岩性油气藏 ›› 2015, Vol. 27 ›› Issue (3): 7581.doi: 10.3969/j.issn.1673-8926.2015.03.011
舒丽娟
SHU Lijuan
摘要:
奈曼凹陷的非烃流体主要指 CO2,H2S 和 N2。 通过伴生气组分分析,结合区域构造发育史、非烃流体含量及碳同位素分析资料,对奈曼凹陷非烃流体成因、进入油藏时间、保存及分布的控制因素进行了深入探讨。研究认为:奈曼凹陷 CO2 和 H2S 均来自幔源成因岩浆喷发,先于烃类进入储层;CO2 的富集程度与地层水中的 HCO3- 浓度呈正比;H2S 性质不稳定,目前以痕量 H2S、含硫有机化合物及黄铁矿结核的形式存在,H2S 和含硫有机化合物的富集程度与 SO42- 浓度呈正比;N2 来自大气成因,燕山晚期进入储层,浅部地层及浅层断裂附近 N2 富集。 砂体的展布特征控制非烃流体的平面展布规律,泥岩厚度及泥岩与砂岩的配置关系控制非烃流体的保存条件。该研究成果为奈曼凹陷下一步油气勘探部署提供了一定的理论依据。
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