41 results about "Anisotropic elasticity" patented technology

A method for estimating principal stresses of a subterranean formation from seismic data. In one embodiment, rock strength parameters from seismic data of the formation is first determined to calculate the anisotropic elastic properties of the formation. The three principal stresses of the formation: vertical stress, minimum horizontal stress, and maximum horizontal stress, is determined using at least the calculated anisotropic elastic properties and the rock strength parameters of the formation. From the estimated principal stresses, the differential ratio of the maximum and minimum horizontal stresses can be determined to indicate optimal zones for hydraulic fracturing. In another embodiment, a tectonic strain term is introduced to calibrate the estimated principal estimated stress to a known reference point. In yet another embodiment, hoop stress is incorporated to estimate the fracture initiation pressures.

Method for predicting physical properties of a source rock formation wherein an inclusion-based (103) mathematical rock physics model (101) is constructed that treats organic matter as solid inclusions, solid background, or both, and relates anisotropic elastic and electric properties of source rock to in-situ rock and fluid properties (102). The model is calibrated with well log data and may be used to forward model calculate effective anisotropic elastic (104.1) and electrical (104.2) properties of the source rock formation, or by inversion (441-442) of sonic and resistivity log data to calculate total organic carbon (423) in terms of a difference (421) between elastic and electrical properties of the source rock.

A method is disclosed for the generation and application of anisotropic elastic parameters. Anisotropic elastic parameters are generated such that, for selected seismic wave and anisotropy types, an approximation to the anisotropic modeling of seismic amplitudes is obtained by the equivalent isotropic modeling with the anisotropic elastic parameters. In seismic modeling, wavelet estimation, seismic interpretation, inversion and the interpretation and analysis of inversion results anisotropy are handled with isotropic methods, when earth elastic parameters utilized in these methods are replaced by the anisotropic elastic parameters.

Method for modeling anisotropic elastic properties of a subsurface region comprising mixed fractured rocks and other geological bodies. P-wave and fast and slow S-wave logs are obtained, and an anisotropic rock physics model of the subsurface region is developed (21). P- and fast and slow S-wave logs at the well direction are calculated using a rock physics model capable of handling fractures and other geological factors (22). Calculated values are compared to measured values in an iterative model updating process (23). An upscaled ID model is developed by averaging elastic properties in each layer using an upscaling theory capable of handling at least orthorhombic anisotropy (24). The ID model may be used to generate synthetic seismic response for well ties or AVO modeling (25). Further, a method is disclosed for estimating anisotropy parameters from P- and fast/slow S-wave logs from one or more deviated wells.

The invention relates to an azimuthal anisotropic elastic impedance based crack detection method. With a Connolly elastic impedance equation and a Ruger equation serving as the basis, anisotropic elastic impedance and crack parameters and the dominance relation formula between crack density and crack azimuth are deduced. A set of elastic impedance based crack inversion process is established, and anisotropic parameter information is added into inversion well logging constraint. Numerical model testing is performed in the method, the inversion result is roughly identical to the theoretical value, and the inversion density shows high noise immunity. The method has the advantages that anisotropic elastic impedance can be used, the crack density and the crack azimuth are calculated simultaneously, good application effects are provided in actual data, and high practicality is provided.

The invention relates to a three-dimensional anisotropy elastic wave numerical simulation method and system. The method comprises the following steps: 1, a medium model is established to carry out grid discretization on the medium model to obtain a plurality of grid points; 2, a seismic source function is calculated, and a pressure value at each grid point is calculated according to the seismic source function; 3, a three-dimensional anisotropy elastic wave equation is converted into a propagation equation, and the pressure value at each grid point is taken into the propagation equation as substitutes to conduct calculating to obtain a wave field value at each moment; and 4, according to the wave field value, a calculating area of each grid point is determined; area division is carried out; and data exchange is carried out on divided area boundary data to complete elastic wave numerical simulation. According to the invention, acceleration of three-dimensional elastic wave numerical simulation under a complex medium is realized through utilization of a GPU; a realization scheme of accelerating data transmission through utilization of GPU Direct technology is realized; a large amount of data copying from a CPU to the GPU and from the GPU to the CPU is avoided; and communication bottleneck optimization is realized.

