Sand body thickness prediction method based on spectrum inversion and sand body thickness prediction system thereof

Abstract

The invention discloses a sand body thickness prediction method based on spectrum inversion and a sand body thickness prediction system thereof. The prediction method comprises the steps that seismic wavelet and stratum reflection coefficient are acquired from original seismic data; an objective function is established, and spectrum inversion is performed according to the objective function, the seismic wavelet and the stratum reflection coefficient after parity decomposition so as to acquire an even component reflection coefficient sequence; new seismic data are synthesized according to the seismic wavelet, the even component reflection coefficient sequence and the objective function; and the sand body thickness is predicted according to the new seismic data. The spectrum inversion result resolution is better than that of the conventional inversion so that the thin layer geological target identification effect can be enhanced, the operation cost is low and the application effect is great.

Description

technical field [0001] The invention belongs to the technical field of seismic reservoir prediction for petroleum exploration, and in particular relates to a sand body thickness prediction method and system based on spectrum inversion. Background technique [0002] With the deepening of exploration and development of oil and gas reservoirs, the development targets are no longer structural oil and gas reservoirs dominated by thick reservoirs, but more complex oil and gas reservoirs with thinner reservoirs (mostly, the thickness of a single sand body is less than 10 meters) . [0003] Reservoirs with a thickness greater than 1 / 4 of the wavelength have a tuning effect, and the combination of impedance inversion and pseudoacoustic inversion of logging data can meet the requirements of reservoir identification. Affected by the current seismic resolution, when the main frequency of the seismic wavelet is about 30 Hz, it is difficult to distinguish the top and bottom seismic refle...

AI Technical Summary

Problems solved by technology

However, the thickness of channel sand bodies in current exploration and development strata is often less than 1 / 4 wavelength, and the lateral changes of sedimentary facies are rapid, so the identification and prediction of channel thin sand bodies are becoming more and more prominent.

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