Indoor dynamic combination method for marine single-point acquired seismic data

Abstract

The present invention discloses an indoor dynamic combination method for marine single-point acquired seismic data, which comprises the following processing steps: collecting the original high-density data; performing attenuation by using the adaptive swelling-noise pressing method; performing random noise suppressing by using the noncausal spatial prediction filtering method; removing linearity interference by using the FX-domain prediction fitting suppressing linearity interference method; performing phase-shift time-difference correction dynamic combination by using the phase spectrum correction dynamic combination method; outputting the record of a shot-gather. Directing to the noise characteristics of high-density marine single-point acquired seismic data, the invention effectively connects the adaptive swelling-noise pressing method, the noncausal spatial prediction filtering method and the FX-domain prediction fitting suppressing linearity interference method in series with thephase spectrum correction dynamic combination, so that various interference can be effectively suppressed; both the energy and continuity of reflected signals are significantly strengthened, and the signal-to-noise ratio is significantly improved.

Description

technical field [0001] The invention relates to a data processing method in seismic exploration of oil and gas fields, in particular to a method for indoor dynamic combination of seismic data acquired at a single point on the sea. Background technique [0002] Single-point acquisition high-density seismic exploration technology is one of the rapidly developing geophysical prospecting technologies in recent years. Single-point acquisition high-density seismic exploration technology has unique advantages in improving seismic data and seismic exploration quality. High-density single detector The detector acquisition effectively overcomes the shortcomings of field combination acquisition, well maintains the originality and richness of the reflection signal, and provides high-quality raw data and more abundant data processing space for high-precision exploration and lithological seismic exploration. The single-point high-density acquisition technology using digital geophones has ...

AI Technical Summary

Problems solved by technology

[0003] At present, the main problems in the processing of high-density seismic data are: 1. The signal-to-noise ratio of the original seismic data collected in the field is low, and both coherent noise and random noise are serious, and the conventional denoising method has many inadaptability; 2. Massive The processing period of the seismic data is long, and the requirements for computer hardware and parallel algorithms are increased. The combination of field geophones reduces the quality of the original seismic data due to the influence of inter-track time difference. It is necessary to perform indoor time difference correction combination without reducing the resolution. Reduce the amount of post-processing data and further improve the signal-to-noise ratio of the data

3. The conventional indoor combination method can be combined after eliminating various time differences such as static correction, dynamic correction and residual time difference correction, and finally perform reaction correction processing. In this process, initial velocity analysis and dynamic correction processing are required. Problems such as low precision, far offset dynamic calibration stretching, and large amount of calculation

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