Observation system optimization method and device for signal-to-noise ratio consistent energy illumination of target layer

Abstract

The invention provides an observation system optimization method and device for signal-to-noise ratio consistent energy illumination of a target layer. The method comprises the steps that a near-surface signal-to-noise ratio library is established; a target layer illumination result is combined on the basis of the near-surface signal-to-noise ratio library to form a signal-to-noise ratio illumination analysis result based on the target layer; and consistency processing is carried out on the illumination result to optimize an observation system. According to the invention, the signal-to-noise ratio weight factor is added on the basis of conventional target layer ray illumination; in addition to considering the influence of a velocity field on the illumination, the influence of factors suchas near-surface structure, lithology, excitation parameters and surface fluctuation elevation on the illumination result are mainly considered; the design optimization of the observation system basedon the signal-to-noise ratio consistent energy illumination of the target layer is more in line with the actual situation, and can better guide the design and evaluation of a field observation system;and collected seismic data have higher energy and signal-to-noise ratio, which ensures the data quality and improves the exploration accuracy.

Description

technical field [0001] The invention belongs to the application field of seismic exploration technology, and relates to an observation system optimization design technology for illumination of a target layer in consideration of the signal-to-noise ratio factor, so that the designed observation system is more in line with actual conditions. Background technique [0002] Observation system design is to rationally arrange the geometric position relationship between receiver points and shot points according to geological tasks, so that the collected seismic data can meet the requirements. Observation system design is divided into two-dimensional and three-dimensional, but three-dimensional seismic exploration is the most effective means to solve complex geological problems, and is also the main means of oil and gas exploration. The design of three-dimensional observation system is closely related to imaging quality and exploration cost. The basis for the design of the observatio...

AI Technical Summary

Problems solved by technology

[0004] The traditional observation system evaluation methods based on the CRP (common reflection point) coverage times of the target layer and elastic wave illumination energy statistics do not consider the objective fact of the signal-to-noise ratio of seismic data. The CRP and illumination of the target layer assume the same or both It is 1, without considering the influence of signal-to-noise ratio under different lithology, buried depth, well depth, excitation mode and other conditions near the surface, so it cannot meet the actual needs of acquisition design

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