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碳酸盐烃源岩由于胶结作用发育 ,固结成岩较早 ,所以 ,其排烃作用并非一定以压实作用为主 ,而是多种作用互存。不同的演化阶段排烃方式各异 ,在高过成熟阶段以微裂缝排烃和分子扩散为主。以一维地质模型为基础 ,根据生、排烃质量守恒原理可以定量建立扩散排烃和微裂缝排烃的数学模型。鄂尔多斯盆地奥陶系马家沟组依此模型进行的模拟结果表明 :马家沟组在早二叠世末进入生烃门限 ,三叠纪末达到生油高峰 ,早白垩世开始进入过熟干气阶段 ;现今累计排烃率为 6 0 ～ 80 ,其中 ,压实排烃、扩散排烃和微裂缝排烃占主导地位 ,水溶相排烃只占很小比例。
Due to the cementation of carbonate source rocks and the earlier consolidation of diagenesis, the hydrocarbon expulsion is not necessarily dominated by compaction but rather interdependent. In different stages of evolution, hydrocarbon expulsion modes are different, and in the over-mature stage, hydrocarbon expulsion and molecular diffusion mainly dominated. Based on the one-dimensional geological model, the mathematical model of hydrocarbon expulsion and micro-fracture hydrocarbon expulsion can be quantitatively established according to the principle of conservation of mass and expulsion of hydrocarbons. According to this model, the Ordovician Majiagou Formation in the Ordos Basin shows that the Majiagou Formation entered the hydrocarbon generation threshold at the end of the Early Permian period and peaked at the end of the Triassic. From the Early Cretaceous, Gas phase. At present, the cumulative hydrocarbon expulsion rate is between 60 and 80, of which, hydrocarbon expulsion, diffuser hydrocarbon expulsion and microfracture hydrocarbon expulsion dominate, while water-expulsion hydrocarbon expulsion only accounts for a small proportion.