Oil and gas prediction method and oil and gas prediction device

Abstract

Embodiments of the invention disclose an oil and gas prediction method and an oil and gas prediction device. The method comprises the following steps: quantitatively predicting the fracture development direction and fracture density in a formation to be detected in a target area based on acquired drilling data and logging data; determining the minimum preset threshold of the ratio of the amplitude value of seismic wave in the formation to be detected to the amplitude value of seismic wave in the bedrock according to the fracture development direction, the fracture density and the drilling data and logging data, establishing a corresponding predominant direction data extraction solution, and extracting gather data in a preset range from an acquired seismic five-dimension gather data body; and making AVO analysis or AVA analysis of the extracted gather data to predict the oil-gas possibility of the formation to be detected. By adopting the technical scheme disclosed by the embodiments of the invention, the prediction accuracy of oil-gas possibility in a carbonate rock karst-fissure-cavity reservoir can be improved.

Description

technical field [0001] The present application relates to the technical field of oil exploration, in particular to an oil and gas prediction method and device. Background technique [0002] Carbonate reservoirs contain more than 60% of the world's oil and gas reserves, so it is of great significance to study the prediction methods of carbonate reservoirs. [0003] At present, the commonly used oil and gas prediction methods mainly have two aspects: one is the post-stack oil and gas prediction method. The attenuation degree of the signal can be used to indirectly predict the oil and gas bearing property of the reservoir. This method is mainly applicable to areas where oil and gas reservoirs are dominated by gas reservoirs. The second is the pre-stack oil and gas prediction method, which mainly uses the characteristics of the attenuation difference between the longitudinal wave and the shear wave when the seismic wave passes through the oil and gas layer, and combines the ph...

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Problems solved by technology

[0005] In the prior art, when the pre-stack oil and gas prediction method is used to predict the oil and gas in the exploration area, the influence of the fracture anisotropy of the reservoir on the oil and gas prediction results is not considered, and the pore structure of the carbonate reservoir is complex, heterogeneous Due to the strong quality, the fracture anisotropy of the reservoir has a great influence on the oil and gas prediction effect, so the above method cannot accurately predict the oil and gas distribution characteristics in the carbonate reservoir

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