Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (3): 701-711.doi: 10.13278/j.cnki.jjuese.201503105

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Identification Marks and Depositional Model of Gravity Flow Channel in Continental Rifted Lake Basin:A Case of the First Member of Shahejie Formation in Qinan Slope, Qikou Sag

Zhang Jing1, Liu Huaqing1, Li Shuangwen1, Ji Hushan1, Yuan Shuqin2, Hong Zhong1   

  1. 1. Research Institute of Petroleum Exploration and Development-Northwest(NWGI), PetroChina, Lanzhou 730020, China;
    2. Petroleum Exploration and Development Research Institute of Dagang Oilfield Corhpany, PetroChina, Tianjin 300280, China
  • Received:2014-09-06 Published:2015-05-26

Abstract:

Case study on the thick layer sandstone of the First Member of Shahejie Formation in Qinan slope, the authors analyzed the distribution characteristics of gravity flow channel in the continental rifted lake basin by the ideas and methods of seismic sedimentology. Combined with the regional geological setting, restaint provenance source, and core observation the types of sedimentary facies, stratal slice, seismic inversion and 3D visualization are determined. According to the study, the sand body should be the gravity flow channel sediments which could be the combination of slump rock, sandy debris flow, and turbidity flow. The gravity current sediment bands distribute along the half graben like faulted trough. In terms of the depositonal regime of gravity flow channel,the turbidity channel is subdivided into three types of microfacies: central channel,channel margin,and subaqueous overflow. A depositional model is established based on the integrated studies. Six lithological facies are recognized in the rock core. The authors discussed the genesis of gravity flow channel and analyzed its pool-formed characteristics. It is revealed that the gravity channel is an important reservoir with a good pool-formation combination and exploration potential in this area. This study indicates a new oil & gas exploring realm in Qikou sag.

Key words: rifted lake basin, gravity flow channel, seismic sedimentology, depositional model, Qikou sag

CLC Number: 

  • P618.13

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