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

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。

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So compaction is not the main mechanism of hydrocarbon expulsion of the Low Tertiary source rocks in the Dongying Depression.

因此，压实排烃不是东营凹陷下第三系烃源岩排烃的主要机制。

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The natural gas of the main type in North China Basin is generated in the symbiotic window of oil and gas in Lower Tertiary source rocks.

华北盆地天然气的主要类型是下第三系源岩在油气共生窗中生成的。

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