A Method for Seismic Prediction and Description of Fracture-cavity Reservoirs with Strong Coal Shielding
A technology for earthquake prediction and strong shielding, applied in seismic signal processing and other directions, can solve problems such as method sensitivity, low resolution, multiple wave interference, etc. range effect
Active Publication Date: 2017-08-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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[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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[0026] The invention provides an earthquake prediction and description method for coal-bearing strongly shielded fracture-cavity reservoirs, which is mainly used for target processing and fine description of seismic data of such reservoirs. This method first analyzes the characteristics of the coal seam through forward modeling to provide a basis for the positioning of the actual coal seam; then uses the generalized S-transform time-varying sub-spectrum simulation to improve the resolution of the target layer; Shielding is peeled off to highlight weak signals; finally, the fracture detection method, absorption attenuation analysis and wave impedance inversion are used for comparative analysis to obtain reservoir prediction results.
[0027] The present invention will be further described below in conjunction with accompanying drawing.
[0028] Such as figure 1 As shown, the seismic prediction and description method of the coal-bearing strong shielding fracture-cavity reservoi...
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The invention discloses an earthquake prediction and description method for coal-bearing strong shielding fracture-cavity reservoir, which is mainly used for target processing and fine description of seismic data of this type of reservoir. This method first analyzes the characteristics of the coal seam through forward modeling to provide a basis for the positioning of the actual coal seam; then uses the generalized S-transform time-varying sub-spectrum simulation to improve the resolution of the target layer; Shielding is peeled off to highlight weak signals; finally, the fracture detection method, absorption attenuation analysis and wave impedance inversion are used for comparative analysis to obtain reservoir prediction results. The invention can better solve the problems of difficult identification of fractures, strong lateral heterogeneity of fracture-cavity reservoirs, low porosity and low permeability of reservoirs, and improve the accuracy of reservoir prediction.
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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IPC IPC(8): G01V1/28
Inventor张军华张在金张宏李军董宁陈业全季玉新范腾腾肖文李宇航
OwnerCHINA UNIV OF PETROLEUM (EAST CHINA)