizontal stress calculation. We compare VTI Young’s moduli, Poisson’s ratios, and minimum horizontal stress with the isotropic solution. VTI modeling improves the estimation of the elastic mechanical properties. The isotropic solution underestimates the minimum horizontal stress in the formation. Moreover, it was shown that the 20 ft shale interval below the TMS base is characterized by a low Young’s modulus (the vertical Young’s modulus is equal to 20 GPa, whereas the horizontal Young’s modulus is equal to 40 GPa) and may be a frac barrier.

Geochemistry & Geophysics↗
DOE OSTI2022

Tuscaloosa Marine Shale: Seal or Source? Petrophysical Comparative Study of Wells in SE Louisiana and SW Mississippi

The Tuscaloosa Marine Shale (TMS) is a versatile Late Cretaceous shale formation present in central and SE Louisiana and SW Mississippi, which drew attention because of the various roles played within the Tuscaloosa Group. In this paper, it is debated whether the Tuscaloosa Marine Shale can act as a source, reservoir, or seal all throughout the shale play or only in certain areas. Well log and core data from Adams County, Mississippi, are compared to data from East Feliciana Parish in Louisiana. Conclusions were drawn based on the results of well log analysis, X-ray Diffraction (XRD), porosity–permeability measurements, programmed pyrolysis, and fracture analysis. It was shown that the Tuscaloosa Marine Shale interval in SE Louisiana consists of important amounts of calcite, exhibits multiple natural fractures, has porosity values as high as 9.3%, and shows a TOC content of up to 2.8 wt%. On the other hand, samples from a well at the Cranfield field, MS, are characterized by considerably lower TOC values of around 0.88 wt%, porosities between 0.33% and 4%, and no serious fracturing. The formation demonstrates better reservoir and source potential in SE Louisiana and reliable CO2 sealing capacity in SW Mississippi. The analysis presented in this paper represents a holistic approach to the characterization of shale formations, is applicable to other plays around the world, and can be used as an integral part of CO2 sequestration or hydraulic fracturing programs.

04 OIL SHALES AND TAR SANDS↗