Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (1): 286-294.doi: 10.13278/j.cnki.jjuese.201601306

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Fine Evaluation of Permeability of Conglomerate Reservoir Based on Flow Unit

Zheng Xiangwei, Wu Jian, He Shenglin, Hu Xiangyang, Liang Yunan   

  1. Zhanjiang Branch of CNOOC Ltd, Zhanjiang 524057, Guangdong, China
  • Received:2015-05-07 Online:2016-01-26 Published:2016-01-26
  • Supported by:

    Supported by National Science and Technology Major Project (2011ZX05023-004)

Abstract:

With the exploration and exploitation in western Southern Sea, there are an increasing number of conglomerate reservoirs being found. In the conglomerate reservoirs of the study area, the pore structure is complicated, permeability varies greatly among reservoirs of basically equal porosity, and the response in logging to oil-water layers is not obvious in hypotonic conglomerate reservoirs. Facing these issues, the authors analyze the pore structure characteristics and its influence on reservoir electricity, and generalize the permeability distribution and other factors in different sedimentary environments. Regionally, closed to its provenance, the quickly piled debris heteroaryl fills the pores, and this results in the low permeability of the reservoir; While far away from the provenance, the pores are improved by dissolution effect, yielding a good pore connectivity and permeability unless the reservoirs suffered strong compaction. Microscopically, pore-throat radius of rock determines permeability to some extent. According to different sedimentary environments and pore structure characteristics, by use of flow unit analysis, the conglomerate reservoirs are divided into three types. The reservoir performance factors, including compensated density, compensated neutron, mud content and lay flow index, are used for ambiguous clustering analysis to get the Fisher linear discrimination model so as to set up the logging interpretation model for three main kinds of conglomerate reservoirs. The permeability model built by the flow unit method is more accurate than that by conventional methods, and also more practical in the areas of interest.

Key words: sand conglomerate, pore structure, provenance, flow unit, permeability log interpretation, Beibuwan basin

CLC Number: 

  • P631.8

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