应用测井资料的三瞬属性进行地层划分及对比研究

地层划分及对比是油气田勘探开发一项重要且存在难题的工作,提出应用 Hilbert-Huang变换方法提取常规测井资料(自然伽马、声波时差等)的三瞬属性特征进行地层划分及对比,即瞬时频率、瞬时振幅、瞬时相位3个属性,揭示了测井数据各深度处的频率特性,可以清晰反映出频率变化的结构特征.依据不同属性的振荡异常刻度层序边界,不同频率成分的属性振荡周期变化特征刻度不同规模的层序旋回周期特征,进而利用三瞬属性信息进行地层对比,刻画地层内部特征.利用这些属性异常可以清晰地找到对应地层序列中不同级别的界面,进而实现对各级层序划分,在各级层序格架控制下,进行各级地层等时对比.提取测井资料的三瞬属性为高分辨率层序地层研究提供了一种新的方法思路,为推动高分辨率层序地层学的发展具有重要意义.

The Application of Three Instantaneous Attribute Features from Logging Data for the Research of Stratigraphic Division and Correlation

The stratigraphic division and correlation is an important and also diffcuh work for exploration and development of oil and gas fields.We present the application of Hilbert-Huang Transform to extract thethree in-stantaneousattribute features from logging data (natural gamma,acoustic time)to do the stratigraphie division and correlation.The three attributes areinstantaneous frequency.instantaneous amplitude'andinstantaneous phase,which reveal the frequency characteristics of each depth of logging data and clearly reflect the structural characteristics of the frequency change.According to the oscillation anomalies of different attributes,we scaled se-quence boundaries,and used the variation characteristics of oscillation period of different frequency components at-tributes to scale the periodic characteristics of different scale sequence cycle.then used thethree instantaneousattribute information for stratigraphie correlation.and for describing the intemal features of formation.These attrib-utes anomalies can be used to clearly find the different class interface of stratigraphie sequence,to achieve the se-quenee division at all levels,and under the control of sequence framework at all levels,we can do the isochronous stratigraphic correlation at all levels.Thethree instantaneousattribute extraction of logging data provides a new approach and idea for high resolution sequence stratigraphy analysis,and it has important significance for promoting the development of high-resolution sequence stratigraphy.