南堡凹陷沙三段烃源岩特征研究

Study on hydrocarbon source rock characteristics of Nanpu sag

沙三段是南堡凹陷沙河街组主要的烃源岩层之一,认清沙三段的烃源岩特征对于南堡凹陷研究具有重要意义.通过多种评价手段,对沙三段烃源岩有机质丰度、有机质类型和有机质热演化程度进行综合研究可知：林雀次凹有机碳含量最高;热解S1＋S2含量主要分布在0.01～75.69 mg/g之间;氯仿沥青“A”含量约为0.149％,总烃含量均值为1 100×10-6;有机质类型以Ⅱ2型为主;烃源岩镜质体反射率主要分布在0.25％～1.75％范围内;生烃高峰深度在4 000m左右.对南堡凹陷沙三段烃源岩特征的落实,为南堡凹陷油气成因的认识、油气的预测和下一步的勘探提供了参考.

As 3rd member of Shahejie formation is one of the main hydrocarbon source rocks in Shahejie formation,clear understanding of the characteristics of hydrocarbon source rocks is of great significance for Nanpu sag.With various evaluation methods,through comprehensive studies of organic matter abundance,organic matter type and thermal evolution degree of organic matter,organic carbon content in Linque sub-sag is the highest,S1+S2content in pyrolysis is between0.01~75.69 mg/g,chloroform bitumen ' A' content is about 0.149%,mean value of total hydrocarbon content is 1 100×10-6,organic matter type is given priority to Ⅱ2,vitrinite reflectance is mainly within the scope of 0.25% ~1.75%,and the hydrocarbon generation peak is about 4,000 m in depth.These clear hydrocarbon source rock characteristics provide reference for better understanding of hydrocarbon origins,the hydrocarbon prediction and further exploration of Nanpu sag.