But the level of maturity of organic matter in the source rocks is obviously lower, because the lower tertiary source beds are of shallower burial and smaller geothermal gradient.
但由于生油层埋藏较浅，地温梯度偏低，致使各生油层有机质的成熟度明显比好生油凹陷低，主要生油层目前仍处于低成熟—成熟演化阶段。
By using a new method and pyrolysis date of rock, study on expulsion efficiency of hydrocarbon for lower tertiary source rock has been carried out in north area of lower Dongpu Depression.
利用岩石热解资料，采用一种新的方法，对东濮凹陷北部地区下第三系源岩的排烃效率进行了研究。
The gas of QHD30 1 is mixed gas and mainly from the coal derived gas from pre Tertiary source rocks.
QHD3 01气藏的天然气属多源混合气，主气源为前第三系的煤成气。
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。
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。
So the migration related to fractures is the main mechanism of hydrocarbon expulsion of the Low Tertiary source rocks in the Dongying Depression.
因此，与裂缝相关的油气运移机制是东营凹陷下第三系烃源岩排烃的主要机制。
In west Qaidm Basin, 17 oilfields with Tertiary source rocks have been found. The main source rocks are Lower Ganchaigou Formation of terrestrial facies of Eocene.
柴达木盆地西部已找到17个第三系油源的油田，其主要烃源岩层位是陆相始新统下干柴沟组。
On the basis of geological analysis, geochemical detection and simulation experiments, the hydrocarbon expulsion mechanisms of the Low Tertiary source rocks were studied in the Dongying Depression.
本文采取地质研究、地球化学分析测试与物理模拟实验相结合的方法，研究了东营凹陷下第三系烃源岩排烃机理。
On the basis of geological analysis, geochemical detection and simulation experiments, the hydrocarbon expulsion mechanisms of the Low Tertiary source rocks were studied in the Dongying Depression.
本文采取地质研究、地球化学分析测试与物理模拟实验相结合的方法，研究了东营凹陷下第三系烃源岩排烃机理。
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