Tuning amplitude inversion method based on frequency division target iteration body
A tuning amplitude and inversion technology, which is applied in the field of tuning amplitude inversion based on the frequency division target iterative body, can solve the problems of fine research difficulties in thick and thin reservoirs, and the inability to effectively describe super-resolution reservoirs, and achieve simple implementation Effect
Active Publication Date: 2021-09-21
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology
The existing wave impedance inversion method has greatly improved the description of thick and thin reservoirs, and improved the effect of well-seismic matching, but there are certain artifacts in the extrapolation between wells; in the process of impedance profile and wavelet convolution, the acceptor Due to the influence of wave resolution, super-resolution reservoirs still cannot be effectively described, which brings difficulties to the fine research of thick and thin reservoirs
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[0055] Such as figure 1 , the specific implementation method includes the following steps:
[0056] (1) Analyze the frequency bandwidth of the seismic data. If the frequency bandwidth of the seismic data does not meet the requirements of the target reservoir thickness, the bandwidth of the seismic data needs to be processed, such as inverse Q filtering and other methods to widen the frequency bandwidth;
[0057] (2) Use the generalized S algorithm to divide the frequency of the seismic data to obtain a series of continuous discrete frequency volumes;
[0058] (3) Analyzing the thickness range of the target reservoir, according to the thickness range of the target reservoir, using the relational expression of frequency and thickness to calculate the corresponding frequency range, and selecting a suitable tuning frequency data body combination in step (2);
[0059] (4) use each data body optimized in step (3) as input, take the GR curve as the target curve, utilize the neural n...
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The invention discloses a tuning amplitude inversion method based on a frequency division target iteration body, and belongs to the technical field of petroleum seismic exploration and development. Firstly, frequency band preprocessing is carried out on seismic data, and the seismic data is ensured to have the frequency band width meeting a target reservoir thickness requirement; secondly, the original seismic data volume is divided into a series of tuning amplitude bodies through a generalized S algorithm; neural network inversion is performed on each single-frequency body by using the GR curve as a target curve, and further a well-seismic matching effect is strengthened; and finally, the optimized data volume is recombined by using a weighted tuning amplitude inversion method, and the two steps are repeated till that a data volume with an ideal well-seismic matching effect is obtained. By means of the method, the well-seismic mismatching problem of the thick and thin reservoirs can be effectively solved, and fine depiction of the thick and thin reservoirs is facilitated.
Description
technical field [0001] The invention belongs to the technical field of petroleum exploration seismic data processing and interpretation, and in particular relates to a tuned amplitude inversion method based on a frequency division target iterative volume. Background technique [0002] Thick and thin reservoirs exceed the seismic resolution, and appear as multiple reflection axes or no response on the seismic section, which affects reservoir characterization. Improving the display effect of thick reservoirs and enhancing the degree of well-seismic matching have always been one of the difficult problems in geophysical research. With the continuous advancement of oil and gas exploration and development, the accurate characterization of thick and thin reservoirs has attracted much attention: in the exploration stage, the accurate identification and fine characterization of thick and thin reservoirs is conducive to the rapid study of potential reserves in traps and provides a bas...
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IPC IPC(8): G01V1/50
CPCG01V1/50G01V2210/6169
Inventor 马佳国明君夏同星王建立周卿李文滨郄莹于茜王腾王波
Owner CHINA NAT OFFSHORE OIL CORP