We demonstrate robust soliton crystals generation with a fixed frequency pump laser through thermoelectric-cooler-based thermal-tuning approach in butterfly-packaged complementary-metal-oxide-semiconductor-compatible microresonator. Varieties of crystal states, exhibiting "palm-like" optical spectra that result from the strong interactions between dense ensembles and reflect their temporal distribution directly, are experimentally observed by sweeping one cavity resonance across blue-detuned...

A decagonal quasicrystal with point group 10/mmm has been found in Al-14-at.%-Fe alloy. Zone-axis patterns of the phase appearing at icosahedral positions are reminiscent appropriate patterns. The symmetry and angular separation zone axes can be obtained from by addition a mirror plane normal to fivefold axis. This is supported observed diffuse streaking parallel tenfold similar Al-20-at.%-Mn alloy reported Bendersky likewise explained planes intersecting axis phase.

Conventional reflectivity inversion methods are based on a stationary convolution model and theoretically require seismic traces as input (i.e., those free of attenuation dispersion effects). Reflectivity for nonstationary data, which is typical field surveys, requires us to first compensate the earth’s [Formula: see text]-filtering effects by inverse text] filtering. However, compensation filtering inherently unstable, offers no perfect solution. Thus, we presented sparse method data. We...

Abstract The standard Biot‐Gassmann theory of poroelasticity fails to explain strong compressional wave velocity dispersion experimentally observed in 12 tight siltstone with clay‐filled pores. In order analyze and understand the results, we developed a new double‐porosity model clay squirt flow where wave‐induced local fluid occurs between micropores aggregates intergranular macropores. is validated based on combined study ultrasonic experiments specimens at different saturation conditions...

Abstract We developed a system to explore the effects of pressure and fluid viscosity on dispersion attenuation fully saturated tight sandstones, especially at seismic frequencies. Calibration new revealed that can operate reliably frequencies [2–200, 10 6 ] Hz. Tight sandstone with “crack–pore” microstructure was tested under nitrogen gas (dry), brine, glycerin saturation. A frequency‐dependent effect not found for dry case. However, apparent undrained/unrelaxed transition clearly observed...

The mechanical properties and elastic anisotropy of shale oil reservoirs are influenced by factors such as lithology, pore structures, fluids. Studying the dynamic static is crucial for predicting geological engineering “sweet spots” in these reservoirs. While there has been extensive research on shale, multi-frequency remains under-explored. This study investigates anisotropic dispersion mechanism favorable lithofacies (lamellar dolomitic with vertical horizontal...

The dolomite reservoir in the fourth member (Ma4) of Ordovician Majiagou Formation is a significant gas Ordos Basin, China. It consists thin layers within limestone, characterized by mottled dolomitic limestone texture, with pores formed complex diagenetic processes that result low porosity values. These show minimal petrophysical contrast surrounding rock, complicating identification and property prediction using conventional elastic attributes like P- S-impedances. To overcome this...

The induced polarization (IP) parameters, such as the peak relaxation time and polarizability, have potential to characterize pore structures of geomaterials can be further used distinguish lithology. However, systematic experimental research on IP response carbonate rocks is scarce. To fill this gap knowledge, we investigated complex resistivity 16 rocks, including dolostone limestone, discussed applicability existing mechanisms for rocks. relationship between parameters were analyzed by...

Summary Kuman and Han algorithm has been an effective solution to simultaneously invert for the aspect ratio volume fraction of different pore types in carbonate characterization. In algorithm, a key step is usage Wyllie equation estimate velocities relying on primary porosities rocks. However, our research reveals that Wyllie's tends underestimate velocity low porosity range below 25%, overestimate over 30%. As result, Kumar underestimates overestimates stiff pores. Our further proposes...

A fully polarimetric borehole radar system using four combinations of dipole and slot antennas was developed to acquire data sets in drilled boreholes. First, implement polarimetry analysis, a processing scheme suitable for analyzing single-hole reflection set acquired by the is presented. This consists antenna-characteristic compensation, migration image reconstruction, time-frequency analysis single-frequency construction. Two target decomposition methods, namely: 1) Pauli 2)...

To circumvent the polarization sensitivity of ground penetrating radar (GPR) in detecting a linear object, we propose simple hybrid dual-polarization GPR system consisting circularly polarized spiral antenna for transmit and two orthogonally oriented Vivaldi antennas receiving polarizations. The combination with is demonstrated to operate an ultrawideband, have small dispersion, possess favorable isolation. improved performance proposed over conventional single-polarized one subsurface...

