Earthquake prediction and description method of highly-shielded fracture-vug type storage layer containing coal

Abstract

The invention discloses an earthquake prediction and description method of a highly-shielded fracture-vug type storage layer containing coal, and the earthquake prediction and description method is mainly used for earthquake resource target processing and fine description of the storage layer. The method comprises the steps of: firstly analyzing coal layer characteristics through forward modeling, and providing basis for positioning of practical resource coal layers; then utilizing generalized S conversion time varying wavelet spectral simulation to improve the resolution of a target layer; then utilizing a layer position control multi-channel dynamic matching tracking method for carrying out highly-shielded stripping, and protruding weak signals; and finally utilizing a crack detection method, absorption attenuation analysis and wave impedance inversion to carry out contrast analysis, and obtaining a storage layer prediction result. The earthquake prediction and description method can well solve the problems that cracks are difficult to identify, the fracture-vug type storage layer is high in transverse heterogeneity, and the storage layer is low in porosity and low in permeability; in addition, the storage layer prediction precision is improved.

Description

technical field [0001] The invention relates to an earthquake prediction and description method for coal-bearing strong shielding fracture-cavity reservoirs, belonging to the field of seismic data interpretation. Background technique [0002] Affected by the shielding of multiple sets of coal seams or coal lines, the seismic reflections of carbonate rock formations generally have defects such as weak energy and serious multiple wave interference; the main frequency of seismic data is low and the resolution is low, which undoubtedly increases the difficulty of fine interpretation. Difficulty; and this type of reservoir has various types of storage space, superimposed pores and fractures, fractures are basically micro-fractures, low fracture density, high filling degree, and weak logging response, forming a complex configuration relationship. Carbonate fracture-vuggy reservoirs are generally low-porosity, low-permeability tight reservoirs, with strong lateral heterogeneity, co...

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Problems solved by technology

[0002] Affected by the shielding of multiple sets of coal seams or coal lines, the seismic reflections of carbonate rock formations generally have defects such as weak energy and severe multiple wave interference; the main frequency of seismic data is low and the resolution is low, which undoubtedly increases the difficulty of fine interpretation. Difficulty; and this type of reservoir has various types of storage space, superimposed pores and fractures, fractures are basically micro-fractures, low fracture density, high filling degree, and weak logging response, forming a complex configuration relationship

Carbonate fracture-cavity reservoirs are generally low-porosity, low-permeability tight reservoirs, with strong lateral heterogeneity, conventional attributes have method sensitivity problems, and inversion methods also have large uncertainties in lateral prediction sexual problems

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