叠前地震资料高分辨率非线性AVA反演
[Abstract]:AVA inversion is based on the theory of layered elastic media scattering matrix, using prestack non-superposition or angle partial superposition data to extract elastic parameters of underground rock, so as to achieve reservoir prediction and fluid identification. However, the following problems still exist in the practical application: (1) the ability of the inversion results to distinguish the underground geological bodies is not high, and the vertical resolution is not high and the boundary position and the edge of the geological body can not be clearly represented. It is difficult to meet the need of fine description of seismic geology of small geological bodies; (2) in the process of AVA inversion, some approximate assumptions should be made for the velocity ratio of P-S wave to shear wave, for example, the velocity ratio is usually taken as 0.5, thus linearization is essentially a nonlinear AVA inversion problem. However, the problem of not meeting this assumption is often encountered in practical application. (3) the present prestack seismic inversion is based on the assumption of small jump change of formation elastic parameters, and is realized by using the first order approximation of the scattering matrix of layered elastic media. When the local layer elastic parameters change greatly, the inversion based on the first order approximation is difficult to obtain reasonable inversion results (suitable for the large change of elastic parameters). In order to solve the above problems, this paper makes an in-depth study on the conventional AVA inversion method. By introducing the AVF information hidden in the seismic data as an overcomplete dictionary of seismic signal representation, the information of amplitude variation with frequency, especially the information of high frequency and low frequency, is fully utilized in seismic data. Improve the resolution of inversion. By introducing total variation regularization constraints, the formation boundary position and geological body edge are clearly inversed. By taking the velocity ratio of P-S wave as an unknown parameter of the model, the nonlinear inversion method and strategy are used to solve the problem that the ratio of P-S wave velocity to velocity does not satisfy the constant assumption. By using high-order Taylor series expansion of the scattering matrix, the high-order approximate expression of the scattering matrix is obtained, which breaks through the limitation of the small jump hypothesis of elastic parameters in the conventional pre-stack seismic inversion.
【学位授予单位】:中国石油大学(华东)
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:P631.44
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