新疆石油地质

新疆石油地质 ›› 1989, Vol. 10 ›› Issue (4): 81-85.

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对用渗透率贡献值法求原始含油饱和度的讨论

李兴训   

  1. 新疆石油管理局勘探开发研究院
  • 收稿日期:1988-04-24 发布日期:2020-05-12

DISCUSSION QF ESTIMATING ORIGINAL OIL SATURATION WITH THE PERMEABILITY BUTION VALUES METHOD

Li Xingxun   

  1. Research Institute of Petroleum Exploration and Development,Xintjiang Petroleum Adminisiration
  • Received:1988-04-24 Published:2020-05-12

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摘要： 用沃尔公式求各级孔喉为渗透率所作出的贡献值累计至99.9％时,常出现粗孔喉而原始含油饱和度低的现象,本文通过车排子2号井区的实际资料和假想的两条毛管压力曲线都证实了这一现象。为此建议在应用时采用引进油水界面张力(σow、油水密度差（△d）和油柱高度（h）等参数的公式,其结果较为真实,用rnmin=σow/[(σow/rk)+4.9h.△d]求出rnmin后,其对应的汞饱和度为原始含油饱和度。

Abstract: When one accumulates the permeability contribution values for ranges of poresizes,derived from Wall's Equation, to 99.9%, it often occures that the pore throat is still large but the corresponding oil saturation is low. This is explained with one field example from Well No. 2 District, Chepaizi, and one theoretical capillary pressure curve. It is therefor suggested that Qu's Equation, which takes into account the interfacial tension between oil and water (σow) the difference between oil and water densities (△d), and the height of the oil column， be used to estimate the original oil saturation. When rnmin is calculated from rnmin = Bow/ ,ow/ tk)+4.9b*△d], the corresponding mercury saturation is the original oil saturation. This results in a more reasonable value.