【摘要】 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。更多还原

【Abstract】 Division and correlation of sedimentary period is the basis and key of exploration and development for glutinite oil accumulation. Based on the analysis of Milankovitch cycles in glutinite,it has been approved that there developed high frequency sedimentary cycles in glutinite from the fourth member to the third member of Shahejie Formation( E2s4-E3s3 ) in abrupt slope zone of Bonan Depression. Glutinite sedimentary periods were subsequently divided and correlated combined wavelet transform with Fischer-graph method. According to acoustic logging data,glutinite of upper Exs4-lower E3s3 in the interesting region has been divided into 93 high frequency sedimentary periods and the Fischer graph was drawn. Fischer graph of well Yi283 shows that the target stratum developed 8 alternation accommodation cycles. Thick bed of glutinite deposits at early and late period of each accommodation cycle,and lake-invading mudstone is clearly increased at the largest point of accommodation upward,which images a progradatinal-retrograding sedimentary cycle. Hereby,the studied stratum has been divided into 8 sedimentary periods. Based on the sedimentary period dividing for single well,isochronous correlation between different wells was achieved by restriction of seismic reflection profile.更多还原