Method for processing seismic exploration data in process of controlling full acoustic wave equation inversion

A technology of inversion process and seismic exploration, applied in the field of seismic exploration data processing, which can solve the problems of increasing computing cost and the number of iterations cannot be allowed.

Active Publication Date: 2010-01-20
PETROCHINA CO LTD
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Problems solved by technology

To use wave equation inversion for actual seismic data processing, the number of iterations required by the conventional steepest descent method or conjugate gradient method cannot be allowed, which means that the number of iterations is a bottleneck in the industrial application of wave equation inversion
[0005] In the existing steepest descent method or conjugate gradient method, the number of iterations can be reduced to a certain extent by using the linear search method or parabola fitting method, but at least two additional tasks for calculating the seismic wave field are added in each iteration, which significantly increases The computational cost of each step

Method used

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  • Method for processing seismic exploration data in process of controlling full acoustic wave equation inversion
  • Method for processing seismic exploration data in process of controlling full acoustic wave equation inversion
  • Method for processing seismic exploration data in process of controlling full acoustic wave equation inversion

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Embodiment 1

[0069] The theoretical model is a three-layer medium model, figure 2 The black curve in the middle is the variation curve of the parameters of the three-layer medium model with depth. image 3 Synthesize seismic data for the theoretical model and invert the data. The specific implementation steps are as follows:

[0070] 1. Collect theoretical model seismic data, extract common center point gather data, perform velocity analysis, time-domain layer velocity calculation and time-depth conversion, and obtain the initial model of bulk modulus and density in the depth domain;

[0071] 2. Based on the initial model, use the pseudospectral method to simulate the seismic wave field in the acoustic medium;

[0072] 3. Calculate the difference between the theoretical model and the initial model simulation data according to formula (5);

[0073] 4. Given δ=1.0e-6, calculate the error energy E according to formula (6), when E≤δ, stop the inversion and output the inversion result, if E>...

example 2

[0081] Example 2 is a gas field located in the west of my country. The gas field is a continental lacustrine deposit with well-developed underwater distributary channels. The target layer has a large burial depth, a long burial time, a high degree of diagenetic evolution, and poor physical properties. It is a typical gas field with low porosity and low permeability. The reservoir is thick vertically and distributed over a large area on the plane, but the single layer of effective sandstone is thin, with large lateral variation and strong heterogeneity. Sedimentary microfacies, physical property analysis and gas test results confirm that effective reservoirs are mainly developed in high-energy distributary channels in the delta plain and delta front subfacies.

[0082] Due to the small difference in P-wave velocity and impedance between the effective reservoir and surrounding rock, conventional seismic inversion results cannot meet the requirements of exploration. In 2006, we...

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Abstract

The invention relates to a method for processing seismic exploration data in the process of controlling full acoustic wave equation inversion. The method comprises the following steps: acquiring seismic data of a theoretical model to obtain a depth-domain bulk modulus and density initial model; simulating a seismic wave field in an acoustic medium by a pseudo-spectral method; calculating the difference of analog data of the theoretical model and the initial model; giving that delta is equal to 1.0 e-6; calculating error energy E; when E is less than or equal to delta, stopping inversion and outputting the inversion result; if E is more than delta, continuing the following steps; calculating residual error data; calculating the conjugated modification quantity of the bulk modulus and density model; calculating the modified step length to obtain the gradient; modifying the initial model; using the modified model data as a new initial model; carrying out automatic control on the inversion process to make the acoustic wave equation inversion stable, rapid and convergent and improve the inversion convergence speed by nearly five times than a routine method.

Description

technical field [0001] The invention relates to a seismic exploration data processing method for controlling the full-acoustic equation inversion process of seismic data, improving the inversion precision of the full-acoustic equation of the seismic exploration and the exploration ability of geological targets (especially lithologic stratum oil and gas reservoirs). Background technique [0002] Seismic inversion is to use the seismic data observed in the field to obtain the physical parameters of the formation, such as velocity, density and impedance, through mathematical methods and computing techniques. The full acoustic wave equation inversion directly adopts the propagation equation of seismic waves in the acoustic medium. Compared with wave impedance inversion, elastic impedance inversion and AVO inversion, it can deal with arbitrary complex heterogeneous media and improve the accuracy of seismic inversion And the ability to explore geological targets (especially lithol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28
Inventor 石玉梅
Owner PETROCHINA CO LTD
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