但油气演化程度高，大多已进入高成熟和过成熟阶段，至今只在侏罗系发现有油藏，三叠系及其更老地层皆为气藏。
Owing to its high evolution, high or over maturity, oil pools only have been discovered in Jurassic, in Triassic or even older beds only dis - covered gas pools.
在海相过成熟碳酸盐岩干气区由油系烃源层、煤系烃源层形成的烃源，制约着气藏的形成与展布。
The gas-pool formation and distribution are controlled by hydrocarbon source from oil-measure and coal-measure strata which constitute a dry gas area of marine over-mature carbonate rock.
综合分析后认为，本井天然气来源于本区石炭—二叠系过成熟阶段生成的干气。
The results revealed that the natural gas of well AK1 originated from dry gas formed in the postmature stage of the Carboniferous-Permian in the study area.
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