Lithologic Reservoirs ›› 2008, Vol. 20 ›› Issue (4): 71-74.doi: 10.3969/j.issn.1673-8926.2008.04.013

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Influence of chlorite film on reservoir porosity：A case study from the second member of Yanchang Formation in Ordos Basin

LI Hong1，WANG Furong1，DAI Shili1，FAN Hao2   

  1. 1. The Faculty of Resources， China University of Geosciences， Wuhan 430074， China； 2. Hainan Oil & Gas Exploration Branch Company， Liaohe Oilfield Company， PetroChina， Panjin 124010， China
  • Online:2008-12-15 Published:2008-12-15

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Abstract:

Chlorite film developed well in the reservoir sandstone in the second member of Triassic Yanchang Formation in Ordos Basin. According to the regional geologic information and core slice observation, it is concluded that chlorite film formed in the early diagenetic stage, and the porosity increased with the increasing of chlorite film content. So chlorite film takes a constructive diagenesis on the reservoir porosity in this area. This effect is manifested mainly in three aspects: repressing the quartz overgrowth, enhancing the mechanical strength of rocks and resistance to compaction, and repressing the pressure solution by occupying the space of carbonate cement.

Key words: sedimentary system, vertical distribution of reservoir, Silurian, Tahe area

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