基于恒速压汞技术的致密砂砾岩储集空间刻画

Application of ConstantRate Mercury Penetration Technique in Studying the Microscopic Pore Space of Tight Sandy Conglomerates Reservoir

杨少英

Yang Shaoying

大庆油田有限责任公司 海拉尔石油勘探开发指挥部,内蒙古 呼伦贝尔 ,021000

  Halaer Exploratory Development Headquarters，Daqing Oilfield Company Ltd.,Hulunbuir Inner Mongolia 021000, China

关键词: 致密, 砂砾岩, 储层, 孔隙结构, 恒速压汞

Constant-rate mercury penetration was used to study the microscopic pore space of tight sandstone reservoir in Shahezi formation of Xujiaweizi depression, and distribution of pore and throat and their control on reservoir physical were analyzed．The results show that the distribution range of pore radius is mostly 100~200 μm and is barely influenced by reservoir physical. The correlation of pore radius and reservoir physical is not significant, thus the pore radius has the secondary control on petrophysical property. Throat radius varies greatly with the reservoir permeability, and the distribution range of throat radius tends to increase with the reservoir permeability. However, the distribution range of throat radius is no more than 5μm in value. Throat radius is correlated with porosity slightly, while it is strongly influenced by permeability, indicating that throat is the main factor that controls reservoir. The porethroat connectivity of sandy conglomerate samples is not well, with pore throat ratio ranging form 20~600. The throat favorable for reservoirs is mainly over 0.5 μm in radius and less than 200 in pore throat ratio.

中国石油天然气股份公司重大科技专项“大庆油田原油4000万吨持续稳产关键技术研究”(2011E-1202)。