Equal-travel-time-interval seismic acquisition and observation method and system

Abstract

The invention relates to an equal-travel-time-interval seismic acquisition and observation method and system. The method is characterized by comprising the following steps: (1) determining a target stratum in a three-dimensional grid-shaped seismic wave speed model; (2) selecting a certain earth surface seismic source point on the earth surface, and determining x-coordinate data and y-coordinate data of an earth surface detection point corresponding to the earth surface seismic source point; (3) calculating the corresponding relation between the travel time of seismic waves reflected at the target stratum and the emergent position of the seismic wave propagation ray on the earth surface by adopting a ray tracing method; (4) determining an x-coordinate sequence or a y-coordinate sequence ofthe earth surface detection point by adopting an equal travel time interval method; (5) determining a y-coordinate sequence or an x-coordinate sequence of the earth surface detection point by adopting a conventional seismic acquisition method or an equal travel time interval method; and (6) arranging and combining the x-coordinate sequence and the y-coordinate sequence of the earth surface detection point to obtain a coordinate sequence of the surface detection point. The method and the system can be widely applied to the technical field of petroleum seismic exploration.

Description

technical field [0001] The invention relates to a method and system for seismic acquisition and observation with equal travel time intervals, and belongs to the technical field of petroleum seismic exploration. Background technique [0002] Seismic exploration is one of the main tools for oil and gas resource exploration. The main process of seismic exploration includes data acquisition, seismic data processing and data interpretation. Among them, the data acquisition consists of three tasks: the determination of the seismic observation system at the land seismic exploration data acquisition site, the deployment of seismic sources and receivers in the field according to the determined plan, and the excitation and reception of seismic waves. First, the determination of the seismic observation system is carried out indoors, and then Determine the best placement of the source point and the surface receiver point, and then arrange the source and receiver in the field according t...

AI Technical Summary

Problems solved by technology

The equal interval sampling method can be applied to most seismic geological conditions, and has the advantage of being easy to operate in the field, but it is not always the optimal sampling method under all conditions, especially when the sampling density of surface receiver points is low, it cannot be obtained without increasing the sampling density. Effectively improve the quality of seismic records under the condition of seismic acquisition cost

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