The theory of hydrocarbon expulsion threshold was applied in a numerical simulation of hydrocarbon expulsion from lower-Jurassic coal source rocks in Taibei Sag, Turpan-Hami Basin.

应用排烃门限控油气理论，对吐哈盆地台北凹陷侏罗系煤源岩排烃过程进行了数值模拟。

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Xihu Sag is a giant depression basin with coal beds of Pinghu Formation as its main hydrocarbon source rocks.

西湖凹陷为一大型坳陷盆地，其主要烃源岩为平湖组煤系地层。

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Permo Carboniferous coal series have relative good coal gas potential, dark mudstones in lower Jurassic, lower part of Middle Jurassic and lower Cretaceous are the best source rocks.

区内石炭—二叠纪煤系具有良好的煤型气及一定的煤层气潜力，中、下侏罗统和下白垩统暗色泥岩类是最具生油潜力的烃源岩系。

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