Method of using absorption and attenuation characteristics of seismic wave for reservoir analysis

Abstract

The invention provides a method of using absorption and attenuation characteristics of seismic waves for reservoir analysis, belonging to the field of seismic exploration and development of oil gas and coal bed gas. Based on the theory of absorption and attenuation of seismic waves and the technology of seismic spectral decomposition, seismic forward modeling techniques are adopted for different types of thin reservoirs, the amplitude is corrected via analyzing the relationship between the reservoir thickness and the seismic amplitude and frequency, and then the reservoir evaluation and analysis based on the stratum unit are performed under constraints of geologic horizons according to the properties of seismic absorption and attenuation. The purpose of evaluating the gas content of the reservoir according to the properties of absorption and attenuation of seismic waves is realized, and the method has broad application values in the evaluation and description of heterogeneous reservoirs, in particular the evaluation and fine description of coal bed gas and other unconventional reservoirs.

Description

technical field [0001] The invention belongs to the field of seismic exploration and development of oil and gas and coalbed methane, and in particular relates to a reservoir analysis method using seismic wave absorption and attenuation characteristics. Background technique [0002] With the continuous deepening of oil and gas exploration and development, the focus of conventional oil and gas exploration has shifted from the original structural oil and gas reservoirs to lithologic oil and gas reservoirs and subtle oil and gas reservoirs. Pay attention to. In the study of reservoir heterogeneity and gas-bearing property, formation absorption parameters are considered to be one of the most sensitive and reliable basis for analyzing reservoir heterogeneity and gas-bearing property. According to well logging data or related seismic data in the well, the absorption and attenuation characteristics of the reservoir can be analyzed more accurately. However, for oil and gas explorati...

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Problems solved by technology

[0007] The technical research on the analysis of formation absorption and attenuation using seismic data is one of the hotspots in seismic research. The estimation of formation absorption and attenuation has two main purposes. One is to improve the quality and accuracy of seismic imaging in the seismic processing stage, and the other is to In the stages of seismic interpretation and reservoir prediction, improve the accuracy of heterogeneous reservoir description, perform hydrocarbon detection and gas-bearing evaluation of reservoirs. The basis of these methods and technologies is the theory of seismic wave absorption and attenuation. The technology involved in the patent of this invention The content is mainly to use the seismic absorption and attenuation characteristics to describe the reservoir and predict the gas-bearing property of the unconventional reservoir. Due to many influencing factors, the obtained interpretation results have certain multi-solutions, and it is difficult to be consistent with the lithological characteristics and gas-bearing properties of the actual reservoir.

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