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裂解气成因特征及成藏模式探讨

Keywords: 裂解气,实验模拟,成因特征,成藏模式

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Abstract:

?中国现阶段干酪根高演化阶段裂解气和原油裂解气探明储量占总储量26%以上,有必要系统研究该类天然气的形成、分布特征及下一步勘探方向。在大量源岩高演化生烃模拟和原油裂解模拟实验基础上,结合国内外裂解气研究成果,进一步分析了原油、海相—湖相泥岩及湖相煤系源岩裂解气的成因特征,并提出了5种成藏模式。原油裂解一般认为地温大于150℃以上时发生,实验证实一些地区在高于190℃才开始形成裂解气;烃源岩裂解气主要是干酪根芳甲基和终端甲基断裂,海相泥岩在ro值接近3%时裂解生气潜力接近枯竭,湖相煤系源岩在ro值为2.5%~5%时仍有较大的生成甲烷潜力,该阶段生气量占总生气量20%以上,而湖相泥岩裂解潜力介于二者之间,相对而言煤系源岩裂解气最具有潜力。裂解气主要具有古隆起原油裂解气、古风化—岩溶斜坡源岩裂解气、致密砂岩煤系源岩裂解气、特殊储集体裂解气、煤层—页岩源内裂解气5种成藏模式,古老海盆古隆起和斜坡、海陆过渡相盆地致密砂岩、中新生代湖相盆地特殊储集体是重要的勘探方向。

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