Reservoir imaging technique based on full-frequency-band seismic information mining

Abstract

A reservoir imaging technique based on full-frequency-band seismic information mining is an oil seismic exploration data processing and interpreting technique, and utilizes the time-frequency decomposition method-the third type generalized S conversion which can accurately describe the local hierarchical structure of seismic signals. Firstly, an original three-dimensional seismic data volume is mapped into a four-dimensional full-frequency-band time-frequency energy data volume, a time-frequency amplitude data volume and a time-frequency phase data volume which all contain time, space and frequency domain; a vertical seismic profile, a time slice, a horizon slice and a stratum slice are extracted from two data volumes by utilizing the geological horizon information and the drilling and logging information; and meanwhile, on the basis of the above data volumes, a full-frequency-band energy difference slice and a reservoir thickness relative to time detection slice which are based on full-frequency-band information are further generated. The technique provided by the invention not only utilizes the information in a passband during conventional seismic data processing but also explores low-frequency and high-frequency information outside the passband, and is used for directly indicating the oil-gas reservoirs and analyzing imperceptible changes of the thickness, the space distribution and the internal structure of reservoirs, thereby improving not only the utilization ratio of the information in the seismic exploration data but also the reliability of seismic data interpretation.

Description

technical field [0001] The invention relates to the field of petroleum seismic exploration data processing and interpretation, and is a technique for directly indicating oil and gas reservoirs, detecting the thickness, spatial distribution and internal structure of oil and gas reservoirs by utilizing and mining seismic data full-band time-frequency and spatial domain information. Background technique [0002] In seismic exploration, when seismic waves propagate in the underground medium, their propagation path, vibration intensity and waveform will undergo complex changes with the elastic properties and geometric shapes of the medium they pass through. Therefore, the ground will receive signal components such as P waves, S waves, large amplitude divergent surface waves, and various noises that propagate through different paths. They not only have different arrival times, but also have different kinematics and dynamics characteristics, and after Multiple reflections, refracti...

AI Technical Summary

Problems solved by technology

[0004] Conventional seismic data spectrum analysis generally only utilizes the information of the seismic signal within the passband, and seldom utilizes the information less than the low cutoff frequency and greater than the high cutoff frequency, making the utilization rate of information in seismic exploration data less than 30%.

Therefore, both the low-frequency and high-frequency information of seismic exploration signals have great application potential, while conventional seismic data processing not only does not make full use of the information outside the passband, but often destroys the effective information within the passband

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