岩性油气藏 ›› 2025, Vol. 37 ›› Issue (1): 4152.doi: 10.12108/yxyqc.20250104
何星1, 金玮2,3, 张帆2,3, 霍秋立2,3, 李跃2, 鲍俊驰2,3, 刘璐2,3, 曾庆兵4
HE Xing1, JIN Wei2,3, ZHANG Fan2,3, HUO Qiuli2,3, LI Yue2, BAO Junchi2,3, LIU Lu2,3, ZENG Qingbing4
摘要: 海拉尔盆地乌尔逊凹陷白垩系铜钵庙组勘探获得突破,是资源潜力较大的新层系。通过TOC、热解、Ro、族组成、色谱、色质、δ13C等分析化验资料,对研究区各洼槽各小层的烃源岩进行了丰度、类型和成熟度评价,深入分析了铜钵庙组原油地球化学特征,定量计算了原油来源,并预测了下步有利勘探方向。研究结果表明:①海拉尔盆地乌尔逊凹陷铜钵庙组整体发育TOC平均值为1%、类型以Ⅰ—Ⅱ2型为主的中等烃源岩,其中铜二段泥岩也可见Ⅰ型烃源岩,洼槽区Ro为0.6%~1.5%,处于成熟阶段。②研究区铜钵庙组原油可分为乌北铜三段原油、乌南铜三段原油和乌南铜二段原油3类。乌北铜三段原油高饱和烃,姥植比高,饱和烃与芳烃δ13C偏重,C27重排甾烷和三环萜烷含量高。乌南铜三段原油具有高饱和烃、饱和烃与芳烃δ13C偏轻,C27重排甾烷和三环萜烷含量中等。乌南铜二段原油饱和烃含量低,奇偶优势比(OEP)值高,饱和烃与芳烃δ13C轻,C27重排甾烷和三环萜烷含量低。③研究区铜钵庙组3类原油均来源于南屯组南一段泥岩和铜钵庙组泥岩的二元混合,乌北铜三段原油与乌北南一段烃源岩更接近,乌北南一段泥岩的贡献比例为62.9%;乌南铜三段原油与乌南南一段烃源岩更接近,乌南南一段泥岩的贡献比例为59.5%;乌南铜二段原油与乌南铜二段烃源岩更接近,乌南铜二段泥岩的贡献比例为75.4%。④乌北和乌南洼槽发育厚度大于200 m的暗色泥岩,可为铜三段油藏和铜二段油藏供烃,乌北洼槽和乌东斜坡带为乌尔逊凹陷铜钵庙组下步甩开勘探的有利区带。
中图分类号:
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