Bidirectional out-of-line rolling measuring seismic exploration and acquisition method

Abstract

The invention provides a bidirectional out-of-line rolling measuring seismic exploration and acquisition method, which is applicable to the seismic exploration and acquisition in urban areas or hazards. The invention adopts light-tonnage controllable source and/or shothole source to stimulate earthquake waves and adopts an earthquake instrument of over 5000 paths and a moving-coil type geophone to receive earthquake signals. The method in the invention comprises the following steps: A. arranging construction point location; B. designing out-of-line observation system; C. implementing bidirectional out-of-line rolling observation; and D. implementing bidirectional out-of-line rolling measuring, and the key lies in accurately determining the position of the out-of-line shotpoint, and the out-of-line shotpoint and the normal shotpoint correspond to identical receiving arrangement. The invention has the effects of utilizing limited urban shothole shotpoint to repeat implementation, strengthening the stimulating energy of medium and deep layers, improving the signal to noise ratio of medium and deep layers in seismic exploration and acquisition, obviously improving energy in medium and deep layers in seismic exploration and acquisition data, obviously improving signal to noise ratio, and simultaneously ensuring construction time effectiveness and saving cost.

Description

technical field [0001] The invention relates to the technical field of petroleum geophysical prospecting seismic exploration acquisition, in particular to a seismic exploration acquisition in an urban area or an obstacle area, and is a method for increasing the excitation energy of deep layers in seismic data in an urban area or an obstacle area. Background technique [0002] At present, in the field of petroleum geophysical exploration, seismic exploration is the most effective exploration method. The principle of seismic exploration is to generate seismic waves down through artificial ground excitation, reflect and refract when meeting the underground impedance surface and return to the ground, receive seismic wave information through ground geophones for data analysis, study the characteristics of underground geological structures, and even the characteristics of underground fluids, and realize the detection of underground The purpose of oil and gas storage. [0003] Sei...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a two-way non-longitudinal rolling observation seismic exploration and acquisition method, aiming at the fact that there are few shot points that can be excited by well shot in the urban area, and the distribution of shot points is uneven, resulting in insufficient energy in deep layers of data collected by seismic exploration. Two-way non-longitudinal rolling observation, the use of urban areas can implement repeated excitation of well shots, and enhance the overall excitation energy of middle and deep layers in seismic exploration and acquisition

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