[余依宁]

想做一个沉积旋回的地质模型，不知怎样假设比较合适，比如应该设几层砂岩，几层泥岩，速度，厚度分别为多少？麻烦知道的指导一下，最好能给我一组比较合适的数据，多谢啦，

[余依宁]

我没说清楚，是想做一个模拟地下地层的模型（不一定是正旋回），是砂、泥岩相互交替的地层，不知道密度，速度，厚度要怎样取才比较符合实际，求指导

[ytlee]

you can't make a model without knowing what have in mind.

The first rule of modeling is a clear agenda, a set goal you want to accomplish.. Otherwise, it is just a fishing expedition

BTW, if you are a student, you better abandon your way of begging someone doing homework for you.