A single piece garment for those having a distended abdomen, said garment extending upwards from the groin to beneath the breasts. The garment comprises an inner layer and an outer layer. The inner layer has several elastomeric fabrics having differing modulus of elasticity. A section beneath the abdomen is formed from an anisotropic elastomeric fabric with a low modulus of elasticity that supports a distended abdomen. Side panels extending upwards from the abdomen across the hips to the lumbar region are made from an isotropic elastomeric fabric having a moderate modulus of elasticity. These connect to a rear panel across the lumbar of an anisotropic elastomeric fabric having a moderate modulus of elasticity. The directionality of the anisotropic elastomeric fabrics is from the abdomen across the hips to the lumbar region. The entire garment has an outer layer of an isotropic elastomeric fabric with a relatively low modulus of elasticity except for an elastomeric fabric across the lumbar region formed from a high modulus anisotropic elastomeric fabric.

The invention discloses a method and device for calculating Rayleigh surface wave dispersion response by forward modeling of a wave equation. A phase velocity spectrum of a surface wave, namely, the dispersion response of a Rayleigh surface wave in a frequency domain, is calculated by adopting high-precision higher-order finite difference, rationally setting boundary conditions of a free surface, effectively suppressing false reflection of an external boundary of a model and adopting a Radon transformation method. According to the method and the device disclosed by the invention, Rayleigh surface wave dispersion response characteristics are calculated by forward modeling simulation of finite time-domain difference based on an anisotropic elastic wave equation, wherein the geological model can be an anisotropic and non-horizontal layered medium, and the free surface can be a freely-fluctuated surface. The method and the device can be used for researching the Rayleigh surface wave dispersion response characteristics of complex media.

The invention relates to a preparation method and application of anisotropic elastic auxetic fabric. The preparation method adopts three-dimensional modeling software to model and introduce the modelinto a 3D printer which can print out bi-component materials, and the 3D printer prints an auxetic fabric which is softer and more elastic in the lateral direction than the longitudinal material. Theprepared anisotropic elastic auxetic fabric can be used as clothing, backpacks, masks, artificial blood vessels, filter materials and the like. The preparation method has the characteristics of convenient processing, integrated molding and good material cohesiveness, and extensive available raw materials.

The invention discloses a rock mass engineering parameter calculation method and system based on statistical rock mass mechanics. According to the calculation method, field test data of rock uniaxialcompressive strength, deformation parameters and a rock mass structural surface network and the structural surface friction angle serves as the basis, engineering design parameters such as the anisotropy elasticity modulus, the poisson ratio, the permeability ellipsoid and the permeability coefficient and anisotropy ratios and weakening coefficients of various parameters are calculated, and all-space-direction rock mass quality grading is conducted. By means of the calculation method, more reliable calculation parameters can be provided for engineering design through comparison and revision ofa proper quantity of in-situ test data, the workload and investment for large in-situ tests can be greatly reduced, and the period of early-stage investigation of a project can be remarkably shortened, so that huge engineering and economic benefits are generated.

The invention relates to a method for determining the anisotropic elastic modulus of a schist, and aims at providing the method for determining the anisotropic elastic modulus of the schist so as to provides a reliable foundation for accurately estimating the stability of a tunnel of the deeply burned schist and late support. The technical scheme disclosed by the invention is that the method for determining the anisotropic elastic modulus of the schist is characterized by comprising the following steps of: a, carrying out scene nondestructive sampling; b, obtaining three groups of rock cores drilling in parallel direction, in vertical direction and in a direction in which boreholes and the schist form certain included angles; c, respectively carrying out a uniaxial compression test on the three groups of rock cores, so as to obtain an intact stress-strain curve of each rock core, and obtain the mean elastic modulus and the mean poisson ratio of each group of rock cores; d, inserting the test result obtained from the step c into the following formula to determine variable G'; and e, inserting E, E', v' and G' into the formula, and then taking the inverse number, so as to obtain a curve of which the elastic modulus of the loading direction changes along the included angles beta. The method is suitable for deeply buried tunnel engineering.

The invention provides a fractured reservoir parameter inversion method based on orientation elastic impedance difference. The method removes effects of isotropic parameters on orientation anisotropic elasticity impedance, further extracts orientation difference caused by the isotropic parameters, and solves the problem in the prior art of inaccurate inversion caused by narrow difference negligence caused by the fact that orientation elasticity impedance change caused by the anisotropic parameters is small when the isotropic parameters and the anisotropic parameters are inverted simultaneously. Orientation difference is amplified simultaneously, the inversion stability is improved while inversion accuracy of the anisotropic parameters is not affected, and the method provides reliable guarantee for recognition of fractured reservoir fluid recognition.

