Carbonatite oil and gas reservoir crack earthquake detection method

Abstract

The invention belongs to the field of exploration geophysics, and particularly relates to a carbonatite oil and gas reservoir crack earthquake detection method. The method comprises the steps of: carrying out amplitude versus offset and azimuth angle analysis, speed versus offset and azimuth angle analysis, frequency versus offset and azimuth angle analysis respectively based on pre-stack seismic azimuth angle dataset, further carrying out ellipse fitting respectively to obtain a crack development azimuth angle, and predicting a crack development azimuth through a seismic attribute comprehensive analysis way; carrying out quality factor parameter extraction, anisotropic parameter inversion and non-hyperbolic moveout velocity analysis respectively based on pre-stack seismic trace dataset and shear wave velocity data, and predicting a reservoir crack development region by comprehensively utilizing the parameters above through a seismic attribute comprehensive analysis way. The carbonatite oil and gas reservoir crack earthquake detection method can give more comprehensive consideration to the geology of the reservoir and the physic characteristics of the globe, and the estimated crack azimuth and the predicted crack development region are more exact.

Description

Technical field [0001] The invention belongs to the field of geophysical exploration, and specifically relates to a method for seismic detection of fractures in carbonate rock oil and gas reservoirs. Background technique [0002] Carbonate fractured reservoirs refer to reservoirs in which the oil and gas storage spaces and seepage channels are mainly fractures. It occupies a very important position in several carbonate oil and gas fields discovered in my country in recent years, and is used in oil and gas exploration and development. It continues to show its importance. The seismic technology plays an irreplaceable role in the petroleum industry due to its comprehensive advantages in exploration costs and coverage area. However, due to the limitation of resolution and other factors, it is almost impossible to find cracks directly on seismic data. Therefore, crack detection methods for seismic data have always been a major problem to be solved in the petroleum industry. [0003] Ca...

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Problems solved by technology

On the one hand, this method only uses the dynamic characteristic (amplitude) information of the reflected seismic wave, ignoring the kinematic characteristic (velocity) information of the reflected seismic wave; more importantly, this method inverts the upper and lower reservoir Poor anisotropic dynamic parameters (such as poor impedance), it is impossible to obtain fracture parameters that quantitatively characterize fractured reservoirs

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