Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (6): 1642-1653.doi: 10.13278/j.cnki.jjuese.201706104

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Blended Mouth Bars' Cause and Sedimentary Significance of Middle-Deep Beds in Western Slope of Nanpu Sag, Bohai Bay Basin

Xia Jingsheng1, Wang Zhikun1, Wang Hairong2, Xue Lin1, Wang Kai3, Liu Chengquan4   

  1. 1. Research Institute of Petroleum Exploration & Development, Jidong Oilfield Company of Petrochina, Tangshan 063004, Hebei, China;
    2. School of Energy Resources, China University of Geosciences, Beijing 100083, China;
    3. Bureau of Geophysical Prospecting INC, China National Petroleum Corporation, Zhuozhou 072750, Hebei, China;
    4. Geophysical Prospecting Research Institute, Jilin Oilfield Company, PetroChina, Songyuan 138000, Jilin, China
  • Received:2017-03-04 Online:2017-11-26 Published:2017-11-26
  • Supported by:
    Supported by National Science and Technology Major Project (2011ZX05006-006) and Science and Technology Major Project of PetroChina Company Limited (2014E-050211)

Abstract: A unique type of blended mouth bars was recognized in middle-deep fan deltas in the western slope of Nanpu Sag, Bohai Bay basin. Combined with logging and seismic facies, and blended mouth bars' sedimentary features, the authors investigated bars' form, distribution patterns, and the genetic mechanisms by systematic view and analysis of cores from middle-deep beds of the research area. The results indicate that the lithology combination of the blended mouth bar shows an overall vertical upward sedimentary sequence consisting of multiple small reverse and positive compound cycles, the features of deposition from gravity flow. In a plane view, these blended mouth bars develop usually in front of underwater distributary channels of fan delta, and they present usually the forms of ligule or leaf. On the section, these blended mouth bars mainly show banded form, lute-shaped form, reversed lute-shaped form, and spindle-shaped form along depositional dip. These bars are independent lentoid sand body on perpendicular to source direction. These special blended mouth bars are quite different from the normal mouth bars on the basis of their characteristics, so they are called blended gravity flow bars.

Key words: fan delta, sandy debris flow, hyperpycnal flows, blended gravity flow bar, western slope of Nanpu Sag

CLC Number: 

  • TE111.3
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