摘要
重点阐述了基于地震属性的地震相分析方法。了解区域地质概况、沉积背景,选取完整的沉积体系;选取合适的时窗沿层提取地震属性(RMS,平均瞬时频率、有效带宽),利用RMS属性识别沉积体,平均瞬时频率判断物源方向,有效带宽推测沉积环境及地层的均质性;综合考虑最终确定沉积体的地震相特征,绘制该层段的地震相平面图;最后将地震相转相为沉积相。利用该方法对尼日尔三角洲S工区进行地震相分析,识别出高弯度水道、水道-朵叶复合体、末端朵叶等沉积体的典型地震相特征,取得很好的效果,显示该方法具有良好的应用前景。
In this paper,the seismic facies analysis method based on seismic attributes is mainly described.Firstly,the regional geological survey and sedimentary background are given.Then the method is introduced as this： the complete sedimentary system is selected and the seismic attributes（RMS,Average Instantaneous Frequency,Effective Bandwidth,etc）are extracted from the appropriate time-window along an event;the attribute of RMS amplitude is used to identify the sedimentary bodies;average instantaneous frequency is used to identify the sources direction;the effective bandwidth is used to predicate sedimentary environment condition and stratigraphic characteristics.So through the comprehensive considerations,the seismic facies feature of the sedimentary body is determined.The seismic facies plan is drawn.Finally,seismic facies are transformed into sedimentary facies.This method has been applied to analyzing seismic facies in S area of the Niger Delta.The typical characteristics of seismic facies of high-sinuosity channels,channel-lobes complex,terminal lobes and other sedimentary bodies are identified.The method achieved good results.
出处
《工程地球物理学报》
2010年第6期694-698,共5页
Chinese Journal of Engineering Geophysics
关键词
地震相
均方根属性
平均瞬时频率
有效带宽
高弯度水道
seismic facies
RMS amplitude
the average instantaneous frequency
effective bandwidth
high-sinuosity channel
