Design method for enhancing seismic waves to stimulate illumination

Abstract

The invention mainly relates to a design method for enhancing seismic waves to stimulate illumination in a complex structure region. The design method comprises the following steps that (1) exploration area data are collected, a geological model of the complex structure region is established, and a geological target is determined; (2) an artificial seismic source is arranged at the target position, and illumination simulation is conducted through a wave equation forward modeling method; (3) statistics of illumination energy, upwards spread to the ground surface, of the seismic waves is conducted when illumination simulation is conducted; (4) an optimal encryption shot region on the ground surface is determined according to the statistical result of the illumination energy on the ground surface; (5) the main direction of emergence, on the ground surface, of the seismic waves stimulated by a target seismic source is calculated through a poynting vector, and the spread direction of a seismic wave beam stimulated by a phase-controlled seismic source is determined; (6) combined stimulation parameters of the phase-controlled seismic source are designed on the basis of a phase-controlled theory and the theoretical signal-to-noise ratio maximization principle of combined seismic sources; (7) a construction scheme for enhancing the illumination energy provided by the seismic waves for the target on the ground surface in the complex structure region is determined. The design method is good in application effect and can reduce the collection cost.

Description

technical field [0001] The invention relates to a seismic exploration technology in the field of petroleum and natural gas exploration, which is applied to the design of an observation system for enhanced seismic wave excitation illumination in complex structural areas. Background technique [0002] As oil and gas exploration and development continue to extend to complex structural areas, the seismic and geological conditions faced by oil and gas exploration are becoming more and more complex, mainly manifested in severe surface undulation, large surface velocity changes, complex underground geological structures, deep buried exploration targets, The development of high-speed nappes and other factors lead to complex seismic wave fields and difficulties in imaging geological targets. [0003] The conventional field seismic acquisition and observation system design based on the assumption of horizontal layered media and horizontal surface has been unable to meet the requiremen...

AI Technical Summary

Problems solved by technology

However, the seismic directional lighting analysis only quantitatively calculates the illumination of the target geological body by seismic waves in various directions, so as to screen out the favorable direction for the target geological body illumination, but it does not substantially improve the illumination energy of the target geological body

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