主要勘探目的层是第三系的沙河街组地层。

The main exploration target is the Tertiary Shahejie Group.

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第一部分，给出李三系的基本概念以及一些基本性质。

In section 1, we give the basic definitions and some basic properties of Lie Triple System.

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QHD3 0 1气藏的天然气属多源混合气，主气源为前第三系的煤成气。

The gas of QHD30 1 is mixed gas and mainly from the coal derived gas from pre Tertiary source rocks.

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