Imaging method of wide angle reflection waves of deep carbonate reservoirs in large desert region

Abstract

The invention discloses an imaging method of wide angle reflection waves of deep carbonate reservoirs in a large desert region. The method comprises steps of acquiring original single shot record information, and defining a seismic data processing observation system according to the record information, wherein the record information comprises seismic data including the wide angle reflection waves; picking up the primary arrival of seismic waves and carrying out chromatography static correction on the wide angle reflection waves; compensating the amplitude of the seismic data; carrying out noise compression on the wide angle reflection waves; carrying out resolution increasing processing on the wide angle reflection waves; carrying out high-order dynamic correction on the wide angle reflection waves and carrying out speed analysis; cutting the seismic data and keeping the wide angle reflection waves; carrying out speed modeling on the wide angle reflection waves; and optimally selecting imaging parameters of the wide angle reflection waves so as to obtain migration imaging result data of the wide angle reflection waves. According to the invention, according to the seismic data spreading mechanism, based on the wave field analysis, the wide angle reflection waves in the single shot records can be effectively recognized; and by use of the wide angle reflection wave imaging, the quality of the deep seismic data imaging is improved.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas seismic exploration in complex exploration areas, in particular to a wide-angle reflection wave imaging method for deep carbonate rock reservoirs in a large desert area. Background technique [0002] In the central and eastern part of the Tarim Basin, the sand dunes and sand beams on the surface are undulating, the height difference changes drastically, the underground geological structure is complex, and the faults are developed, which makes the seismic data in this area have a low signal-to-noise ratio and poor data quality. During the acquisition of seismic data, with the continuous increase of seismic traces and offsets, there is a set of effective reflection information in the field raw data at far offsets, that is, wide-angle reflections. Because wide-angle reflections are refracted and other interferences Covered, so it is not easy to be recognized. [0003] Under certain strat...

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Problems solved by technology

[0012] The purpose of the present invention is to address the defects of the prior art and provide a wide-angle reflection wave imaging method for deep carbonate rock reservoirs in large desert areas, which is used to solve the problem of mixing wide-angle reflection waves with other waves in the prior art and being regarded as Invalid information is cut off, rarely used, etc.

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