The invention discloses a method, a system and a device for detecting an anisotropic elastic constant of a material, and a storage medium. The method comprises the steps of obtaining deformation displacement and strain information of the material through the full-field strain measurement technology, establishing multiple groups of different virtual fields based on a characteristic function virtualfield method, and analyzing the deformation displacement and the strain information based on the virtual fields to finally detect the anisotropic elastic constant of the material. The system comprises a measurement module, an obtaining module, a detection module, a processing module and a display module. The device comprises a memory for storing programs, and a processor for loading the programsto perform the method. By using the method disclosed by the invention, multiple mechanical parameters of the material can be obtained at one time, thereby greatly reducing the input of the cost of a mechanical test of the material, and improving the analysis working efficiency of the material by workers. The method, the system and the device disclosed by the invention can be widely applied to thetechnical field of material detection.

The invention relates to a diffusion-kurtosis-imaging-based radial kurtosis anisotropic quantitative method. The method comprises: according to original data, a tensor is estimated by a diffusion kurtosis imaging model; according to a diffusion tensor matrix D, a radial plane is defined; distribution of a diffusion coefficient and a kurtosis coefficient in the radial plane are obtained; and anisotropy of a radial kurtosis Kp is calculated. According to the method provided by the invention, after preprocessing on a collected MRI signal, calculation is carried out based on the method to obtain a kurtosis distribution anisotropy index in the radial plane based on a diffusion tensor and a kurtosis tensor, wherein the index is capable of reflecting the structural geometrical characteristic of the object in the cross section and reflecting the structural characteristic that is more accurate than diffusion information. With the index, the neural white-matter microstructural abnormity, the non-uniform characteristic of the anisotropic elasticity at the cross section, tissue development, and pathogeny structure changing can be reflected precisely based on several kinds of analyses like a statistic analysis and a classification algorithm.

The invention discloses an elastic imaging method and device for measuring anisotropic elastic properties of nerves. The method includes the following steps: allowing a subject to adopt a certain fixed body position, and keeping the body position stable; respectively placing an ultrasonic probe along a nerve fiber direction and a direction perpendicular to the nerve fiber direction; in the above two cases, emitting simulation to the nerves in a certain way; performing imaging on nerve fiber/nerve cross sections by using the ultrasonic probe at a certain pulse repetition frequency, and obtaining a particle velocity field by a signal processing process; and further obtaining nerve wave propagation in two cross sections, and analyzing the wave propagation signals to obtain results for characterizing anisotropy of the nerves to be tested. The method can characterize the anisotropic elastic properties of the superficial peripheral nerves with larger diameters in a non-destructive, non-invasive and quick manner, the measured parameters can quantitatively describe the anisotropy of the nerves, and early diagnosis of nerve-related diseases can be performed.

The invention discloses an orthotropic shale brittleness index prediction method. The method comprises the following steps of measuring longitudinal wave velocities in six directions and transverse wave velocities in three directions; calculating the anisotropic rigidity coefficient of the shale; determining a stiffness matrix CORT of orthotropic shale under the stratum coordinates; determining the anisotropic elastic modulus and Poisson's ratio of the shale; determining a flexibility matrix SORT of orthotropic shale under the stratum coordinates; calculating the shale elasticity modulus and Poisson's ratio under the borehole observation coordinates; and calculating the brittleness index of the orthotropic shale. According to the method, the anisotropy characteristics of the shale are considered, the brittleness index of the orthotropic shale formation is evaluated from the angle of the actual drilling hole, a defect that the traditional shale brittleness index neglects the anisotropy influence is overcome, and the anisotropy characteristics of the shale brittleness index and the characteristics of the shale brittleness index influenced by the hole track can be reflected more accurately; scientific basis and decision support can be provided for drilling and fracturing of the shale gas horizontal well.

The invention relates to an orthotropic alternatively laminated composite damping material, which is characterized by being an orthotropic alternatively laminated composite damping material with dispersed multiple damping layers formed by alternatively laminating damping material thin layers and high-strength anisotropic elastic material thin layers. The composite damping material in the invention has the advantages of light and thin structure, greatly improving structure damping value, strong designability, high structure strength, easy manufacturing and less equipment investment, and is an ideal path to searching and developing a novel environment functional material with composition of material and structure. The composite damping structure material with the structure damping valve more than 0.5 can be obtained by a DMA frequency scanning test at room temperature, the damping value thereof is 20 times of that of the existing fiber reinforced resin matrix composite material. The invention is suitable for damping and sound proof aspects in the fields of aviation, ships, engineering machinery, buildings and the like, and can determine parameters of damping products according to actual demands so as to determine to process specific products.