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OALib Journal期刊
ISSN: 2333-9721
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曾母盆地中部地区天然气与凝析油地球化学特征及成因
Keywords: 曾母盆地,天然气,凝析油,地球化学特征,油气成因
Abstract:
？在广泛收集和总结前人资料的基础上，依据曾母盆地中部地区10个天然气样品的地球化学组成及碳同位素组成特征，系统分析了天然气地球化学特征及成因；同时对与天然气相伴生的凝析油的生物标志化合物特征进行分析，探讨了其油源。研究表明，曾母盆地中部地区天然气中烃类气体以甲烷为主，干燥系数(c1/c1-5)值介于0.68~0.97之间，既有干气也有湿气，天然气碳同位素具有正序列排列特征，其中δ13c1值介于-45.6‰~-31.5‰之间，δ13c2值介于-32.7‰~-24‰之间，δ13c3值介于-30.1‰~-23.4‰之间，为干酪根初次裂解的有机成因气，既有油型气，又有煤型气；而非烃类气体以co2和n2为主，含量介于11.44%~80.18%之间，且co2碳同位素值较高，介于-10.8‰~-2.4‰之间，为无机成因；与天然气伴生的凝析油具有较高的姥植比，高含量的奥利烷和双杜松烷，与盆地内发育的煤系泥质烃源岩地球化学特征具有较好的可比性，表明凝析油油源为煤系烃源岩。
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