请教petrel如何计算净毛比？

badboy0504

刚接触petrel不久，不知道在petrel中如何计算净毛比呢？
已知有效厚度，并且构造模型已经建立好。

还有一个问题，如何利用等厚图建立构造模型？砂厚要比建立的网格模型每个层的厚度小，怎么办？

如果能给解释明白，悬赏20个阳光币！

fishing

刚接触petrel不久，不知道在petrel中如何计算净毛比呢？
已知有效厚度，并且构造模型已经建立好。

还有 ...
badboy0504 发表于 2011-9-2 15:30

    for each cell, NTG=0 or 1: you can use calculator to get it, e.g. NTG=if(facies=sandstone and porosity>0.1, 1,0)

岱海青蓝

我觉得，净毛比最好要有先期的认识，知道哪里为有效储层，含油面积是多少，不然直接模拟的话效果很难说，毕竟这个对储量的影响还是很大的。因为岩相活测井相模型容易修改，所以把岩相模型跟已有的认识结果一致，再通过计算器功能限制净毛比模型。如果没有先期的认识，就不好说了，看建模水平了，呵呵，抛砖引玉^^

fishing

for your second question, it is normal. sandstone thickness is less than zone thickness, that is why we have NTG value(<1).

badboy0504

回复 4# fishing


    我知道原因是什么，但是能否直接用砂厚建模？

badboy0504

回复 2# fishing


    为什么每个网格的净毛比不是0就是1呢？0.7、0.8是怎么出来的？是粗化以后的吗？如果没有相建模，如何计算？

fishing

回复  fishing


    我知道原因是什么，但是能否直接用砂厚建模？
badboy0504 发表于 2011-9-2 18:45

    modeling?
your mean stratigraphic model? or facies model?

Sure, you can use sandstone isochore to make facies model. But the data only in well points are considered as hard data-facies well log data, the rest points among wells are considered as soft data (Secondary variable).

fishing

回复  fishing


    为什么每个网格的净毛比不是0就是1呢？0.7、0.8是怎么出来的？是粗化以后的吗？如 ...
badboy0504 发表于 2011-9-2 18:48

    Cell is minimun unit in model, so the cell gets only one value, e.g. a cell is sandstone in facies model. the cell porosity is 0.25 in petrophysical model. etc.
But a layer consists of several cells, we calculate its NTG that could be fall winthin 0 and 1.
Your question is not relative to upscaling or scale up.

It does not matter that you don't have facies model. It depends on Net pay cut criterion. e.g. NTG=if(Sw<0.4 and porosity>0.1, 1,0) even NTG=if(porosity>0.1, 1,0)

badboy0504

回复 10# jigesen


    明白了！

fanmhd2000

我也有疑问，帮顶一下