ABSTRACT Natural shale samples, particularly well‐preserved, drilled core are extremely difficult to obtain for laboratory research. Multiple tests must be carried out on one sample, and some samples disposed after destructive tests. Therefore, rarity non‐reusability of strongly restrict studies. In this study, based statistical data from the world's major block, a new type synthetic was physically constructed via process interfusion, stuffing, compaction using quartz, clay, carbonate,...

High index doped silica glass exhibiting low loss property and CMOS compatibility is a promising material in nonlinear optics. In this work, mode-locked soliton crystals (SCs) are demonstrated high-Q (>106) micro-ring resonator (MRR) made platform. The asymmetric spectra of SCs numerically investigated interpreted as the combined impact Raman self-frequency shift (RSFS) wavelength-dependent loss. By precisely comparing experimental simulated based on perturbed Lugiato-Lefever equation (LLE),...

Fluid and effective fracture identification in reservoirs is a crucial part of reservoir prediction. The frequency-dependent AVO inversion algorithms have proven to be for identifying fluid through its dispersion property. However, the conventional based on Smith & Gidlow Aki Richards approximations do not consider acquisition azimuth seismic data neglect effect anisotropic actual medium. aligned fractures subsurface medium induce anisotropy. anisotropy should considered while accounting...

The perfectly matched layer (PML) is an efficient absorbing boundary condition for mitigating undesired reflections in seismic wave modelling. However, the performance of conventional split-field PML (S-PML) severely reduced at grazing incidence. Very low frequency waves and evanescent can also cause spurious on interface. Such problems could be circumvented by using complex-frequency-shifted (CFS) stretching tensor PML. it difficult to adopt CFS S-PML. A Z-transform (MZT-PML) technique...

Differential Acoustic Resonance Spectroscopy (DARS) has been developed to investigate the acoustic properties of samples in kilohertz frequency range. This new laboratory measurement technique examines change resonant frequencies a cavity perturbed by introduction small test sample. The shift between empty and sample‐loaded is used estimate loaded paper presents DARS perturbation formula that combines theoretical derivation with numerical simulation measurements. Furthermore, semi‐empirical...

Recently, the great potential of seismic dispersion attributes in oil and gas exploration has attracted extensive attention. The frequency-dependent amplitude versus offset (FAVO) technology, with gradient as a hydrocarbon indicator, developed rapidly. Based on classical AVO theory, technology works assumption that elastic parameters are frequency-dependent, implements FAVO inversion using spectral decomposition methods, so it can take dispersive effects into account effectively overcome...

We present a fully polarimetric borehole radar in conjunction with polarimetry, Pauli decomposition, and H-alpha decomposition techniques to carry out physical characterization of subsurface fractures. Further tests are needed validate the applicability polarimetry analysis for targets. Toward this goal, we implementation two other techniques, namely: (1) Durden-Freeman (2) anisotropy parameter methods, context previous research examine consistency results using various techniques. While...

Abstract A laboratory device, Differential Acoustic Resonance Spectroscopy (DARS), has been developed to investigate the acoustic properties of rock materials below 1 KHz. The device is based on analyzing shifts resonance frequency a cavity perturbed by presence small sample. Numerical and experimental studies have previously shown that this technique can be used estimate compressibility samples. In study, we adopt nonlinear least‐squares whole‐curve‐fitting inversion approach, which for...

2-D seismic modelling has notable dynamic information discrepancies with field data because of the implicit line-source assumption, whereas 3-D suffers from a huge computational burden. The 2.5-D approach is able to overcome both aforementioned limitations. In general, earth model treated as an elastic material, but real media viscous. this study, we develop accurate and efficient frequency-domain finite-element method (FEM) for viscoelastic wave propagation. To perform approach, assume that...

We built a broad-frequency-band measurement system for rock elastic parameters based on the stress-strain method following Batzle et al., Geophysics 71, N1–N9 (2006). The gives strain amplitude anomalies at some frequencies. These put limitations range of frequency and jeopardize credibility results over broad band. To overcome these limitations, we investigated cause anomalous strains by numerical model simulations with finite element experimental apparatus. Through systematic analysis...

This integrated study provides significant insight into parameters controlling the dynamic and static elastic behaviors of shale. Acoustic geomechanical measurement from laboratory have been coupled with detailed petrographic geochemical analyses, microtexture observations on shale samples Wufeng−Longmaxi Formation southeast Sichuan Basin. The major achievement is establishment link between depositional environment subsequent development, which exerts a critical influence properties samples....