D-S证据理论在地震属性中的应用

THE APPLICATION OF D-S EVIDENCE THEORY IN SEISMIC ATTRIBUTE ANALYSIS

在利用复地震道分析技术提取出地震信号局部变化的三瞬属性(瞬时振幅;瞬时相位和瞬时频率)的基础上,采用D—S改进算法对三瞬属性进行多传感器的证据融合,得到三种属性所占的权重,并根据相应权重,经过数据融合可以得到最终融合结果。这样有效融合了三种地震属性中有利于进行地震薄互层分析的地震信息,与单一的复地震道分析相比,更能有效地反映出地震信号的局部变化。最后通过对实际的地震资料进行了处理,发现D—S信息融合技术体现的地震波属性的变化,比单一属性更能清楚地反映出地质体的地质现象及表达的沉积过程。

Evidence theory is widely used in data fusion systems.However,it is never used in seismic at- tributes analysis.A new application of D-S evidence theory in seismic attribute is presented. The process of the D-S information fusion method contains the following steps;firstly,using the complex seismic trace analysis to extract three instantaneous attributes(instantaneous amplitude, instantaneous phase and instantaneous frequency); then,utilizing the modified D-S algorithm on the combination of three instantaneous attributes and getting the final result of the data fusion system; finally,effectively combination of the useful information of the three seismic attributes which reflects more clear local changes of seismic signals than single attribute.The actual example shows D-S information fusion method brings better reflections on changes of seismic properties,geological phenomenon and geological deposition.