... is reformulated, based the long diagenesis progress of the sedimentary rocks, on Dvorkin et al. (1995), by applying the constant which generally have the flat shapes and greater boundary fluid pressure. P-wave velocity obtained from the compressiblities than primary intergranular pores. In rock new model...

... source receiver pair pressure component velocity inversion kernel fresnel zone saudi arabia government receiver pair surface complexity amplitude reservoir characterization traveltime kernel applied geoscience wavefield exploration geophysicist 10 p-wave velocity Impacts of near surface...

..., although slightly, to take reflectivity coefficient series with the Ricker wavelet of appropriate mini-steps towards the end of learning. The central frequency of 27 Hz. Only P-wave velocities were estimated during the seismic inversion, and the densities of the rocks were assumed constant throughout...

... geophysicist 10 slowness p-wave velocity Ultra-low frequency AVA analysis of plane-wave primary reflection seismograms Lasse Amundsen*, Equinor Summary 1991; Dahl and Ursin, 1992; Zhao et al., 1994; Ursin et al., An amplitude versus angle (AVA) method is presented for 2003; Innanen, 2014; and Li et al...

... layers and estimate their P-wave velocities. layers cause serious problems for seismic reflection imaging of deeper structures. Seismic refraction and uphole logging surveys are carried out to map the near-surface layers and generate a velocity model. Static corrections are computed from this velocity...

.... Synthetic tests on a portion of the Sigsbee2A P-wave velocity and density models show that multi-parameter CNNRFWI can invert for the P-wave velocity and density models more accurately than the corresponding starting models. machine learning deep learning rtm image neural network multi-parameter...

... acoustic velocity model expanded abstract target area artificial intelligence elastic inversion full-waveform inversion seg international exposition upstream oil & gas biondi workflow surface data model extension s-wave velocity estimation fwi process p-wave velocity machine learning...

... the mesoscale patchy saturation effects and the microscale squirt flow effects, based on the modified frame modulus of water saturated regions under pressures. Moreover, we measured the P-wave velocity and attenuation of a partially saturated sandstone with varying pressures. After calibrating the unknown...

... is constructed based on exact Zoeppritz equations by using the Bayesian theory. It not only overcomes the limitations of conventional AVO inversion method based on the approximate expression of Zoeppritz equations, but also has good stability and accuracy. We can obtain the precise P-wave velocity, S-wave...

... of uncertainties in recorded sonic signals. The process first converts measured P-wave velocity into the symmetry axis values using the Thomsen weak vertical transverse isotropic equation and then performs fluid substitution to remove the fluid effects on velocity readings. In a demo dataset, the resulting log...

... at ultrasonic and seismic frequencies. Figure 1 shows the change of ultrasonic P-wave velocity and attenuation for porosity of 0.015, 0.025 and 0.04 with effective pressure and under variable temperatures of 70 , 100 , 130 and 160 . It can be seen that the P-wave velocity decreases and attenuation increases...

... areas. Fig.1 shows the is proposed. It contains two major algorithms to discovery six logs of well (black curves), including three elastic the superior reservoir. Firstly, a random forest algorithm parameter curves (P-wave velocity , S-wave velocity , and (RFA) is performed to predict reservoir...

... seg international exposition ambient noise upstream oil & gas seismometer reservoir monitoring system p-wave velocity transfer function co 2 exploration geophysicist 10 velocity variation temporal variation source system reservoir characterization variation Continuous reservoir...

... both EM and acoustic properties are related to the porosity, saturation, and mineral composition of the rock, we develop rock physics templates to predict P-wave velocity (Vp), S-wave velocity (Vs), and permittivity from porosity and saturation. In this work, we first estimate the IF value...

... fluids will cause the frequency band of dispersion occurring in higher frequency. The characteristic frequency band of dispersion is positively correlated with porosity and permeability, and negatively correlated with fluid viscosity. In high frequency band, P-wave velocity increases with the increase...

... porosity resistivity upstream oil & gas artificial intelligence rfa predictor p-wave velocity forest algorithm prediction Baldwin , J. L. , D. N. , Otte , and C. L. , Whealtley , 1989 , Computer emulation of human mental processes: application of neural network...

... intensity and anisotropy direction. Secondly, anisotropic velocity (VVAZ) analysis is adopted to derive the corresponding anisotropy parameters, namely, anisotropy velocity difference and fast p-wave velocity direction. Then anisotropy velocity parameters are incorporated into low-frequency model after...

.... Based on theoretical modeling, we find that in the case of identical hydrate concentration, fracture-filling gas hydrate-bearing sediments (GHBS) generally exhibit higher resistivity but lower P-wave velocity than those of pore-filling GHBS. As a result, the cross plot of these two properties...

... reservoir characterization geophysics gradient direction radiation pattern full waveform inversion p-wave velocity alkhalifah virtual source vector wavefield vti media upstream oil & gas inversion seg international exposition wave equation equation decomposed equation incidence angle...

...), the parameterization can be chosen as five elastic constants (c11, c13, c33, c44 and density) or any other forms of parameterizations. In this study, the gradients of four Thomsen parameters (vertical P-wave velocity, horizontal P-wave velocity, vertical S-wave velocity and d) are calculated. Inversion comparisons...