射孔密度、射开厚度、孔眼直径及临界流速增加时，砾石充填最小排量也增加。
The minimum injection rate of gravel pack increases while increasing the diameter of perforation tune, the perforation density, the perforated thickness and the critical velocity.
每次冰期及间冰期沉积物中的砾石及其岩性，砾态，沉积厚度，风化程度等都有明显区别。
The gravels in deposits of different glacial epochs and interglacial stages show obviously different rock characteristics, gravel forms, deposit thicknesses and weathering degrees.
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