Abstract:Seismic attributes have broaden application in hydrocarbon detection,prediction of reservoir parameters and sequence-stratigraphic interpretation,but application of seismic attributes to interpretation of depositional environment is rarely seen.The purpose of the paper is to prompt the study in this domain.Among multiple seismic attributes,the instantaneous amplitude,instantaneous frequency,instantaneous phase and coherent data volume as well as waveform clustering can be basically defined as basic seismic attributes,the other seismic attributes have direct and indirect relation with these 5 basic seismic attributes.These 5 basic attributes can reflect some depositional phenomenon:instantaneous amplitude can reflect the difference between impedance of formation (velocity and density)and porous fluid;instantaneous phase can describe the boundaries of lithologic changes and some anomalous bodies,coherent data volume can reflect the spatial changes in geologic bodies;wave-form clustering can reflect the spatial similarity of geologic bodies.In order to improve the believable level in adopting basic seismic attributes to interpret the depositional environment,use of wide-az-imuth survey is useful,adoption of relative amplitude-preserved high-resolution processing is necessary condition,how to reasonably optimize reference marker beds and calibration to calibrate the logging information are also the important guarantee of success in interpretation.The conditions seletting reference marker beds are:①the formation has similar depositional environment in research area;② the formation must be in same depositional cycle as the targets,or in same period of seismic wave.The study showed that using above-men-boned method to detect seismic attributes can result in such depositional environment information that the seismic resolution can be less than 1/4 wavelength,that means,the method can be used for interpretation and prediction of depositional microfacies,providing important information for looking for prospective reservoir.
凌云研究组. 基本地震属性在沉积环境解释中的应用研究[J]. 石油地球物理勘探, 2003, 38(6): 642-653.
Ling Yun. Study on application of basic seismic attributes to interpretation of depositional environment. OGP, 2003, 38(6): 642-653.