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2-the second step: Preparation for kinematic processing

Determining the kinematic parameters of the waves

Kinematic parameters of the reflected waves are determined by calculating the horizontal stacking velocity spectra using a special local operator DHS. This can greatly improve the quality of the spectra (and thus determine the value and reliabilityVTransform).

With high-speed analysis of network profiles, carrying it in layers in the system tallies time horizons, we have linked to the square root model and the corresponding agreed at the whole area of ​​work, the effective parameters of the reflected wavest0 andVTransform.

This technology allows for several advantages, in particular, in determining the kinematic parameters of the waves in the complex areas of interference, using the result of solving the inverse problem on the horizon. This allows the use of a priori geological information at the earliest and most critical stages of processing.

Preparation for kinematic processing

High-speed analysis

High-speed analysis

Determining the kinematic parameters of the waves

In this material velocity analysis was based on two-dimensional hyperbolic approximation of the locus of the reflected waves

surface t0 horizonh5» (t0≈ 650)

surface t0 horizon (t0≈ 650)

surface t0 horizon (t0≈ 650)

surface VTransform the horizon (t0≈ 650) was built on two-dimensional cross sections of the parameterVTransform

surface VTransform the horizon (t0≈ 650) was built on two-dimensional cross sections of the parameterVTransform

Information about the spatial description of the field since the reflected waves, is coded surface t0 and the three coefficients of the surfaces

Vx, Vy, Vxy.surface Vx horizon (t0≈ 650)

surface Vx horizon (t0≈ 650)

surface Vy horizon (t0≈ 650)

surface Vy horizon (t0≈ 650)

surface Vxy horizon (t0≈ 650)

surface Vxy horizon (t0≈ 650)

range of speeds and speed curve for multiple waves

range of speeds and speed curve for multiple waves range of speeds and speed curve after subtraction of multiples

Procedure for nonstationary adaptive attenuation of multiple waves

  • field modeling of multiple waves;
  • subtract multiples of the field from the source.

Procedure for nonstationary adaptive attenuation of multiple waves

before subtracting multiples andMDTVafter subtraction of the multiples andMDTV

Transient selective predictive deconvolution

Transient selective predictive deconvolution

after pre-treatment after subtracting multiples andMDTV

Building tolstosloistoy depth-velocity model

feature of the solution 3D inverse problem is to control the quality of the solution, not only in terms of accuracy of the mapping solution obtained in the original data, but as far as lawfully chosen class of models in which the result obtained.
In other words, one of the main problems is to verify how properly selected locally homogeneous layered model of the medium in which the estimated valueVINT(x,y) andh(x,y).
In two dimensions, this requires the simultaneous use of two ad hoc methods of solving the inverse problem.
In the case of 3D enough observations to get a decision one way only.
The necessary redundancy to build a test of the adequacy of the model contains a surface t0(x,y).
signs of the derivatives of (t0,x) and the (t0,y ) allow one to construct a local planar reflecting boundary element.
If the layer is homogeneous, the calculated values ​​for this element of the derivatives of (t0,x ) and the (t0,y ) must coincide with the observed ones.
In the construction of the criterion used by more and statistics.
The inverse problem is solvedR-method under the assumption of local homogeneity of the layer.
etog Justiceо assumption is verified at each point of each layer of a special threshold criterion.
Eslи test is less than the threshold, then the result can be treated with confidence, if there are more - or toо complicate the model, or refine the input data.

surface depth of reflecting boundaries surface of the interval velocity
surface depth of reflecting boundaries surface of the interval velocity

Decisions of a three-dimensional kinematic problem

section interval velocity cube

section interval velocity cube

section of the cube interval velocities - 2

section of the cube interval velocities - 2

deep surface of the horizon

deep surface of the horizon

surface V-interval on the horizonIII

surface V-interval on the horizonIII

section of the cubeV-interval at a depth ofh=1940m

section of the cubeV-interval at a depth ofh=1940m

section of the cubeV-interval at a depth ofh=2570 m

section of the cubeV-interval at a depth ofh=2570 m

Retrieving dynamic deep cuts

Depth Migration was performed in the built environment layered model (taking into accountм index and the adaptation of the aperture at all included in the model boundaries).

underlying dynamic sections

underlying dynamic sections

deep dynamic cut and cut deep horizontal cubeh=2550 m

deep dynamic cut and cut deep horizontal cubeh=2550m

hereinafter - third stage: Post-migration treatment