辽河西部凹陷欢喜岭地区沙河街组层序界面的识别
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摘要
对辽河西部凹陷欢喜岭地区层序地层的研究,总结出4种层序界面的识别方法:①钻井、测井资料;②泥砂比曲线;③小波变换;④地震时频分析。方法①表现为在沙河街组各三级层序界面处,岩性、相序、曲线形态和幅值有不同程度的突变;方法②表现为在一个完整的三级层序中,泥砂比曲线由小变大再变小,其中泥砂比值最大处为最大湖泛面(MFS)位置;方法③表现为在一个完整的三级层序中,谱系图从低频到高频再到低频的变化,在系数曲线上表现为一个或近似一个完整的振荡旋回,其中谱系图中高频部分对应着最大湖泛面位置;方法④在剖面上层序界面处为低频部分,高频部分是最大湖泛面位置。通过测井与地震信息相结合,综合运用4种方法识别出7个层序界面和6个最大湖泛面,由此建立了研究区的高精度层序地层格架。
By research on the sequence strata in Huanxiling area in western Liaohe depression,the authors introduced four methods for identifying sequence boundary,including ①data of well drilling and logging,②mudstone/sand ratio curve,③wavelet transformation,and ④seismic time-frequency analysis. The first method appears varying abrupt change of lithology,facies sequence,curve type and amplitude in every third-order sequence interface of Shahejie Formation. The second method appears that mudstone/sand ratio curve changes from narrow to wide,then to narrow,and the position of maximum amplitude is MFS in one complete third-order sequence. The third method appears that the frequency spectrum changes from low frequency to high frequency,then to low frequency and shows one or approximate one vibration cycle in coefficient curve,and the position of high frequency is MFS in one complete third-order sequence. The fourth method appears that the position of low frequency is sequence boundary and the position of high frequency is MFS. Combining with logging and seismic information,the authors applied the four methods to identify seven sequence boundaries and six MFS,then built the high precision sequence stratigraphy framework.
By research on the sequence strata in Huanxiling area in western Liaohe depression,the authors introduced four methods for identifying sequence boundary,including ①data of well drilling and logging,②mudstone/sand ratio curve,③wavelet transformation,and ④seismic time-frequency analysis. The first method appears varying abrupt change of lithology,facies sequence,curve type and amplitude in every third-order sequence interface of Shahejie Formation. The second method appears that mudstone/sand ratio curve changes from narrow to wide,then to narrow,and the position of maximum amplitude is MFS in one complete third-order sequence. The third method appears that the frequency spectrum changes from low frequency to high frequency,then to low frequency and shows one or approximate one vibration cycle in coefficient curve,and the position of high frequency is MFS in one complete third-order sequence. The fourth method appears that the position of low frequency is sequence boundary and the position of high frequency is MFS. Combining with logging and seismic information,the authors applied the four methods to identify seven sequence boundaries and six MFS,then built the high precision sequence stratigraphy framework.
引文
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[12]刘金华,袁波.辽河西部凹陷欢喜岭地区沙河街组三段构造坡折带特征[J].世界地质,2009,28(3):284-290.LIU Jin-hua,YUAN Bo.Characteristics of structural slope-break zone in the3th submember of Shahejie For-mation of western Liaohe[J].Global Geolgy,2009,28(3):284-290.
[2]杨磊,刘池洋,张小莉.利用测井曲线自动划分层序地层的方法研究[J].西北大学学报:自然科学版,2007,37(1):111-114.YANG Lei,LIU Chi-yang,ZHANG Xiao-li.A study on the method for the division of sequence stratigraphy auto-matically using well logs[J].Journal of Northwest Uni-versity:Natural Science Edition,2007,37(1):111-114.
[3]房文静,范宜仁,邓少贵,等.高斯小波用于测井层序地层自动划分的研究[J].中国石油大学学报:自然科学版,2007,31(2):55-58.FANG Wen-jing,FAN Yi-ren,DENG Shao-gui,et al.Application of Gauss wavelet to demarcate log stratigraph-ic sequence automatically[J].Journal of China Univer-sity of Petroleum:Natural Science Edition,2007,31(2):55-58.
[4]史清江,王延江,孙正义,等.小波变换和沃尔什变换在测井曲线分层中的联合应用[J].中国石油大学学报:自然科学版,2006,30(2):138-142.SHI Qing-jiang,WANG Yan-jiang,SUN Zheng-yi,et al.Joint application of wavelet transform and Walsh transform for automatic segmentation of well logs[J].Journal of China University of Petroleum:Natural Science Edition,2006,30(2):138-142.
[5]吴国忱,康仁华,印兴耀.三维时频分析方法在地震层序分析中的应用[J].中国石油大学学报:自然科学版,2000,24(1):81-86.WU Guo-chen,KANG Ren-hua,YIN Xing-yao.Appli-cation of3D time-frequency analysis method to seismic sequence analysis[J].Journal of China University of Petroleum:Natural Science Edition,2000,24(1):81-86.
[6]吴义杰,高德群,许江桥,等.一种自动识别高分辨率层序地层的方法及计算机实现[J].石油地球物理勘探,2003,38(2):162-167.WU Yi-jie,GAO De-qun,XU Jiang-qiao,et al.A method for automatic recognition of high-resolution se-quence-stratigraphy and its realization on computer[J].Geophysical Prospecting for Petroleum,2003,38(2):162-167.
[7]Angeleri G P.A statistical approach to extraction of seis-mic propagating wavelet[J].Geophysical Prospecting,1983,31(5):726-747.
[8]Lanning E N,Johnson D M.Automated identification of rock boundaries:an application of the walsh transform to geophysics well-log analysis[J].Geophysics,1983,48(2):197-205.
[9]余继峰,李增学.测井数据小波变换及其地质意义[J].中国矿业大学学报,2003,32(3):336-339.YU Ji-feng,LI Zeng-xue.Wavelet transform of logging data and its geological significance[J].Journal of China University of Mining&Technology,2003,32(3):336-339.
[10]操应长,姜在兴,夏斌,等.利用测井资料识别层序地层界面的几种方法[J].中国石油大学学报:自然科学版,2003,27(2):23-28.CAO Ying-chang,JIANG Zai-xing,XIA Bin,et al.Some methods for identifying sequence boundaries and condensation sections using well logging[J].Journal of China University of Petroleum:Natural Science Edition,2003,27(2):23-28.
[11]国景星,刘媛.济阳坳陷新近系层序地层构型[J].中国石油大学学报:自然科学版,2008,32(1):1-5.GUO Jing-xing,LIU Yuan.Model of sequence stratum of Neogene of Jiyang depression[J].Journal of China University of Petroleum:Natural Science Edition,2008,32(1):1-5.
[12]刘金华,袁波.辽河西部凹陷欢喜岭地区沙河街组三段构造坡折带特征[J].世界地质,2009,28(3):284-290.LIU Jin-hua,YUAN Bo.Characteristics of structural slope-break zone in the3th submember of Shahejie For-mation of western Liaohe[J].Global Geolgy,2009,28(3):284-290.
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