鄂尔多斯盆地延长组特低渗透砂岩微观孔喉特征的定量评价

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Abstract The samples of Yanchang group in Ordos basin are tested with constant rate mercury penetration technique，pore throat characteristics parameters are characterized quantitatively in order to recognize the micro-pore throat characteristics and to make definite the key factors controlling reservoir quality and development effect. The results show that difference of pore is little，pore radius distributes in 70–225 μm，peak value is about 110 μm. When the permeability is low，the throat distributes assembly，the content of small throat is high，the contribution of throat to permeability also distributes intensively and contribution of peak value is big. Distribution range of throat radius will become wide，large pore content will increase and its contribution will broaden with the increasing permeability. Average pore radius and permeability present good correlation. Fluctuation amplitude of average pore radius is great when the permeability is less than 1.0×10－3 μm2. Sensibility of extra-low permeability sandstone roots in particular throat characteristics. The poor physical properties(especially permeability) lie in the high content of small throat. The well the physical property is，the more the effective pore and throat develop. Difference of micro-pore throat mainly is presented in the pore size and its distribution. The pore controls the reservoir quality and affects development effect.

Key words： rock mechanics pore characteristics throat distribution effective pore throat volume constant rate mercury penetration extra-low permeability sandstone Ordos basin

Received: 23 April 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3116

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