油层物理定义及部分公式集合.pdf

Definitions and formulas 油层物理定义和部分公式集合 Chapter 1 Size composition （粒度组成）：It is defined as the composition of contents of various size particles forming sandstone, often expressed in percent by weight. a＝d60 ／d10 （不均匀系数计算式） S d d 75 25 （分选系数计算式）     84 16 95 5   4 6 6 . （标准偏差） Specific surface （比面）: It is defined as the total internal surface area of void space within unit volume of rock. 3 AH S 14  Q L 0  （透过法计算比面） Pore structure （岩石孔隙结构）：It means all factors of the type, size and distribution, shape, connectivity and surface roughness of rock pore as a whole. Ratio of pore throat （孔喉比）: the proportion of pore diameter (radius) to throat diameter (radius). Pore constriction number （孔隙配位数）: It means the number of the throats that are connected with one pore. Pore tortuosity （孔隙迂曲度）: It is the ratio of the actual distance (l) that a mass point flows along pore passages within rock to the apparent length of the rock (L) Porosity (孔隙度) : It is the ratio of the total void space in rock to the bulk volume of rock, expressed in percent. REV （表征性体积单元）：It is the smallest rock’s volume that can represent the average characteristics of physical properties of the reservoir rock. Cf (岩石压缩系数): It is defined as the reduction of pore volume within unit volume of rock as reservoir pressure decreases a unit pressure. Fluid saturation （流体饱和度） : It is defined as the percentage of pore volume which has been filled with some kind of fluids in the pore of reservoir rock. Q=(KA△p x 10)/uL (达西公式) （气测岩石渗透率）