Method for identifying fluid saturation of carbonate reservoir based on poststack seismic data

Abstract

The invention discloses a method for identifying the fluid saturation of the carbonate reservoir based on poststack seismic data. The method comprises following steps: step one, carrying out ultrasonic experimental testing of carbonate reservoir rocks and calculation of rock sample attenuation; step two, carrying out seismic attenuation extraction of the carbonate reservoir; step three, constructing a carbonatite attenuation rock attenuation physical model; step four, analyzing influences on the dispersion and attenuation by anisotropy and fluid distribution heterogeneity of the carbonatite structure; step five, constructing a carbonatite attenuation rock physical map plate; step six, correcting the attenuation rock physical map plate under the ultrasonic and seismic frequency bands; and step seven, carrying out quantitative interpretation of the carbonate reservoir porosity and fluid saturation. During the ultrasonic experimental testing, ultrasonic waveform measurement under the partially saturated condition is carried out on the carbonate reservoir sample and the gas is nitrogen. According to the invention, influences on the elastic wave dispersion and attenuation by the anisotropy of the pore structure and the uneven distribution of the partially saturated fluid in the complex rock can be described based on the dual-dual pore structure model.

Description

technical field [0001] The invention relates to a method for identifying the fluid saturation of carbonate rock reservoirs based on post-stack seismic data. The high sensitivity of seismic wave attenuation to reservoir fluids is used to construct carbonate rock attenuation petrophysical charts to detect reservoir fluids. The field of seismic fluid detection in unconventional oil and gas reservoirs. Background technique [0002] As a kind of unconventional oil and gas resources, carbonate oil and gas reservoirs are widely distributed, rich in reserves, and have great exploration potential. In recent years, the exploration and development of carbonate reservoirs has taken an increasing proportion in the development of global oil and gas resources. There are many types of carbonate reservoir spaces with strong heterogeneity. In addition to pores and throats, there are also cracks and caves in the voids in the reservoir. The open fractures or caves improve the physical charact...

AI Technical Summary

Problems solved by technology

[0025] The purpose of the present invention is to overcome the deficiency that the existing methods for identifying the fluid saturation of carbonate rock reservoirs are easily restricted by the high cost of pre-stack data, and provide a method for identifying fluid saturation of carbonate rock reservoirs based on post-stack seismic data. Degree method, the technical scheme is as follows:

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