摘要
Abstract
The fine interpretation of time-frequency domain is based on high-resolution time-frequency analysis algorithms.Reviewed the evolution of time-frequency analysis algorithms including S-Transform(ST),Generalized S-Transform(GST),Synchrosqueezing S-Transform(SST),High-order Synchrosqueezing S-Transform(HSST),Synchrosqueezing Generalized S-Transform(SGST),Multi-channel Synchrosqueezing Generalized S-Transform(MSGST),it is claimed that MSGST has high vertical and horizontal resolution.To meet the requirements of high-precision exploration and development,a High-order Multi-channel Synchrosqueezing Generalized S-Transform(HMSGST)is proposed to focus on time-frequency resolution and improves the accuracy of reservoir prediction.By comparing the calculation results of six time-frequency algorithms with theoretical signals and theoretical noise signals,it is verified that HMSGST has high time-frequency resolution and better characterization ability for complex signals,but when the signal-to-noise ratio of the signal is below 70 dB,the time-frequency noise resistance of HMSGST begins to deteriorate,and the time-frequency spectrum of the effective signal is disturbed,making it difficult to accurately characterize the time-frequency characteristics of the signal.Taking the marine sandstone in a certain 3D survey as an example,based on HMSGST,time slices are extracted along the main oil and gas reservoirs(T2 layer)in the time-frequency domain.Due to the corresponding relationship between frequency and geological information,high seismic frequency is often more advantageous to the identification of thin reservoir.Attribute analysis such as frequency attenuation gradient and frequency coherence are carried out to enhance the ability of hydrocarbon detection and recognition of short axis river channels and secondary faults.Furthermore,RGB multi-attribute fusion including the former and curvature attribute is carried out with fine carving for geological details,especially in the time slice of T2 layer based on medium-high frequency coherence.For seismic data from different survey and geological condition,parameter analysis of HMSGST is required,and suitable parameters are a prerequisite for achieving more accurate calculation results.关键词
时频分析/高阶多道同步挤压广义S变换/时频分辨率/多属性融合/储层预测Key words
time-frequency analysis/High-order Multi-channel Synchrosqueezing Generalized S-Transform(HMSGST)/time-frequency resolution/multi-attribute fusion/reservoir prediction分类
天文与地球科学
