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Basis tracking prestack seismic inversion method based on reflection coefficient precision

A pre-stack seismic and reflection coefficient technology, applied in the field of seismic exploration, can solve the problems of low vertical resolution and inability to use far-angle seismic data, and achieve improved vertical resolution, good sparse representation ability and noise immunity, The effect of improving inversion stability

Active Publication Date: 2021-06-25
ZHEJIANG UNIV
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Problems solved by technology

The present invention overcomes the problems that the far-angle seismic data cannot be used in the previous pre-stack AVA / AVO inversion and the vertical resolution is not high, and can be applied to thin-bed or thin-interbed reservoir geological models, and the elastic parameters can be extracted with high precision and high resolution Inversion result

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  • Basis tracking prestack seismic inversion method based on reflection coefficient precision
  • Basis tracking prestack seismic inversion method based on reflection coefficient precision
  • Basis tracking prestack seismic inversion method based on reflection coefficient precision

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Embodiment Construction

[0081] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0082] Take a well logging model test as an example to illustrate:

[0083] Such as figure 1 As shown, it is an implementation process of a pre-stack multi-parameter inversion method suitable for shale and other models with strong horizontal bedding structure, which specifically includes the following steps:

[0084] Step 1: The acquired pre-stack seismic data should retain as much mid-to-long-distance seismic data as possible. The invention uses the precise Zoeppritz equation as the forward operator for synthetic seismic data, which can effectively overcome the defects of the traditional approximate forward operator, namely the assumption of close angle and weak reflection. Because the mid-to-far angle seismic data is more sensitive to shear wave velocity and density information, it can help to obtain more accurate shear wave veloc...

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Abstract

The invention relates to a basis tracking prestack seismic inversion method based on reflection coefficient precision. The method comprises the following steps: 1, obtaining pre-stack angle gather seismic data and post-stack seismic data of a thin or thin interbed sand shale reservoir; 2, obtaining an inversion initial elastic parameter model; 3, calculating based on a Zoeppritz equation to obtain a time-angle domain reflection coefficient sequence, and constructing a target function related to the inversion elastic parameter model; 4, updating the inversion elastic parameter model; 5, if the residual error of the synthetic pre-stack angle gather seismic data and the actual pre-stack gather data reaches an iteration threshold value, outputting an inversion elastic parameter model, and if not, entering step 6; and 6, updating the number of iterations, and returning to the step 3 to enter the next iteration until the iteration is terminated. The method can be suitable for thin or thin interbed reservoir geologic models, and elastic parameter inversion results are extracted in a high-precision and high-resolution mode.

Description

technical field [0001] The invention belongs to the technical field of seismic exploration and belongs to the field of multi-parameter inversion of seismic data, and in particular relates to a base-tracking pre-stack seismic inversion method based on an accurate Zoeppritz equation. Background technique [0002] With the continuous deepening of oil and gas exploration and development, and the increasing global demand for oil and gas resources, thin or interbedded reservoirs have gradually become the focus of exploration and development personnel. However, the seismic response characteristics of thin or thin interbedded reservoirs usually have a tuning effect, and it is difficult for traditional prestack seismic inversion methods to extract relevant information from seismic data. [1] . Therefore, it is of great research significance and application value to carry out high-precision and high-resolution pre-stack seismic inversion suitable for thin beds and thin interbeds for e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30G01V1/36
CPCG01V1/307G01V1/362
Inventor 黄广谭
Owner ZHEJIANG UNIV
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