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Multi-resolution wave impedance inversion method based on model constraints

A wave impedance inversion, multi-resolution technology, applied in seismology and seismic signal processing for logging records, can solve the problems of application limitation, low resolution, poor anti-noise ability, etc.

Active Publication Date: 2014-01-01
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conventional post-stack wave impedance inversion technology has the following disadvantages: low resolution, multi-solution inversion results, poor anti-noise ability, not suitable for quantitative calculation of reservoir parameters and prediction of thin reservoirs, and limited application.

Method used

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  • Multi-resolution wave impedance inversion method based on model constraints
  • Multi-resolution wave impedance inversion method based on model constraints
  • Multi-resolution wave impedance inversion method based on model constraints

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Experimental program
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Embodiment 1

[0087] This embodiment is an embodiment of using the method of the present invention for theoretical model data inversion, and the specific steps are as follows:

[0088] 1) Input the post-stack seismic data, obtain the sampling rate and time length, and preprocess the seismic data to improve the signal-to-noise ratio of the seismic data;

[0089] 2) The scale factor is determined according to the spectral characteristics of the seismic data, and the number of inversion parameters is determined by the scale factor;

[0090] 3) Input the interpreted horizon data and logging data, and calculate the wave impedance curve in the well: the formation velocity Vp is calculated from the acoustic time difference logging data, and the other logging data is the density logging data Den, using the wave impedance formula Z=Vp *Den calculates the wave impedance curve in the well;

[0091] 4) Interpolate and extrapolate the impedance curve in the well under the control of the interpretation ...

Embodiment 2

[0100] This embodiment uses actual seismic data. The wave impedance inversion method based on the model constraints of the present invention is used for inversion, and the steps are the same as those in Embodiment 1.

[0101] Figure 2(a) is the post-stack seismic data of this embodiment, Figure 2(b) is the initial model of this embodiment, and Figure 2(c) is the inversion result of this embodiment. The inversion results from Fig. 2(c) can show high-frequency information, and the inversion results show thin layer information, reflecting the contact relationship of strata, for fine reservoir description, lithological (and stratigraphic) trap oil and gas reservoirs and very It provides important reference materials for conventional oil and gas reservoirs (coalbed methane, shale gas, etc.).

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Abstract

The invention provides a multi-resolution wave impedance inversion method based on model constraints, and belongs to the field of seismic exploration and development of oil gas and coal bed methane. The method comprises the steps that an initial model used for wave impedance inversion is established by utilizing seismic records, well-logging data and seismic interpretation horizon data, and scale factors are led in to speed up the computation of algorithms and to reduce the solution multiplicity of the inversion. According to the method, the ground seismic data, the well-logging data and the seismic interpretation horizon data are organically combined, and a certain adaptability on the inversion of faults, the inversion of wedge-shaped stratums and the inversion of thin stratums is achieved; furthermore, the method has the advantages of being high in computational speed, good in stability, high in computational accuracy and strong in anti-noise capacity.

Description

technical field [0001] The invention belongs to the field of seismic exploration and development of oil and gas and coalbed methane, and in particular relates to a multi-resolution wave impedance inversion method based on model constraints. Background technique [0002] Seismic exploration technology is the most widely used geophysical method in oil and gas exploration. It uses the changes in the velocity, amplitude, frequency, phase, and waveform of seismic waves propagating in different media to analyze and predict the distribution range of oil and gas reservoirs. layer properties. With the continuous advancement of oil and gas exploration and development, conventional oil and gas exploration has shifted from the original search for structural oil and gas reservoirs to the search for lithologic oil and gas reservoirs and hidden oil and gas reservoirs, and unconventional oil and gas exploration and development (such as coalbed methane, shale gas, and tight sandstone gas, et...

Claims

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Application Information

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IPC IPC(8): G01V1/40G01V1/28
Inventor 白俊雨岳承琪宋志翔苏凌肖云飞
Owner CHINA PETROLEUM & CHEM CORP
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