Articles

New Calculation Method for Interlayer Dip and Its Application in Beach-bar Sand Mud Interlayer Depiction

  • WU Xiaobin ,
  • HOU Jiagen ,
  • WANG Daxing ,
  • CUI Zhilin ,
  • LI Shuqing
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  • 1. College of Energy & Environment Engineering, Yan'an University, Yan'an 716000, China;
    2. College of Earth Sciences, China University of Petroleum, Beijing 102249, China;
    3. Second Oil Industry, Dagang Oil Field, PetroChina, Tianjin 300280, China;
    4. First Oil Industry, Dagang Oil Field, PetroChina, Tianjin 300280, China

Received date: 2013-09-26

  Revised date: 2014-03-17

  Online published: 2014-05-13

Abstract

In order to study the distribution of the internal residual oil in a beach-bar sand body, and to reveal the interbed development pattern, the mud interlayer should be described quantitatively. This paper considers three interbed types of bar sand bodies, using the core data, the logging data in the Gangzhong oilfield and the sedimentation investigation results in Qinghai Lake. With a 3D architecture model and the principle of the dip angle measurement, a new approach of calculating the dip angle of the interbed within a single bar sand body is proposed: Scanning of the maximum along the interface in the 3D model. The twin well spacing calculation method is improved. The development pattern of the interbed is obtained by using a quantitative description of the interlayer. A new understanding of the interbed of the bar sand body is achieved. In the Gangzhong oilfield, the muddy interbed is mainly developed within a single bar sloping to the center of the basin, and the dip angle is between 2°and 5°. Meanwhile, there is one muddy interbed every 70 m. The scale of the hyperplasia sandbody is about 60-90 m.

Cite this article

WU Xiaobin , HOU Jiagen , WANG Daxing , CUI Zhilin , LI Shuqing . New Calculation Method for Interlayer Dip and Its Application in Beach-bar Sand Mud Interlayer Depiction[J]. Science & Technology Review, 2014 , 32(12) : 48 -53 . DOI: 10.3981/j.issn.1000-7857.2014.12.007

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