However, in order to compare data between Wells it is important to have a valid, area wide reference for comparison. This is the permanent datum level.
但是为了对不同的井进行比较，需要确定一个区域的有效的永久深度参考面。
However, in order to compare data between Wells it is important to have a valid, area wide reference for comparison. This is the permanent datum level.
但是为了对不同的井进行比较，需要确定一个区域的有效的永久深度参考面。
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