吴小奇1,2,倪春华2,陈迎宾1,2,朱建辉2,李贶2,曾华盛2
Wu Xiao-qi1,2,Ni Chun-hua2,Chen Ying-bin1,2,Zhu Jian-hui2,Li Kuang2,Zeng Hua-sheng2
摘要: 定北地区是中国石化在鄂尔多斯盆地的重要探区之一,近年来该区上古生界天然气勘探取得了重要突破,但对该区天然气成因和来源的研究程度偏低,前人对盆地内上古生界天然气是否发生了大规模侧向运移也存在争议。天然气地球化学特征研究表明,定北地区上古生界天然气为典型干气,干燥系数(C1/C1-5)介于0.977~0.986之间,δ13C1值、δ13C2值和δD1值分别为-30.6‰~-28.6‰、-25.9‰~-24.1‰和-191‰~-177‰,CH4、C2H6碳、氢同位素组成均为正序特征。烷烃气碳、氢同位素组成等综合表明,定北地区上古生界天然气为典型煤成气。根据煤成气二阶段分馏模式计算所得RO值与定北地区上古生界烃源岩样品实测RO值一致,表明定北地区上古生界天然气主要来自原地的太原组—山西组烃源岩。位于鄂尔多斯盆地东北部的大牛地气田与定北地区相比,其天然气具有较低的δ13C1值、C1/值1-5和C1/C2+3值及更高的C2/C1值,表现出来自相对较低成熟度的烃源岩的特征而不是运移效应,这表明鄂尔多斯盆地上古生界天然气未发生大规模的侧向运移。
中图分类号:
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