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OALib Journal期刊
ISSN: 2333-9721
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辽河坳陷东部凹陷低熟气地球化学特征
Keywords: 低熟气,地球化学,生物降解,偏腐殖型,辽河坳陷
Abstract:
？通过分析辽河坳陷东部凹陷29个天然气样品的地质和地球化学特征，探讨了研究区天然气成因类型的新认识。研究区主要烃源岩为古近系沙河街组和东营组，母质类型以偏腐殖型为主，热演化程度主体处于0.5%~1.0%之间。天然气组分以烃类气体占绝对优势，干气、湿气并存；δ13c1值为-46‰~-38‰、δ13c2值为-30‰~-25‰、δ2hch4值为-250‰~-210‰；c5-7轻烃化合物中富含异构烷烃，庚烷值和异庚烷值均落在低演化区。对比分析吐哈低熟气特征，指出研究区探明天然气的主体属于低熟气范畴，满足其2个本质属性:母质为偏腐殖型、成熟度处于低演化阶段。气源对比表明，天然气主要来源于古近系沙三段(es3）陆相湖盆偏腐殖型源岩，它的成熟度(ro）与基于“δ13c1—ro计算得出的天然气ro值(0.50%~0.90%）在空间分布特征上相吻合。此外，微生物活动对气藏后期的改造作用也不容忽视:大部分c2+烃类被微生物消耗而使天然气组分变干；c2、c3含量降低至一定程度时，δ13c2值、δ13c3值呈现异常高，甚至达到正值，而δ13c1值受微生物活动影响较小；正庚烷容易被降解而使研究区天然气庚烷值相比吐哈低熟气更低。
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