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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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济阳坳陷深层裂解气成因鉴别及其成藏差异性
Keywords: 济阳坳陷,深层,干酪根裂解气,原油裂解气,成藏差异性
Abstract:
？济阳坳陷深层裂解气藏成因较为复杂，影响了深层天然气的认识和勘探。利用天然气组分和碳同位素等鉴别了原油裂解气和干酪根裂解气，进一步分析了2类成因的成藏差异性。原油裂解气表现为ln(c2/c3)值随ln(c1/c2)值增大而增大；干酪根裂解气随ln(c1/c2)值的增大，ln(c2/c3)值基本不变。在有机质类型和热演化程度大致相当的情况下，原油裂解气δ13c1值、δ13c2值、δ13c3值与相应的干酪根裂解气的最大差值分别为-12.4‰、-8.8‰和7.5‰；随着δ13c1值或(δ13c1-δ13c2)值的增大，干酪根裂解气(δ13c2-δ13c3)值快速减小，而裂解气(δ13c2-δ13c3)值变化微弱。干酪根裂解气藏表现为早期油气扩散、断裂活动停止和后期天然气充注，原油裂解气藏体现为早期油气充注、岩性侧向封堵和后期古油藏裂解的成藏规律。2种裂解气成因开启了深层天然气勘探的新思路，并指出了其勘探方向，对深层勘探具有重要的指导意义。？
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