Automatic geological construction constraint chromatography inversion method

Abstract

The invention discloses an automatic geological construction constraint chromatography inversion method. The method includes the following steps: extracting observation data; through the observation data, conducting back propagation in an initial speed model, carrying out prestack depth migration, and obtaining an initial migration profile; automatically extracting attributes of a stratigraphic texture from the initial migration profile; on the basis of the observation data, the initial speed model and the attributes of the stratigraphic texture, establishing a constraint chromatography equation set through ray tracking or through a sensitive kernel function; and carrying out iterative inversion to solve the speed update amount, updating the speed model, and then obtaining a final speed model after updating. The whole chromatography inversion iteration process is fully automatic and needs no human intervention, so the efficiency of an entire speed estimation process is increased, the human workload is reduced and the processing period is shortened. Underground geological inclination angles are introduced to constraint the speed model, so the speed model obtained through inversion is high in precision and satisfies requirements of subsequent migration imaging.

Description

technical field [0001] The invention relates to the field of seismic imaging and inversion in oil and gas exploration and development, in particular to an automatic geological structure constrained tomography inversion method. Background technique [0002] The goal of seismic exploration technology is to use seismic wave imaging technology to realize the positioning, identification and description of underground structures, and to provide intuitive and reliable basis for the exploration of underground oil and gas reservoirs. The seismic wave imaging technology mainly includes two aspects: migration imaging and inversion imaging. The essence of migration imaging is the process of using the observed seismic wave field records for forward and backward propagation, while eliminating the propagation effect of seismic waves, and finally obtaining an image of the subsurface geological structure; the essence of inversion imaging is based on observation data and geophysical model par...

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Problems solved by technology

[0007] Aiming at the manual picking of subsurface geological horizons on the migration section in seismic tomography inversion technology, and constraining the subsurface velocity model, this method is very time-consuming and labor-intensive in actual operation, and even fails to achieve the efficiency of exploration and development To solve the problem of demand, the present invention proposes an automated structure-constrained tomographic inversion method, which aims to avoid the heavy work of manually picking up underground geological horizons, so as to quickly and accurately build underground velocity models, making exploration and development more efficient

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