89 results about "Transverse isotropy" patented technology

A method for estimating seismic velocities in vertically transversely isotropic media includes generating an initial estimate of vertical interval velocity and interval normal moveout velocity with respect to depth from seismic data. An initial estimate is generated of a first anisotropy parameter with respect to depth. The first anisotropy parameter is related to the interval normal moveout velocity and the interval vertical velocity. An initial estimate is generated with respect to depth of a second anisotropy parameter. The second anisotropy parameter is related to the first anisotropy parameter and an interval anelliptic parameter. A first tomographic inversion is performed with respect to the interval normal moveout velocity and the second anisotropy parameter at a constant value of the first anisotropy parameter until travel time differentials reach minimum values. Layer depths are adjusted with the initial estimate of vertical interval velocity. Using values of the second anisotropy parameter determined in the first tomographic inversion, a second tomographic inversion is performed of interval normal moveout velocity and the first anisotropy parameter with respect to depth. The adjusted layer depths, interval normal moveout velocities and interval vertical velocities are again adjusted and interval anelliptic parameters are calculated from the second tomographic inversion.

A method for predicting mechanical properties of a transverse isotropic region of a rock formation traversed by a well bore including running a logging tool in the well bore; the mass percentages of minerals present in the rock formation surrounding the well bore are measured with the logging tool. The density of the minerals present in the rock formation surrounding the well bore is determined. The porosity of the rock formation surrounding the well bore is measured. From the porosity and the measured mass percentages and density of the minerals, all the transverse isotropic elastic coefficients of the rock formation are determined in real time.

The invention relates to an anisotropic reverse time migration method for a quasi-P wave equation in a transverse isotropy with a vertical axis of symmetry (VTI) medium. The method comprises the following steps of: (1) performing discrete differentiation on a first-order quasi-P wave equation in a two-dimensional VTI medium and a perfect matched layer (PML) absorption layer boundary equation by adopting staggered meshes to obtain high-order difference formats of forward continuation and reverse continuation of the two equations; (2) performing numeric calculation to obtain a forwards-continued wave field of a shot point and a reverse time continued wave field of a receiver point, and performing normalized correlation operation on the two wave fields to obtain a migration imaging result of each imaging point in a model; and (3) extracting common imaging point gathers from migration results to obtain a final migration profile. By the method, a problem about the migration imaging of intensive transverse speed variation and a high dip angle stratum can be solved; and the influence of anisotropy of the medium is also taken into account, and the good imaging effect of longitudinal wave data acquired from an anisotropic region can be achieved by an anisotropy-theory-based migration method.

The invention provides a manual shale physical model and a manufacturing method and application of the manual shale physical model. The manufacturing method of the manual shale physical model includes the first step of mixing adhesives and stone powder evenly, wherein the adhesives are epoxy resin adhesives, the stone powder comprises 10%-70% of quart, 10%-80% of kaoline, 4%-25% of organic carbon powder and 3%-10% of calcite, and the use amount of the adhesives is 5%-35% of the total mass of the stone powder, the second step of filling a mould with mixtures of the adhesives and the stone powder, placing and fixing the mould on a pressure gauge horizontally, adjusting the perpendicular pressure intensity to 80-300 MPa, fixedly placing the mould for more than 24 hours for preliminary solidifying, and the third step of demoulding, drying a shale sample subjected to preliminary solidifying at the temperature ranging from 30 DEG C to 50 DEGC and obtaining the manual shale physical model. The obtained manual shale physical model is compact, has specific porosity and density, has anisotropic characteristics, has transverse isotropic characteristics and can provide a reliable basis for comparison and verification of research results of actual shale reservoir strata.

A method is disclosed for depth migrating seismic data. The method includes pre-stack time migrating the seismic data to form a stacked, time migrated image. The stacked, time migrated image is demigrated, and post-stack depth migration is then performed on the demigrated image. In some embodiments, the pre-stack time migration and the demigration account for ray bending in vertically transversely isotropic media.

The invention discloses a determination method for mechanical parameters of transverse isotropy shale reservoir rocks. The determination method comprises the following steps: carrying out an X-ray diffraction experiment to determine rock mineral constituents of a certain well depth; inverting rock porosity of the certain well depth by utilizing acoustic logging information; determining the stacking density of clay by utilizing the determined rock mineral constituents and the porosity; determining rigidity matrixes of transverse isotropy rocks of shale under a scale 0 by using a closed cycle-correction-identification method; determining the rigidity matrixes of the transverse isotropy rocks of the shale under a scale 1 and a scale 2 by utilizing a pore elastic theory; and substituting the rigidity matrixes into inversion models of Young modulus, poisson ratio and shear modulus and determining the mechanical parameters of the rocks. According to the determination method, the mechanical strength parameters of the rocks are inverted by using the X-ray diffraction experiment, so that the inversion result is accurate on the basis of establishing the experiment; field rock fragments are easy to obtain so that the determination method has the characteristics of time conservation, labor conservation and money conservation in the aspect of experiment operation.

An integrated semiconductor device for measuring a magnetic field, comprising: a Hall sensor, a first lateral isotropic sensor having a first stress sensitivity and a first temperature sensitivity, a second lateral isotropic sensor having a second stress sensitivity and a second temperature sensitivity, optional amplifying means, digitization means; and calculation means configured for calculating a stress and temperature compensated Hall value in the digital domain, based on a predefined formula which can be expressed as an n-th order polynomial in only two parameters. These parameters may be obtained directly from the sensor elements, or they may be calculated from a set of two simultaneous equations. A method of obtaining a Hall voltage signal, and compensating said signal for stress and temperature drift.

