地震属性的优化处理及储层厚度的定量解释

OPTIMIZED PROCESSING OF SEISMIC ATTRIBUTES AND QUANTITATIVE INTERPRETATION OF RESERVOIR THICKNESS

依据三维地震数据的评估、解释及三维地震数据体的地震属性提取,简要论述了地震属性参数的标准化处理、因子分析及主成分分析等优化处理方法.认为地震属性的提取要根据研究目的而确定;地震属性相互之间存在程度不等的相关性;振幅、能量半时、瞬时频率、频带宽等属性与砂岩厚度的相关性较好;在解释厚度小于1/4波长(调谐厚度)时,薄互层反射波振幅与地层厚度近似成正比,可利用地震响应的差异,按调谐原理来估算地层的厚度.

Based on evaluation of 3D seismic data, seismic interpretation and abstraction of seismic attributions, the method of optimized processing of seismic attributes is briefly introduced. It mainly includes standardization of seismic attributes, correlative analysis, and analysis of factors and main components. It is regarded that abstraction of seismic attributes is dependant on research purposes. The seismic attributes are correlative to each other. A good correlation is present between sandstone抯 thickness and attributes of amplitude, energy half time and instantaneous frequency. In case of frequency tuning thickness less than a quarter wave in length, reflection wave amplitude of thin interbeds is proportional to stratum thickness. Therefore, it could be estimated according to tuning theory by utilizing discrepancy of seismic response.