The Study on Sedimentation Rate of Source Rock Based onCyclostratigraphic Analysis in the Zhuyi Depression

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  • 1.Key Laboratory of Tectonics and Petroleum Resources,Ministry of Education,Faculty of Earth Resources,
    China University of Geosciences,Wuhan 430074,China;
    2.China National Offshore Oil Corporation China Ltd,Beijing 100010,China;
    3.Geophysics and Oil Resource Institute,Yangtze University,Wuhan 430100,China; 
    4.Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Wuhan 430100, China;
    5.China National Off Oil Corporation Research Institute,China National Offshore Oil Corporation,Beijing 100027,China;
    6.Petroleum Exploration and Development Research Institute of Tuha Oilfield Branch,PetroChina,Hami 839009,China.

Received date: 2013-10-20

  Revised date: 2014-03-17

  Online published: 2014-09-10

Abstract

There are three series of source rocks in the Zhuyi Depression,Pearl River Mouth Basin,including Wenchang Formation (Eocene),Enping Formation (Eocene-Oligocene)and Zhuhai Formation (Oligocene).On the basis of GR curve,the astronomical orbital periods hidden in the source rock series are recognized by spectral analysis and wavelet analysis in the Zhuyi Depression.Meanwhile,the sedimentation rates of the source rocks have been calculated by utilizing band-pass filtering.Two conclusions have been obtained: (1)Sedimentation process in the Zhuyi Depression was influenced by the astronomical orbital periods from Eocene to Oligocene.Corresponding to the astronomical orbital periods (100ka Eccentricity,40ka Obliquity,20ka Precession),there are Milankovitch Cycles of 19.8m,9.1m and 3.8m in Wenchang Formation,17.0m,6.8m and 3.4m in Enping Formation,and 9.2m,4.1m and 1.8m in Zhuhai Formation respectively.Overall,Eccentricity had the most significant impact on these three formations.(2)Sedimentation rates of source rocks are in different ranges in different sedimentary environment.The sedimentation rates of Wenchang Formation′s excellent source rocks of middle-deep lacustrine facies lie between 8.50cm/ka and 14.00cm/ka.The sedimentation rates of Enping Formation′s good source rocks of limnetic facies lie between 8.00cm/ka and 15.50cm/ka.The sedimentation rates of Zhuhai Formation′s good source rocks of neritic facies lie between 7.50cm/ka and 12.50cm/ka.
 
 

Cite this article

LI Shao-jie,HE Sheng,ZHU Wei-lin,WANG Xiao-long,WU Jing-fu,CHENG Tian . The Study on Sedimentation Rate of Source Rock Based onCyclostratigraphic Analysis in the Zhuyi Depression[J]. Natural Gas Geoscience, 2014 , 25(9) : 1328 -1340 . DOI: 10.11764/j.issn.1672-1926.2014.09.1328

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