基于小波变换的浅水三角洲高分辨率层序地层定量划分

Quantitative Division of High-resolution Sequence Stratigraphy in Shallow Water Delta Based on Wavelet Transform

针对浅水三角洲储层横、纵向变化快导致井间高精度层序地层对比困难的问题,结合测井曲线和井旁地震资料,采用基于小波变换的时频分析技术,定量识别和划分高精度层序地层界面.以渤海湾盆地垦东凸起东部斜坡带明化镇组下段为例,综合利用测井曲线连续小波变换和地震时频分析技术定量识别具有等时意义的层序界面.研究发现,利用时频分析技术能够有效地对浅水三角洲进行高分辨率层序地层的定量划分和识别,研究区目的层明化镇组下段共发育4个体系域、7个准层序组和17个准层序级别的层序地层单元,搭建了具有等时意义的高精度层序地层格架.

To solve the difficult problem of high resolution sequence stratigraphy in shallow water delta sedimentary reservoirs rapid vertical and horizontal changes that induce where the contrast of high-precision sequence stratigraphy is difficult in interwells,combined with logging curves and nearwell seismic data,this paper uses time-frequency analysis technique based on wavelet transform to quantitatively identify and classify high resolution sequence stratigraphic interfaces.By taking the lower section of Minghuazhen Formation in the eastern slope of Kendong Protruding of Bohaiwan Basin as an example,the sequence interface with equal time is quantitatively identified by comprehensive utilization of the logging curve continuous wavelet transform and the seismic time-frequency analysis technology.The results show that the time-frequency analysis technique can effectively classify and identify the high resolution sequence stratigraphy in shallow water delta.There are 4 systems tract,7 parasequence groups and 17 parasequence units in the lower section of Minghuazhen Formation.A high-precision sequence stratigraphic framework with equal time is set up.