Method for recognizing gouging point of geologic body based on generalized S transformation

Abstract

The invention discloses a method for identifying a geological tip vanishing point based on generalized S transformation, the method is realized based on a generalized S transformation model of two-parameter adjustment, and the method comprises the following steps: S1, obtaining seismic data with multiple seismic records from seismic data; S2, calculating the seismic data according to the improved generalized S transformation model to generate seismic time-frequency spectrum data; S3, acquiring a plurality of single-frequency bright spot profiles of improved generalized S transformation according to the seismic time-frequency spectrum data; S4, superposing the single-frequency bright spot profile and the seismic data profile to obtain a geological tip vanishing point; and S5, comparing geological pinch-out point depicting results to complete pinch-out point identification. According to the method, serious interference of complex refraction and diffraction accompanied by reflection of seismic waves near the pinch-out point on reflected signals is weakened, the position of the pinch-out point on a seismic section is recognized more accurately, the recognition capacity of seismic exploration on the pinch-out point is improved, and therefore, evaluation of the oil reservoir is promoted.

Description

technical field [0001] The invention belongs to the field of petroleum seismic exploration, in particular to a method for identifying pinch-out points of geological bodies based on generalized S transform. Background technique [0002] In the field of seismic exploration, with the development of technology and the efforts of several generations of geophysicists, the target of oil and gas exploration is not limited to conventional oil and gas resources, and the exploration and development of oil and gas are advancing to deep and complex hidden oil and gas reservoirs. For the pinch-out of sand bodies, since the formation gradually becomes thinner toward the pinch-out point, the reflection of seismic waves near the pinch-out point will be accompanied by complex refraction and diffraction phenomena, which makes the reflected signal received by the ground seriously interfered, and the earthquake It is difficult to accurately identify pinch-out points on the profile, which reduces...

AI Technical Summary

Problems solved by technology

Traditional time-frequency analysis methods such as short-time Fourier transform (STFT), continuous wavelet transform (CWT), and S-transform (ST) can achieve the purpose of signal analysis in the time-frequency domain, but are limited by window functions and uncertainties. Influenced by the principle, it is difficult for traditional methods to have high time-frequency resolution

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