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基于米氏旋回分析,证实了渤南洼陷北部陡坡带沙四段—沙三段砂砾岩发育高频沉积旋回;将小波变换时频分析技术与Fischer图解法相结合,对研究区砂砾岩进行了沉积期次划分和对比。基于声波测井资料,采用db4小波,通过小波变换将渤南洼陷北部陡坡带沙四段上亚段—沙三段下亚段砂砾岩划分出93个高频沉积旋回,并在此基础上编制了Fischer图解。Fischer图解显示出研究层段发育了8个可容空间变化旋回,每个旋回的可容空间上升初期和下降末期对应了厚层砂砾岩沉积,可容空间最大处湖侵泥岩明显增多,反映了一个完整的砂砾岩进积—退积沉积旋回。据此,将研究层段砂砾岩划分为8个沉积期次。在单井沉积期次划分的基础上,通过地震约束的可容空间变化旋回对比,实现了连井沉积期次等时对比。
Based on the Mieser cycle analysis, it was confirmed that the high-frequency sedimentary cycles of sand-gravel rocks in the third and fourth member of Shahejie Formation in the northern steep slope belt of Bonan Sag were confirmed. Combining the wavelet transform time-frequency analysis technique and Fischer diagram method, Deposition and contrast deposition. Based on the acoustic logging data, 93 high-frequency sedimentary cycles are divided by the db4 wavelet by using wavelet transform to transform the glutenite in the lower sub-section of the upper member of Es4-Sha4 in the northern steep slope belt of Bonan Sag. Based on this, Fischer diagram prepared. The Fischer diagram shows that there are 8 space-changing cycles developed in the study interval. The thick space of conglomerate deposition at the beginning and the end of each cycle increases the volume of sedimentary rocks at the maximum, which reflects that A complete glutenite pluvial-deposi- tional sedimentary cycle. According to this, the study interval gravel rocks are divided into eight sedimentary periods. Based on the single-well sedimentary period division, the contrast of the space-constrained space can be changed and the isochronous sedimentary period can be compared.