源岩层的非均质性和微裂缝对初次运移十分不利，它们把油气滞留在源岩层内使其成为微油藏。
The heterogeneity and micro-fissures in source rocks are unfavorable to primary migration of oil and gas, which retained some oil gas within the source rocks forever as micro-reservoirs.
源岩层的非均质性和微裂缝对初次运移十分不利，它们把油气滞留在源岩层内使其成为微油藏。
The heterogeneity and micro-fissures in source rocks are unfavorable to primary migration of oil and gas, which retained some oil gas within the source rocks forever as micro-reservoirs.
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