问答题 翻译：The permeability of a porous medium may be determined from samples extracted from the formation or by in-place testing.

问答题 翻译：An oil field may have several hundred wells with flow lines that carry crude oil from the wells to the lease tanks.

问答题 翻译：The separation between the various reservoirs is demonstrated in each case by different oil/water and gas/oil contacts in most reservoirs.