[风中感伤]

各位大侠，小弟在进行测井学习，目前，利用测井资料计算渗透率只能达到数量级精度，数量级精度怎么理解？

[stock]

If you get a value of 500 md from your log, then the real reservoir permeability may not be lower than 50 md, and may not be higher than 5000 md.

Most likely, the real number will fall into a range of 150 ~ 1500 md.

[ytlee]

引用框（stock ＠ 11-01-2011 - 11:22）

If you get a value of 500 md from your log, then the real reservoir permeability may not be lower than 50 md, and may not be higher than 5000 md.

Most likely, the real number will fall into a range of 150 ~ 1500 md.

perm compiled from log values without correlation from core/flow test data is meaningless.

[roc999]

引用框（风中感伤 ＠ 11-01-2011 - 10:19）

各位大侠，小弟在进行测井学习，目前，利用测井资料计算渗透率只能达到数量级精度，数量级精度怎么理解？

means it is very inaccurate and imprecise, if you know what I meant. If you have to use it, quantitatively, calibrate it to something (core, formation testing, production) and use it with caution.