西南石油大学学报(自然科学版)

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Genesis of Low Resistivity Limestone Reservoirs in Oilfield A of Syria

Xia Dongdong1, Sima Liqiang2, Zhang Qinghong1, Pang Wen1   

  1. 1. Exploration and Production Research Institute of SINOPEC,Haidian,Beijing 100083,China
    2. School of Geoscience and Technology,Southwset Petroleum University,Chengdu,Sichuan 610500,China
  • Online:2014-10-01 Published:2014-10-01

Abstract:

J Formation in Oilfield A of Syria is a rare low resistance limestone reservoir in the world,with high porosity,
low permeable matrix reservoir and with resistance of 0.5∼5.0 Ω·m lower than water layer. Because few studies have been
made on the causes for this low resistance reservoir before,to correctly evaluate the reservoir,this paper analyzes the forming
mechanism and dominating factors of low resistance carbonate oil formation. We found that the special geological background
is the basic of petrophysical origin in low-resistivity oil formation. The petrophysical origin uncovers the essence low-resistivity
in carbonate oil formation. Low amplitude structures and weak hydrodynamic sediment are the geological background of lowresistivity
oil formation. High irreducible water saturation,high formation water salinity,additive conductivity of clay minerals
and conductive mineral are the internal causes for low-resistivity oil formation. The formation of low-resistivity reservoirs in
carbonate rock is the result of macroscopic geological background and microscopic petrophysics characteristics.

Key words: limestone, origin of low resistance, low-relief structure, irreducible water saturation, pore structures, formation water salinity