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Method for carrying out inversion for wave impedance of earthquake wave

A wave impedance inversion and seismic wave technology, applied in the direction of seismic signal processing, etc., can solve the problems of low resolution of seismic data, difficulty in meeting the requirements of reservoir prediction and reservoir description, and lack of resolution of logging data, etc.

Active Publication Date: 2006-07-05
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the vertical resolution of seismic data is not high, it is difficult to meet the requirements of reservoir prediction and reservoir description, but the seismic data has certain continuity and resolution in the horizontal direction
Although the vertical resolution of well logging data is very high, which can meet the requirements of reservoir prediction and reservoir description, the horizontal resolution of well logging data does not have the ability

Method used

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  • Method for carrying out inversion for wave impedance of earthquake wave
  • Method for carrying out inversion for wave impedance of earthquake wave
  • Method for carrying out inversion for wave impedance of earthquake wave

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0121] First, a trial calculation is performed using theoretically synthesized data. Figure 1(a) is a theoretical wave impedance profile, with CDP numbers ranging from 1 to 270 and a stratum thickness of 1000 meters, including 76 geological horizons. A thin interbed of about 1 m is a simulated geological section of actual oil recovery; Fig. 1(b) is the seismic section simulated by finite element seismic wave; Fig. 1(c) is the profile of the input initial wave impedance model; Fig. 1(d) is The profile of the wave impedance parameter inversion of the wave equation; Fig. 1(e) is a comparison chart of the wave impedance inversion with different parameter constraints (A is the wave impedance measured in the well, B is the wave impedance of the unconstrained inversion, and C is the wave impedance with the addition of constraints). Guess the wave impedance constrained by the low-frequency component of the model, D is the wave impedance constrained by adding well parameters at the sam...

Embodiment 2

[0123] Figure 2(a) is the profile of the original seismic data of the target layer in Lunnan, where the well is located on CMP910. (1) Spectrum analysis and seismic wavelet analysis are performed on the post-stack seismic data, and seismic particles are extracted from the seismic channel beside the well. (2) According to the known prior geological knowledge and drilling information in the seismic data, horizon interpretation is carried out, and the interpreted horizons are checked and corrected, smoothed and interpolated, so that the horizons are closed and Smooth; (3) Analyze the acoustic time difference curve and density curve of the well logging, edit and eliminate outliers and outliers, and based on the post-stack seismic data and interpreted horizons, known prior geological knowledge and drilling knowledge , to calibrate the sonic time difference curve and density curve of well logging, and calibrate the sonic time difference curve and density curve of well logging in the ...

Embodiment 3

[0125] Figure 3(a) is the profile of the original seismic data of the target layer in the Tazhong area, where the well is located on CMP355. (1) Spectrum analysis and seismic wavelet analysis are performed on the post-stack seismic data, and earthquakes are extracted on the seismic trace beside the well Wavelet; (2) Perform horizon interpretation on seismic data based on known prior geological knowledge and drilling knowledge, and perform inspection, correction, smoothing and interpolation on the interpreted horizon , so that the horizon is closed and smooth; (3) analyze the acoustic moveout curve and density curve of the well log, edit and eliminate the outliers and outliers, and according to the post-stack seismic data and the interpreted horizon, the known prior To test the geological knowledge and drilling knowledge, to calibrate the sonic time difference curve and density curve of the well logging, and to calibrate the sonic time difference curve and density curve of the w...

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Abstract

The invention is a seismic wave impedance inversion method, determining amplitude and phase spectrums of pos-stack seismic data, and extracting seismic subwaves on a near-well seismic channel and determining amplitude and phase spectrums, spectrum widths and master frequencies of the seismic subwaves; picking up seismic stratigraphic horizons corresponding to geological stratigraphic horizon and checking and correcting as well as smoothing and interpolating the picked horizons; demarcating logging acoustic time difference and density curves, and demarcating depth-domain logging acoustic time difference and density curves into time-domain ones, consistent with horizons of stacked seismic data, generating in-well wave impedances; making wavelet odd analysis and wavelet characteristic extraction on the stacked seismic data; providing high resolution wave impedance parameters for reservoir description in the exploration, development and recovery of oil fields.

Description

technical field [0001] The invention relates to reservoir prediction and reservoir description in the process of oil field exploration, development and production, and is a seismic wave impedance inversion method that provides high-resolution wave impedance parameters. Background technique [0002] Seismic exploration is to artificially excite seismic waves at a series of points on the ground, and the seismic waves propagate underground. When encountering the wave impedance interface (that is, the wave impedance difference surface of the upper and lower formations), the seismic waves are reflected, and the direction of seismic wave propagation changes. It begins to propagate upwards, and receivers are placed on a series of receiving points on the ground to receive the seismic wave data that propagates upwards. This is the positive process of seismic exploration. The seismic wave data received by the ground receiver not only contains the information of the wave impedance inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 高少武赵波田振平范祯祥
Owner BC P INC CHINA NAT PETROLEUM CORP
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