Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (3): 378-383.doi: 10.11743/ogg20060313

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Features of condensed section and its relationship with source rocks: taking marine Sinian-Middle Triassic in southern China as examples

Tian Jingchun, Chen Hongde, Zhang Xiang, Nie Yongsheng, Xia Qingsong, Zhao Qiang   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu, Sichuan 610059
  • Received:2006-04-27 Online:2006-06-25 Published:2012-01-16

Abstract:

In sequence stratigraphy,boundaries that can be used to define sequences include bottom boundaries,initial marine flooding surface and maximum flooding surface,of which the sediments corresponding to the maximum flooding surface constitute the condensed section.Identification of condensed section is not only the key to understanding of sequence structure,but also critical to analysis of global relative sea level changes during geologic history.Taking the marine Sinian-Middle Triassic in southern China as examples,6 rock formations are recognized in condensed section,including silicalite,black shale,argillaceous rock,biogenic fossil bed,micrite and nodular limestone.Although different types of condensed sections have been deposited in different sedimentary environments,they all have been deposited when the global relative sea level reached the highest position.Their formation time,therefore,corresponds to the optimum development stage of source rocks in southern China.

Key words: condensed section, feature, source rock, Sinian-Middle Triassic, South China

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