Compressional and shear wave velocities (Vp Vs, respectively) are important elastic parameters to predict reservoir parameters, such as lithology hydrocarbons. Due acquisition technologies economy, the velocity is generally lacking. Over last few years, some researchers proposed deep learning algorithms using conventional logging data. However, these focus either on spatial feature extraction for different physical properties of rocks or sequential in depth direction rocks. Only focusing a...

It has been found that the Xu–White method for shear-wave velocity estimation of clay-sand model cannot yield accurate enough results calciferous sandy shale formation. This work proposes a revised account effect volume limestone in clastic rock formation on estimation. Based detailed analysis volume, porosity, water saturation and pore aspect ratio estimation, an inversion scheme by means components is applied to obtain better physical parameters, thereafter estimating Thus, procedure...

Building a 3D porosity model for the carbonate reservoir is crucial planning of hydrocarbon development. However, properly estimating using wireline logs still challenge task due to complexity vugs. We treat estimate as an optimization problem and propose by integrating several kinds petrophysics data. begin with establishing series linear equations between logs. The objective computing value that simultaneously minimizes defined equations. multi-functions minimization can successfully...

Abstract Compression-wave velocity and shear-wave are important elastic parameters describing deeply tight sandstone. Limited by cost technical reasons, the conventional logging data generally lack velocity. In addition, existing rock physics theory is difficult to accurately establish models due complex pore structure of sandstone reservoir. With rapid development artificial intelligence, attention mechanism that can increase sensitivity network characteristics has been widely used in...

As the exploration of unconventional reservoirs progresses, characterizing challenging formations like tight sandstone becomes increasingly complex. Anisotropic parameters play a vital role in accurately these reservoirs. In light this, this paper introduces an approach that uses dual-constraint anisotropic rock physics model based on compressional and shear wave velocities. The proposed method aims to enhance precision parameter calculations, thus improving overall accuracy reservoir...

Seismic wave exhibits the characteristics of anisotropy and attenuation while propagating through fluid-bearing fractured or layered reservoirs, such as carbonate shale bearing oil gas. We derive a linearized reflection coefficient that simultaneously considers effects caused by fractures fluids. Focusing on low attenuated transversely isotropic medium with vertical symmetry axis (Q-VTI) medium, we first express complex stiffness tensors based perturbation theory linear constant Q model at...

As the development of most domestic and international oilfields progresses, many fields have entered a mature phase characterized by high water cut recovery, with levels often exceeding 90%. Carbon/oxygen ratio logging has proven to be an indispensable tool for distinguishing oil layers from in complex environments, especially where salinity is low, unknown, or highly variable. This method become one effective techniques determining residual saturation cased wells, providing critical...

The fluid content in porous media can cause the anomalous dispersions and contribute to frequency-dependent reflections at low seismic frequencies. We present a practical methodology which simulate frequencydependent effects related mobility poroelastic on gathers. first obtain elastic tensors that are associated with characteristics permeable saturated rocks. Then reflection coefficients velocity used synthesize gathers by employing diffusive-viscous equation, take into account diffusive...

Secondary pores are the main reservoir space and transportation channel of oil gas in reef limestone reservoir. At present, method calculating secondary porosity is restricted by morphological characteristics spectrum, regional artificial influence, accuracy calculation. We present a new for nuclear magnetic resonance <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2"> <msub> <mrow> <mi>T</mi> </mrow> <mn>2</mn> </msub> </math> spectrum which calibrated casting thin section. begin with...

Summary Xu and White(1995)developed a method for estimating shear-wave velocity based on shaly sand formation which has been widely used. But the actual clastic rock contains variety of minerals so that by clay-sand model is obviously inaccurate. For Dongji sub-sag rich in calcium northern Dongying sag, error considerably big calcareous-bearing using Xu-White model. Analysing influence calcareous content estimation, established containing calcium. And accuracy log interpretation parameters...

Compared to conventional reservoirs, the prediction of pressure in ultra-deep tight sandstone formations is difficult. The seismic more challenging than well-logging prediction. main methods for include equivalent depth method, Eaton Fillippone formula, and modified versions. Among them, method widely used has good effectiveness. However, this relies on difficult-to-obtain normal compaction trend lines, which leads low accuracy space. To address issue, a combining collocated cokriging...

Abstract Transverse wave velocity plays an important role in seismic exploration and reservoir assessment the oil gas industry. Due to lack of transverse data from actual production activities, it is necessary predict based on longitudinal other parameters. This paper proposes a fusion network spatiotemporal attention mechanism gated recurrent unit (STAGRU) due significant correlation between parameters domain. In case tight sandstone reservoirs Junggar Basin, intersection plot technique...

Considering from the second law of thermodynamics, equation for entropy generation rate near a single-plate, representative stack inside thermoacoustic refrigerators was derived in this paper. It indicates that is produced due to heat transfer x-y direction finite temperature gradients and fluid friction irreversibility. Analysis global versus position stack, 2x/λ volume porosity, φ were carried out. The results demonstrated optimal within 0.8 <2x/λ <0.83, porosity 0.7.

Summary Numerical modeling is important in studying a variety of problems seismic wave propagation, many methods have been investigated for calculating the spatial terms equations, most widely used are classical finite difference (FD)method, Fourier pseudo -spectral (FPS)method and Finite Element (FE)method. It clear that each method has its own merits drawbacks. In order to study field characteristics 3D porous media mesoscopic scale, numerical simulation sedimentary rocks proposed...