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Carbonate stringers are defined as a slab of carbonate bodies encased inside salt. In Oman, the intra-salt carbonate stringers are a very common target, especially in South Oman Salt Basin (SOSB). These stringers contain a large amount of hydrocarbon resources.
View Article and Find Full Text PDFResponse Patterns of Acoustic Wave Characteristics to Reservoir Petrophysical Parameters in Different Bedding Directions: A Case Study of Low- and Middle-Rank Coals in Xinjiang, China.
ACS Omega
October 2024
Xinjiang Yaxin Coalbed Methane Investment and Development (Group) Co., Ltd., Urumqi 830063, China.
Article Synopsis
- Acoustic wave technology allows for real-time, nondestructive assessment of coal reservoir properties critical for evaluating coalbed methane (CBM) production potential.
- A study of 48 coal samples from Xinjiang, China, revealed that coal's acoustic wave characteristics, including velocity and dynamic elastic modulus, vary with bedding orientation and are influenced by factors like apparent density, porosity, and fractures.
- The findings showed that perpendicular bedding coal samples have higher acoustic wave velocity and dynamic elastic modulus, while higher porosity and fractures decrease these values, leading to the development of regression equations to relate physical properties to acoustic wave behavior.
Bound Isoscalar Axial-Vector bcu[over ¯]d[over ¯] Tetraquark T_{bc} from Lattice QCD Using Two-Meson and Diquark-Antidiquark Variational Basis.
Phys Rev Lett
May 2024
Department of Theoretical Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India.
We report a lattice QCD study of the heavy-light meson-meson interactions with an explicitly exotic flavor content bcu[over ¯]d[over ¯], isospin I=0, and axial-vector J^{P}=1^{+} quantum numbers in search of possible tetraquark bound states. The calculation is performed at four values of lattice spacing, ranging from ∼0.058 to ∼0.
View Article and Find Full Text PDF3D VSP Imaging Using DAS Recording of P- and S-Waves in Vertical and Lateral Well Sections in West Texas.
Sensors (Basel)
May 2024
Department of Earth and Atmospheric Sciences, University of Houston, 4300 Martin Luther King Blvd, Houston, TX 77204, USA.
A 3D vertical seismic profiling (VSP) survey was acquired using a distributed acoustic sensing (DAS) system in the Permian Basin, West Texas. In total, 682 shot points from a pair of vibroseis units were recorded using optical fibers installed in a 9000 ft (2743 m) vertical part and 5000 ft (1524 m) horizontal reach of a well. Transmitted and reflected P, S, and converted waves were evident in the DAS data.
View Article and Find Full Text PDFEnergy partitioning among compressional and shear waves in three-dimensional attenuating elastic media.
J Acoust Soc Am
May 2024
Inria MAKUTU-Universite de Pau et des Pays de l'Adour, TotalEnergies, CNRS, Pau, France.
In strongly scattering elastic media without attenuation and dispersion, the wavefield is dominated by shear waves, and in three dimensions, the ratio of the S to P energy is given by ES/EP=2(vP/vS)3. This study investigates how this ratio is influenced by attenuation. Both the case of the ringdown mode, where the energy evolves from initial values, and the case of energy equilibrium, where the attenuation is balanced by energy injection sources, are treated.
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