时频分析技术划分砂砾岩沉积期次方法探讨——以渤南洼陷北部陡坡带沙四段—沙三段为例
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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。
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.
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.
引文
[1]唐向宏,李齐良.时频分析与小波变换[M].北京:科学出版社,2008.
[2]亓雪静,董立生,邵卓娜.二次型时频分析技术的开发与应用[J].油气地质与采收率,2007,14(3):67-69.
[3]苏德辰,李庆谋,罗光文,等.Fischer图解及其在旋回层序研究中的应用——以北京西山张夏组为例[J].现代地质,1995,9(3):279-283.
[4]翟永红.用Fischer图解研究山西临汾中奥陶世马家沟组旋回层序[J].岩石矿物学杂志,1999,18(2):128-133.
[5]梅冥相,马永生,周洪瑞,等.雾迷山旋回层的费希尔图解及其在定义前寒武纪三级海平面变化中的应用[J].地球学报,2001,22(5):429-436.
[6]胡受权.泌阳断陷下第三系核三上段陆相层序可容空间变化机理及其图解[J].特种油气藏,1998,5(4):1-6,26.
[7]刘惠民.牛庄洼陷沙三段上亚段—沙二段高精度层序地层学[J].油气地质与采收率,2008,15(5):49-52.
[8]王永诗,鲜本忠.车镇凹陷北部陡坡带断裂结构及其对沉积和成藏的控制[J].油气地质与采收率,2006,13(6):5-8.
[9]李霞,范宜仁,杨立伟,等.测井曲线小波变换特性在层序地层划分中的应用[J].大庆石油地质与开发,2006,25(4):112-115.
[10]徐道一.天文地质年代表与旋回地层学研究进展[J].地层学杂志,2005,29(增刊):635-640.
[11]齐永安,刘保民,崔建国.米兰柯维奇旋回及沉积作用[J].焦作工学院学报,1998,17(5):331-335.
[12]邱桂强,刘军锷,帅萍.米氏旋回基本原理及其在陆相湖盆分析中的应用前景[J].油气地质与采收率,2001,8(5):5-9.
[2]亓雪静,董立生,邵卓娜.二次型时频分析技术的开发与应用[J].油气地质与采收率,2007,14(3):67-69.
[3]苏德辰,李庆谋,罗光文,等.Fischer图解及其在旋回层序研究中的应用——以北京西山张夏组为例[J].现代地质,1995,9(3):279-283.
[4]翟永红.用Fischer图解研究山西临汾中奥陶世马家沟组旋回层序[J].岩石矿物学杂志,1999,18(2):128-133.
[5]梅冥相,马永生,周洪瑞,等.雾迷山旋回层的费希尔图解及其在定义前寒武纪三级海平面变化中的应用[J].地球学报,2001,22(5):429-436.
[6]胡受权.泌阳断陷下第三系核三上段陆相层序可容空间变化机理及其图解[J].特种油气藏,1998,5(4):1-6,26.
[7]刘惠民.牛庄洼陷沙三段上亚段—沙二段高精度层序地层学[J].油气地质与采收率,2008,15(5):49-52.
[8]王永诗,鲜本忠.车镇凹陷北部陡坡带断裂结构及其对沉积和成藏的控制[J].油气地质与采收率,2006,13(6):5-8.
[9]李霞,范宜仁,杨立伟,等.测井曲线小波变换特性在层序地层划分中的应用[J].大庆石油地质与开发,2006,25(4):112-115.
[10]徐道一.天文地质年代表与旋回地层学研究进展[J].地层学杂志,2005,29(增刊):635-640.
[11]齐永安,刘保民,崔建国.米兰柯维奇旋回及沉积作用[J].焦作工学院学报,1998,17(5):331-335.
[12]邱桂强,刘军锷,帅萍.米氏旋回基本原理及其在陆相湖盆分析中的应用前景[J].油气地质与采收率,2001,8(5):5-9.
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