A method for survey data processing compensates for visco-acoustic effects in TTI medium in an RTM method. This method employs propagating in conjugate medium to yield correct phase, and acoustic wave propagation to yield correct amplitudes through adaptive matching filtering.

The present invention is directed towards a golf ball which comprises a core, a cover and at least one improved intermediate layer disposed between core and the cover. The intermediate layer a composite of at least two dissimilar materials that is radially oriented and transversely isotropic so that the layer provides unique performance properties when the ball is struck with different clubs.

The invention provides an orthotropic dielectric fluid factor and fracture parameter inversion method. The method comprises the following steps: deducing a rigidity matrix of an ortho-symmetric anisotropic fracture medium by using a vertical transverse isotropic medium under a dry rock background according to fracture weakness; with utilization of hypotheses of weak anisotropy and small fracture weakness, deducing a new expression of weak anisotropy approximate rigidity of a saturated fluid rock in an orthogonal medium by combining an anisotropy Gassmann equation; acquiring a PP wave linearized reflection coefficient for fluid and fracture parameter decoupling in the orthogonally symmetrical weak anisotropic medium by combining stiffness disturbance and scattering theories; and with logging information as prior information, realizing elastic impedance pre-stack inversion changing with offset and azimuth angle by using a partial incident angle stacked by azimuth seismic data under Bayesian framework. According to the invention, Reliable results can be provided for fluid identification and fracture characterization; and technical supports are provided for seismic wave propagation research, oil and gas development and seismic disaster prevention.

A computer implemented method including a numerical model of a region of the earth modeling the acoustic behavior of that region. The method implements an acoustic wave propagator allowing the simulation of the propagation of pure P-waves in transversal isotropic media. The propagator can be applied to applications such as seismic forward modeling, reverse time migration and other two-way wave-equation based applications.

The invention relates to a device and a method for measuring shearing property of a transverse isotropic material. The device comprises a thin-wall tubular test piece, a fixed outer tube, a rotary inner tube, an upper positioning ring, a lower positioning ring, structure adhesive, an upper connecting disc, a lower connecting disc, a flange and a torque sensor. The transverse isotropic material is processed into the thin-wall tubular test piece, the axial direction is a direction I, a direction II and a direction III (transverse direction) are mutually perpendicular to each other in a cross section, and the mechanical properties of the material are identical. The rotary inner tube and the fixed outer tube are respectively bonded to the inner wall and the outer wall of the test piece, the outer tube is fixed, and a torsion torque is applied to the inner tube, so that the test piece only generates a shearing force in the thin-wall annular cross section. The shearing stress-strain curve of the test piece in the directions (transverse) II and III can be acquired by virtue of the torque of the outer tube, a torsion angle of the inner pipe and the outer wall surface of the inner tube, so that the shearing modulus and shearing strength of the test piece in the transverse isotropic direction can be obtained. The relative twisting of the inner wall and the outer wall of the thin-wall tube is ingeniously utilized, so that the shearing force is only generated in the transverse isotropic direction of the material, the parameter is intuitive and convenient to measure, and the test data is accurate.

The invention discloses an inversion method and system of an anisotropic rock physical model. The inversion method comprises the following steps of establishing a rock physical model with a transverseisotropic elastic characteristic; based on the Bayesian theory, obtaining the posterior probability distribution; establishing an inversion objective function based on the rock physical model and theposterior probability distribution; and obtaining an optimal solution of the fracture density parameter based on the objective function. The method has the advantages that an anisotropic rock physical modeling method is provided; the influence of anisotropic clay and directionally arranged micro cracks on shale anisotropy can be comprehensively considered, rock physical inversion is carried out on the basis of a Bayesian framework with prior information and logging parameters as constraints, the elastic parameters of clay minerals and the density of the directionally arranged cracks are obtained, and therefore the anisotropy characteristics of the clay minerals are further discussed.

The invention provides an extraction method and an extraction device for extracting the converted wave angle gather of transversely isotropic media. The method comprises the steps of based on a co-conversion point gather of pre-stack converted waves, obtaining a converted-wave stacking velocity Vc2, a vertical velocity ratio gamma 0, an equivalent speed ratio gamma eff and a converted wave anisotropic parameter Chi eff through the velocity analysis progress; at a k-th sampling point, processing each seismic trace in the co-conversion point gather to obtain an incident angle theta k at the k-th layer of the pre-stack converted waves; assigning k to be 1 to n, and conducting the above treatment for each k value so as to obtain a converted-wave incident angle of each seismic trace at each sampling point; classifying seismic traces of the same converted-wave incident angle into the same incident angle gather so as to obtain a converted wave angle gather, wherein n represents the number of total sampling points.

The invention discloses a method for detecting residual stress of a fiber-texture film, and belongs to the technical field of characteristic characterization of film materials. According to the invention, the problem of inaccurate testing of the residual stress of the fiber-texture film by adopting a traditional method is solved. Based on the transverse isotropy of the fiber-texture film, a specific solution is provided for residual stress analysis of the fiber-texture film; and through coordinate system conversion, elastic tensor of a sample under a sample coordinate system is directly calculated, so that the relationship between macroscopic residual stress and strain under the sample coordinate system can be established according to the generalized Hooke law. By adopting the theoreticalmodel of the relationship between the residual stress and the strain established by the invention, the problem that the residual stress of the fiber-texture film is not accurately tested by the traditional X-ray diffraction stress testing method can be effectively solved; and the method can be applied to detection of the residual stress of the fiber-texture film.