地层系统分类的第一个宇，指太古宙时期所形成的地层系统。旧称太古界、始生界，原属隐生宇（隐生宇后已不使用，改称太古宇或元古宇）。中国的太古宇分为古太古界、中太古界和新太古界，主要出露于华北地层区。
摘要埕北30太古宇为裂缝性潜山油藏，裂缝是其主要的储集空间和流体运移通道。
The Archaeozoic reservoir of Chengbei-30 is a fractured buried-hill oil pool. The fractures are major reservoir space and fluid course.
构造破碎带附近古生界底部和太古宇顶部出现破碎带，表现为高孔隙度、高渗透率带。
Near the décollement structure surface, at the bottom of the Cambrian and the top of the Archean, developed an interjacent fractured zone which shows high porosity and high permeability.
康定杂岩以往被认为是扬子地块太古宇的基底，但近年来的同位素年龄测定结果表明其并不是形成于太古宙。
The complex was traditionally considered as the Archean basement of the Yangtze Block, but recent isotopic dating results indicate that it was not formed in Archean.
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