聚类分析在油源对比研究中的应用

Application of clustering analysis to oil and source rock correlation

利用烃源岩、原油(包括油砂)的生物标记化合物的聚类分析研究原油(包括油砂)碳同位素,结果表明,三塘湖盆地的原油可以分成3类,第一类原油包括马朗凹陷的绝大部分和侏罗系的一部分,与中二叠统烃源岩有关;第二类原油主要分布于条湖凹陷,部分位于马朗凹陷,与下二叠统和石炭系烃源岩有关;第三类原油主要为油砂,相关性较差,可能受到了较强生物降解作用的影响.塘参1井侏罗系原油可能来源于下二叠统或石炭系.

The crude oils in Santanghu Basin can be divided into 3 types based on the clustering analysis of the biomarkers of source rock,crude oils and bearing-oil sandstones and the carbon isotope ratios in the crude oils.The first type includes the most of the oils in Malang sag and a part of oils in Jurassic.They are related with the source rocks in Middle Permian.The second type is mainly in Tiaohu sag,and a little in Malang sag.They are related with the source rocks in Lower Permian and/or Carboniferous.The third type is in the all of bearing-oil sandstones,and their correlation of clustering is worse.This is possibly because they were influenced by strong biodegradation.The crude oil in Jurassic reservoir from well Tangcan1 may be from the source rocks in Lower Permian and/or Carboniferous.