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Volume 23 Issue 4
Aug 2012
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Article Contents
Journal of Earth Science  > 2012  >  23(4): 542-558.
Hui Rong, Yangquan Jiao, Liqun Wu, Yuan Gu, Liya Zhang, Rong Li, Fanping Zeng. Effects of Diagenesis on the Acoustic Velocity of the Triassic Oolitic Shoals in the Yudongzi Outcrop of Erlangmiao Area, Northwest Sichuan Basin. Journal of Earth Science, 2012, 23(4): 542-558. doi: 10.1007/s12583-012-0274-1
Citation: Hui Rong, Yangquan Jiao, Liqun Wu, Yuan Gu, Liya Zhang, Rong Li, Fanping Zeng. Effects of Diagenesis on the Acoustic Velocity of the Triassic Oolitic Shoals in the Yudongzi Outcrop of Erlangmiao Area, Northwest Sichuan Basin. Journal of Earth Science, 2012, 23(4): 542-558. doi: 10.1007/s12583-012-0274-1
shu

Effects of Diagenesis on the Acoustic Velocity of the Triassic Oolitic Shoals in the Yudongzi Outcrop of Erlangmiao Area, Northwest Sichuan Basin

doi: 10.1007/s12583-012-0274-1
  • 1.

    Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China

  • 2.

    Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

  • 3.

    Faculty of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China

  • 4.

    Department of Earth and Atmospheric Sciences, University of Alberta, Alberta T6G1H7, Canada

  • 5.

    BGP Dagang Branch, BGP Inc., China National Petroleum Corporation, Tianjin 300280, China

Funds:

the SINOPEC Forward Looking Project of China YPH08114

More Information
  • Corresponding author: Liqun Wu, 176781317@qq.com
  • Received Date: 10 Feb 2012
  • Accepted Date: 08 May 2012
  • Publish Date: 01 Aug 2012
    Abstract
  • The oolitic shoals of the Triassic carbonate platform margin in the Yudongzi (鱼洞子) outcrop of Erlangmiao (二郎庙) area in the northwestern Sichuan (四川) basin present a scarce opportunity to quantitatively describe their diagenesis and its effects on the acoustic velocity. Using a detailed field geologic survey,profiles illustration of typical depositional system,and systematic testing,five types of diagenesis have been identified in the oolitic shoals: micritization,cementation,compaction and pressolution,dissolution,and dolomitisation. The cementation is composed of four subtypes (micrite cements,fibrous calcite cements,granular calcite cements,and blocky calcite cements). The dissolution is formed from three subtypes (freshwater selective dissolution,burial non-selective dissolution,and burial selective dissolution). The dolomitisation is composed of three subtypes (fine-crystalline dolomites,microcrystalline dolomites,and medium-crystalline dolomites). In order to quantitatively describe the diagenetic fabric of oolitic shoals,the micritic grain content,calcite cement content,mean pore diameter,pore types,dolomite content,and dolomite types have been evaluated. Based on these data,the relationship between the acoustic velocity and diagenesis of oolitic shoals has been established. The results show that the diagenetic fabric is linearly related with the acoustic velocity,and the general trend observed is as expected a decrease of velocity as the micritic grain content,mean pore diameter and dolomite content increase,or the sparite cement content decreases. This study will demonstrate that the transformation of diagenetic facies will probably make the petrophysical properties of the oolitic shoals regularly changed. The reflection configuration of diagenetic facies in the oolitic shoals can be shown in the synthetic seismic model simulated according to the P-wave impedance and S-wave impedance.

     

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