Angle domain pre-stack offset data processing method aiming to detect oil-gas-bearing property of reservoir

Abstract

The invention relates to an angle domain pre-stack offset data processing method aiming to detect the oil-gas-bearing property of a reservoir. The method comprises the following steps: 1, a ground earthquake is simulated, and an earthquake wave signal is acquired by a data collector and is subjected to pretreatment through an relative-fidelity amplitude processing process; 2, a local target imaging range is selected according to reservoir projection requirements by input equipment, and an angle domain imaging array is subjected to initialization; and 3, the earthquake wave data subjected to the pretreatment in the step 1 is gradually input into a processor through the data collector, and the largest imaging range corresponding to an earthquake wave is determined through the processor according to a center spot position and migration aperture confinement, so as to judge whether the largest imaging range is in the selected local target imaging range or not, if yes, a step 4 is performed, otherwise, the next earthquake wave is input. Compared with the prior art, the invention has the advantages that the local angle domain pre-stack time offset imaging is realized based on the local direction characteristics of the earthquake wave; and Hi-Fi incident angle domain common imaging point gathers can be directly obtained in the offset process.

Description

technical field [0001] The invention relates to a data processing method for angle-domain pre-stack migration, in particular to a data processing method for angle-domain pre-stack migration aimed at detecting oil and gas in reservoirs. Background technique [0002] Seismic exploration is by artificially exciting seismic waves, and the wave field signals propagating underground arrive at surface geophones or sensors and are recorded. These wavefield records carry response information related to subsurface geological structure, rock elastic properties, and pore fluid properties. According to the propagation law of seismic waves in the formation rocks, using reasonable wave field propagation models and seismic data processing, inversion and interpretation methods, combined with the geological understanding of the research area to find geophysical detection methods for fossil energy such as oil and natural gas. [0003] On the one hand, seismic exploration uses the kinematic in...

AI Technical Summary

Problems solved by technology

However, as the lateral non-uniformity increases, it is necessary to implement multiple local one-dimensional ray tracing according to the velocity model, and then interpolate to obtain the travel time, angle and weighting coefficient information of the actual position corresponding to the ray path during imaging, which is much less efficient and less flexible. , and the accuracy is related to the density and velocity variation characteristics of ray tracing

This type of method does not currently have an extended anisotropic media case

Images