Crack identification method and device

Abstract

The invention provides a fracture identification method and device. The method includes: acquiring offset gathers in n directions; converting the offset gathers in n directions into angle gathers; superimposing angle gathers in the n directions according to a preset subangle range to obtain subangle superposition data; solving fracture density, fracture azimuth angle and anisotropy parameters according to the subangle superposition data; solving fracture fluid indicating factors according to the fracture density and anisotropy parameters; comprehensively identifying fractures according to the facture density, the fracture azimuth angle and the fracture fluid indicating factors. The fracture identification method has the advantages that the factures are comprehensively identified by solving three Ruger reflection coefficient equations and according to the data obtained by the equation solving, the problems that current industrial conventional fracture predicting methods are low in fracture identification precision and fracture fluid cannot be identified quantitatively are solved, the fractures can be identified precisely, and the fracture fluid can be identified quantitatively.

Description

technical field [0001] The invention relates to the field of seismic exploration, in particular to a fracture identification method and device. Background technique [0002] In the field of seismic exploration, the identification and prediction of fractures is of great significance. Because, in actual seismic exploration, fractures can act not only as fluid storage spaces, but also as fluid migration channels, connecting the scattered storage spaces in the reservoir. Therefore, the prediction of effective fractures is very important in actual exploration, and is the key to determining reservoir exploration and development. [0003] During specific exploration, due to the compaction of the overlying strata, the horizontal fractures and low-angle fractures almost disappear, and the remaining ones are generally high-angle fractures, and such fractures make the reservoir have azimuth anisotropy, that is, seismic wave The physical properties (such as: amplitude, speed and frequ...

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Problems solved by technology

However, because this item was not considered in the implementation, there are often technical problems that the prediction accuracy is not high and the fracture fluid cannot be quantitatively identified through the existing technology for fracture identification.

[0005] For the above problems, no effective solutions have been proposed so far

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