油层物理定义及部分公式集合

（气测岩石渗透率） Slip phenomenon(滑脱现象)： It means the phenomenon of the
velocity of gas molecules not being zero at the wall of capillary because of the distribution of flow rate of gas in the section of capillary deviating from the flow behaviors of viscous fluid while gas flows through porous medium at low pressure. It is also called slippage effect.
Chapter 2
Petroleum (石油):
It a mixture which is mainly coHale Waihona Puke Baiduposed of
hydrocarbon compounds and exists in the form of gas state, liquid state and solid state in nature. It includes crude oil and natural gas. Crude oil(原油)： It is unprocessed liquid petroleum which is recovered from oil well. It is a flammable liquid or solid mineral mainly compounds of a variety of hydrocarbon. Natural gas( 天然气 ): It is combustible gas which is buried
phenomenon which takes place in reverse to conventional behavior of a system while system pressure declines at constant temperature. Saturation pressure（饱和压力）：It is the reservoir pressure at which the natural gas dissolved in oil is just the state of saturation at reservoir temperature. Flash separation(闪蒸分离): in the condition of constant T, let the pressure of a system decline gradually to a appointed pressure (separation pressure), then separate gas completely from the system after the system having arrived gas-liquid equilibrium state. Stage separation（级次脱气）: in the process of degassing, decline pressure of separator in turn, and then separate entirely the gas degassing from oil at each separation pressure from separator. Repeat the degassing process time after time till the pressure of system declines to the appointed pressure. Solubility（溶解度）： which is defined as pressure. the gas volume
Composition （组成）：It is a proportional constitute of components of a system. Phase state(相态)：It is the state of phase equilibrium. Phase diagram(相图)：It is the plot which is used for describing the relation between phase equilibrium state and the attributes of substance system. Single component system（单组份体系）： there is only one component in a substance system. Bicomponent system(双组份系统): there are two components in the system. Bubble-point curve （泡点线） ： the locus of the points of T and P at which the first bubble of gas formed in passing from the liquid to the two-phase region. Dew-point curve(露点线): the locus of te points of T and P at which the first droplet of liquid formed in passing from the vapor to the two-phase region. Retrograde condensation(反凝析): it means the condensate
调和平均 Sensitivity mineral（敏感性矿物）： It it means such kinds of minerals which are sensitive to water , oil, salt or other matters seeping into oil bed , or are sensitive to the velocity of fluid flowing within oil bed during the process of developing oil reservoir. And because the sensitivity of these minerals, the permeability of reservoir will get bad. Jamin effect(贾敏效应)： It generally refers to various effects of additional resistance which are resulted from the deformation of droplet or bubble while it passes through narrow pores. Finger advance(微观指进)： It is the phenomenon that in parallel pores with different diameters, the difference of the places of phase interface is increasing with the increasing of displacing time.
underground and mainly composed of hydrocarbon compounds. System(体系)：It is the researched part of matter. Phase(相)：It is the homogeneous part of a system, in which there are selfsame physical properties and chemical properties. Component(组分)：It is all same kinds of molecules in a system. Pseudo-component （拟组分）：It is a sort of hypothetical component which includes several single components in a system. It is often used in the calculation of petroleum engineering.
S 14 3 AH Q0L
（透过法计算比面） connectivity and surface roughness
Pore structure（岩石孔隙结构）：It means all factors of the type, size and distribution, shape, 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.
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 d75 d 25
84 16
4 6.6
（分选系数计算式） （标准偏差）
95 5
Specific surface（比面）: It is defined as the total internal surface area of void space within unit volume of rock.
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. C f (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)