内蒙古东北部拉布达林盆地上乌尔根软沥青的发现及其意义

Discovery of soft asphalt at Shangwuergen of the Labudalin basin,northeastern Inner Mongolia,China,and its geological significance.

拉布达林盆地上乌尔根尖子山碳酸盐脉中软沥青的发现表明,该盆地曾发生过石油的生成、运移和聚集作用。盆地内的烃源岩达到了成熟—过成熟阶段,有机质类型主要为Ⅱ1型,有机碳含量大于1.0%,生烃潜量大于5mg/g,达到了好烃源岩的标准,为盆地内油气的生成创造了条件。通过多因素生物标志化合物参数综合对比发现,拉布达林盆地的油气与源岩的相关性较好,且主要来自下白垩统上库力组的油页岩。

The discovery of soft asphalt in carbonate veins at Jianzi Mountain, Shangwuergen, Labudalin basin, suggests that generation, migration and accumulation of oil occurred in the basin. The source rocks in the basin have reached maturityovermaturity. The main type of organic matter is type-Ⅱt, the total organic carbon （TOC） is 〉1.0% and the hydrogengenerating potential is 〉5 mg/g, all of which have been up to the standards of good source rocks and create conditions for the generation of hydrocarbon. According to the integrated comparison of the multi-factor biomarker parameters, it is found that the hydrocarbon of the Labudalin basin is well correlated to source rocks and is mainly derived from oil shale in the Early Cretaceous Kuli Formation.