3D anisotropic micro seismic interference inverse positioning method and 3D anisotropic micro seismic interference inverse positioning system
A three-dimensional and all-directional, positioning method technology, applied in the field of geophysical exploration, can solve the problems of limitation and large amount of observation data, and achieve the effect of improving calculation speed, improving calculation efficiency, high positioning accuracy and reliability
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Embodiment 2
[0064] In embodiment 2, on the basis of embodiment 1, said step 1 specifically includes the following steps:
[0065] Step 1.1: Establish a medium model according to the geological background conditions, the actual measured petrophysical test data and logging data;
[0066] Step 1.2: The medium model is discretized using a regular-shaped three-dimensional grid to obtain grid points.
Embodiment 3
[0067] In embodiment 3, on the basis of embodiment 1 or 2, described source function adopts Gaussian function on space, adopts Ricker wavelet on time, and the specific formula of described source function is:
[0068] s(x,y,z,t)=g(x,y,z)·f(t) formula (1)
[0069] Among them, f(t)=(1-2(πf 0 t) 2 )exp(-(πf 0 t) 2 ) formula (2)
[0070] g ( x , y , z ) = exp { [ - ( x - x 0 ) 2 + ( z - z o ) ...
Embodiment 4
[0072] In embodiment 4, on the basis of any embodiment of embodiment 1-3, said step 3 specifically includes the following steps:
[0073] Step 3.1: Substituting the differential in the three-dimensional anisotropic elastic wave equation with a differential approximation to obtain the corresponding propagation equation in the finite difference format, and the spatial sampling step and time sampling step in the propagation equation must satisfy the stability of the numerical format sexual condition;
[0074] Step 3.2: Use the regional decomposition method to bring the pressure value on each grid point into the propagation equation for calculation, and obtain the wave field value at each moment.
[0075] In this embodiment, further, in the step 3.2, using GPU to perform finite difference calculation on the three-dimensional anisotropic elastic wave equation at each calculation node by means of domain decomposition, the specific method for obtaining the wave field value at each mo...
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