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针对常规压汞实验不能区别孔隙和喉道的弊端,应用恒速压汞技术对低渗透储层孔喉进行了定量评价,并深入分析了影响低渗透储层可动流体饱和度的主控因素。结果表明:渗透率越小,喉道半径分布范围越窄,其峰值也越小;反之,渗透率越大,喉道半径分布范围就越宽,其峰值也越大;不同物性的样品其孔隙分布特征不显著,主要体现为喉道分布特征不同。可动流体由孔隙和大喉道中的流体共同组成,与所处空间位置无关,只与孔隙和喉道半径有关。核磁共振可动流体的有效孔隙体积和有效喉道体积的共同下限半径也就是T2弛豫时间所对应的半径。
Aiming at the disadvantage that conventional mercury intrusion experiments can not distinguish pores from throats, the constant pressure mercury intrusion technique was used to quantitatively evaluate the pore throats of low permeability reservoirs, and the main controlling factors affecting the saturation of movable fluid in low permeability reservoirs . The results show that the smaller the permeability, the narrower the radius of the throat and the smaller the peak value. On the contrary, the greater the permeability, the wider the throat radius and the larger the peak value. The porosity Distribution characteristics are not significant, mainly manifested as throat distribution characteristics are different. Movable fluid from the pore and the throat of the fluid together, regardless of the spatial location, only the pore and throat radius related. The common lower bound radius of the effective pore volume of the nuclear magnetic resonance movable fluid and the effective throat volume is also the radius corresponding to the T2 relaxation time.