基于米兰科维奇周期的沉积速率计算新方法——以东营凹陷牛38井沙三中为例
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摘要
选择东营凹陷牛38井沙三中地层作为目的层段,对与气候变化紧密相关的自然伽马数据进行频谱分析和连续小波变换,结果显示沙三中地层受对应于旋回厚度12.127 m的短偏心率125 ka周期显著控制。对该周期滤波分析发现,沙三中地层中保存了约40个125 ka周期;并在沙三中底部绝对年龄38.975 Ma的控制下,建立了牛38井沙三中高分辨率天文年代标尺,确定沙三中顶部年龄为33.975 Ma。在区域地层格架的基础上,根据地震、岩心、测井等资料将沙三中东营三角洲精细划分为9期进积体Z1-Z9。对各期进积体进行滑动窗口频谱分析,结果表明沙三中沉积速率随时间先增大后减小,进积体Z4沉积速率达到最大值0.127 m/ka,是三角洲进积最为鼎盛的时期。最后依据沉积速率计算出各期进积体持续时间,推算出了Z1-Z9各界面较为准确的地质年龄。
A case study was carried out in the middle section of the 3rd member of the Shahejie Formation in well Niu38,Dongying Sag,Bohai Bay Basin.Spectrum analysis and continuous wavelet spectrum of GR log which was closely related to climate change indicated that the target interval was significantly controlled by the eccentricity period of 125 ka corresponding to the thickness of 12.127 m.The filter analysis of this period revealed that about 40 cycles of 125 ka were preserved in the target interval.High-resolution astronomical time scale was established,by means of which the age of the top of the target interval was 33.975 Ma since that of the bottom of the target interval was 38.975 Ma.Based on regional stratigraphic framework,combined with seismic,core and logging data,the Dongying delta was divided into 9 periods named Z1-Z9.According to the sliding window spectrum analysis,the sedimentary rates of the target interval first increased and then decreased as time went by.The sedimentary rate of Z4 reached the maximum(0.127 m/ka) during the most prosperous period of delta prograding.Finally,the duration of each period and more accurate geological age of the interfaces were calculated on the basis of sedimentary rates.
A case study was carried out in the middle section of the 3rd member of the Shahejie Formation in well Niu38,Dongying Sag,Bohai Bay Basin.Spectrum analysis and continuous wavelet spectrum of GR log which was closely related to climate change indicated that the target interval was significantly controlled by the eccentricity period of 125 ka corresponding to the thickness of 12.127 m.The filter analysis of this period revealed that about 40 cycles of 125 ka were preserved in the target interval.High-resolution astronomical time scale was established,by means of which the age of the top of the target interval was 33.975 Ma since that of the bottom of the target interval was 38.975 Ma.Based on regional stratigraphic framework,combined with seismic,core and logging data,the Dongying delta was divided into 9 periods named Z1-Z9.According to the sliding window spectrum analysis,the sedimentary rates of the target interval first increased and then decreased as time went by.The sedimentary rate of Z4 reached the maximum(0.127 m/ka) during the most prosperous period of delta prograding.Finally,the duration of each period and more accurate geological age of the interfaces were calculated on the basis of sedimentary rates.
引文
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[4]姚益民,徐道一.东营凹陷牛38井沙三段高分辨率旋回地层研究[J].地层学杂志,2007,31(3):229-239.
[5]林会喜,鄢继华.渤海湾盆地东营凹陷古近系沙河街组三段沉积相类型及平面分布特征[J].石油实验地质,2005,27(1):55-61.
[6]Abels H A,Aziz H A,Krijgsman W,et al.Long-period eccentricity control on sedimentary sequences in the continental Madrid Basin(middle Miocene,Spain)[J].Earth and Planetary Science Let-ters,2010,289:220-231.
[7]Wonik Thomas.Gamma-Ray measurement in the KirchrodeⅠandⅡboreholes[J].Palaeogeography,Palaeoclimatolo-gy,Palaeoecology,2001,174:97-105.
[8]测井软件项目组.Forward工程技术手册[M].北京:石油工业出版社,1999.
[9]Schulz M,Mudelsee M.REDFIT:estimatingred-noise spectra directly from unevenly spaced paleoclimatic time series[J].Computers&Geosciences,2002,28:421-426.
[10]Torrence C,Compo G P.A practical guide to wavelet analysis[J].Bulletin of the American Meteorological Society,1998,79(1):61-78.
[11]Sen A K,Filippelli G M,José-Abel F.An application of wavelet a-nalysis to paleoproductivity records from the Southern Ocean[J].Computers&Geosciences,2009,35:1445-1450.
[12]Laskar J,Robutel P,Joutel F,et al.A long-term numericalsolu-tion for the insolation quantities of the Earth[J].Astronomy and Astrophysics,2004,428:261-285.
[13]Hinnov L A,Ogg J G.Cyclostratigraphy and the astronomical time scale[J].Stratigraphy,2007,4:239-251.
[14]Lirer F,Harzhauser M,Pelosi N,et al.Astronomically forced teleconnection between Paratethyan and Mediterranean sedi-ments during the Middle and Late Miocene[J].Palaeogeogra-phy,Palaeoclimatology,Palaeoecology,2009,275:1-13.
[15]田军,汪品先,成鑫荣,等.南海ODP1143站上新世至更新世天文年代标尺的建立[J].地球科学——中国地质大学学报,2005,30(1):31-39.
[16]张善文,张林晔.东营凹陷古近系异常高压的形成与岩性油藏的含油性研究[J].科学通报,2009,54(11):1570-1578.
[17]Gorgas T J,Wilkens R H.Sedimentation rates off SW Africa since the late Miocene deciphered from spectral analyses of borehole and GRA bulk density profiles:ODP Sites1081-1084[J].Marine geology,2002,180:29-47.
[18]吴怀春,张世红,黄清华.中国东北松辽盆地晚白垩世青山口组浮动天文年代标尺的建立[J].地学前缘,2008,15(4):159-169.
[19]王居峰.济阳坳陷东营凹陷古近系沙河街组沉积相[J].古地理学报,2005,7(1):45-58.
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