压汞曲线“双峰态”性质的分析

毛管参数的积分计算法是理论导出的,按级数法的测点选取方法计算时,产生的误差很大.舍去部分高压测点就符合得好.所有岩石样品中都存在这种误差.压汞曲线的双峰态发生在高压部分,其特征是毛管孔径曲线的斜率多变,完全不同于铸体薄片、离心法的单调斜率状态.单调的压力上升与非随机特征说明其属于非孔隙结构因素.双峰态的初始点与渗透率的关系属于力学特征.当前压汞曲线高压极值部分压力变化饱和度不变是人为作用的结果.原始的压汞曲线与岩石应力曲线十分相似.压汞测量时岩样处于围压状态.原始的压汞曲线不仅有双峰态,压力极大处还表现为“鹰嘴现象”.这是岩石孔隙内部填充流体分别为注汞和无汞两种介质不同的结果.积分法可以减少测量点数,提高工作效率,缩短工时,有利健康,延长仪器寿命.

AN ANALYSIS ON DOUBLE HUMP DISTRIBUTION OF INTRUSIVE MERCURY CURVE

The integration calculation of capillary parameter is derived theoretically. It occurs comparitive error when calculating selected at the measure point with the progression has been taken place. It is fitted well to eliminate the part highpressure measure point. All the rock samples exist with this error. The hump distribution of intrusive response on mercury injection curve appears in the highpressure section, whose characteristics are the variable slope of capillary pore diameter curve, which is different from the monotonous slope of the cast thin section and centrifugal method. The mono increasing for the pressure and nonrandom property shows to be of nonfactor for pore configuration. The relations between the initial point of double hump distribution of intrusive and the permeability is belong to mechanics property. Now that the saturation does not change when the pressure changes at the maximum in the mercury injection curve part that is the manmade result. The original mercury injection curve is very similar to the curve of rock stress. The rock sample is under confining pressure state when mercury injected measure occurs. The original mercury injection curve appears not only with the double hump distribution of intrusive, but also the eaglemouth model at the maximum pressure. This is the result of the different medium with or without mercury, when filling the fluids into porous body of rocks. The integral method can reduce the measure points, raise the work efficiency, shorten the working time, be help for the health, prolong the life of instruments.