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Method for predicting reservoir by relaxation factor pre-stack seismic inversion

A pre-stack seismic and relaxation factor technology, which is applied in the fields of petroleum geophysical exploration and reservoir exploration, can solve problems affecting accuracy, achieve the effect of improving inversion accuracy and convergence conditions

Active Publication Date: 2012-06-27
PETROCHINA CO LTD
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Problems solved by technology

The difference between the parameter coefficient items leads to the difference in the strength of the seismic response of each parameter, which will affect the inversion accuracy of each parameter.

Method used

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  • Method for predicting reservoir by relaxation factor pre-stack seismic inversion
  • Method for predicting reservoir by relaxation factor pre-stack seismic inversion
  • Method for predicting reservoir by relaxation factor pre-stack seismic inversion

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Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0027] figure 1 A flow chart of a method for reservoir prediction using relaxation factor pre-stack seismic inversion provided by an embodiment of the present invention, consisting of figure 1 It can be seen that the method includes:

[0028] S101: Collect the pre-stack seismic angle gather data in the seismic work area and the corresponding logging data in the seismic work area. Select N in the seismic work area TRACE Seismic traces, select N in each sei...

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Abstract

The invention provides a method for predicting a reservoir by relaxation factor pre-stack seismic inversion. The method comprises the following steps of: A, acquiring pre-stack seismic angle gather data and corresponding logging data in a seismic work area; B, generating an initial model of longitudinal wave velocity, transverse wave velocity and density according to a prior geological layer and the logging data; C, superposing the pre-stack seismic angle gather data to form n superposed seismic angle gathers at different angles; D, extracting corresponding n subwaves according to the n superposed seismic angle gathers; and E, gradually extracting a superposed seismic angle gather, the corresponding subwave and the like from the n superposed seismic angle gathers and the corresponding n subwaves. A relaxation factor generated by the longitudinal wave velocity, the transverse wave velocity and the density is added into the inversion process to predict the reservoir, so that the accuracy of predicting the reservoir is improved, and the advantageous position of oil and gas is more obviously indicated.

Description

technical field [0001] The present invention relates to the field of petroleum geophysical exploration, in particular to the technical field of reservoir exploration, and specifically relates to a method for reservoir prediction using relaxation factor pre-stack seismic inversion. Background technique [0002] Seismic inversion is an important subject in the field of reservoir geophysical exploration. In the prior art, the following methods are mainly used for earth inversion: [0003] 1. Post-stack seismic inversion [0004] Traditional post-stack seismic inversion is to convert seismic data into wave impedance profiles for reservoir prediction, but this method requires the reservoir to have identifiable characteristics in wave impedance, and the post-stack inversion results are affected by the initial model larger. With the continuous improvement of exploration and development technology, the characteristics of reservoirs are becoming more and more complex, and more and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 魏超郑晓东李劲松
Owner PETROCHINA CO LTD
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