Method for identifying weak reflection reservoir

Abstract

The present invention relates to a method for identifying a weak reflection reservoir. Firstly, according to a formation lithology structural characteristic, the geological factors of seismic weak reflection lithology oil reservoir formation is determined through forward modeling, then seismic data is subjected to frequency extraction and filtering process so as to improve the identification ability of a weak reflection small size target by earthquake, then the seismic facies analysis is carried out, a seismic weak reflection development zone is determined, seismic attribute analysis is carried out, the distribution characteristics of the weak reflection reservoir is finely described, and the weak reflection reservoir is identified through the seismic weak reflection development zone and the reservoir distribution characteristics obtained according to the seismic facies and the seismic attribute. The identification and hydrocarbon potential detection are carried out through wavelet decomposition and reconstruction, the precision of reservoir prediction and trap identification are improved, and the purpose of improving the success rate of drilling is achieved. According to the method, the precision of weak reflection geological target identification and fine description are effectively raised, the method is systematic, effective, economical and practical, and the method is widely applied to the oil and gas exploration under the same geological conditions and has good social and economic values.

Description

technical field [0001] The invention relates to a method for identifying weak reflection reservoirs, belonging to the technical field of petroleum exploration and development. Background technique [0002] With the increasing degree of oil and gas exploration in China's continental basins, the status and role of lithologic oil and gas reservoirs are becoming more and more important. The exploration targets are mainly small sand bodies, narrow channels, and thin interbeds. , Thin thickness, fast phase change, and seismic reflection response characteristics often show weak reflection structure, which makes reservoir identification and prediction difficult, and seriously restricts the process of oil and gas exploration and development. [0003] In recent years, aiming at the frontier subject of application research of weak reflection reservoir description technology based on seismic data, in-depth discussions and beneficial attempts have been made on the formation mechanism and...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for identifying weakly reflecting reservoirs, to solve the problem of difficult identification of reservoirs whose seismic reflection response characteristics are weakly reflecting structures

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