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储层物性下限研究是客观合理认识气藏的基础,常规的研究方法在亲水低孔低渗透储层物性下限的研究中具有较大的局限性。为准确界定该类储层的物性下限,以气体低速渗流机理为指导,以气体低速渗流实验为基础,研究了气体在亲水低孔低渗透储层中的渗流规律,并建立了应用启动压力梯度确定该类储层物性下限的方法,即利用气体低速渗流实验查清研究区储层气体的渗流规律,建立孔隙度、渗透率与启动压力梯度的关系,界定启动压力梯度的临界点,进而确定储层的物性下限。应用该方法对蜀南河包场地区须家河组气藏亲水低孔低渗透储层物性下限进行研究,确定了河包场地区渗透率下限为0.05×10-3μm2,须二段、须四段、须六段有效储层孔隙度下限分别为8.61%,4.67%,5.21%。
The lower limit of reservoir physical properties is the basis for an objective and reasonable understanding of gas reservoirs. The conventional research methods have great limitations in the study of the lower limit of physical properties of hydrophilic low-porosity and low-permeability reservoirs. In order to accurately define the lower limit of the physical properties of these reservoirs, guided by low-velocity gas seepage mechanism and based on low-velocity gas seepage experiments, the seepage law of gas in hydrophilic low-porosity and low-permeability reservoirs was studied, and the application of starting pressure Gradient To determine the lower limit of physical property of this kind of reservoir, that is to find out the relationship between the porosity and permeability and the start-up pressure gradient by using the gas low-velocity seepage experiment to find the seepage law of the reservoir gas in the study area, define the critical point of the start pressure gradient, Determine the lower limit of reservoir properties. This method was applied to study the lower limit of physical properties of hydrophilic low porosity and low permeability reservoirs in Xujiahe Formation gas reservoirs in the area of Shunanhe River. The lower limit of permeability of Hepianhe area was determined to be 0.05 × 10-3μm2, The lower limit of the effective reservoir porosity of the six sections of Pleistocene is 8.61%, 4.67% and 5.21% respectively.