延长小河东部油区长7段烃源岩特征研究

Study on source rock characteristics of Chang 7 member in eastern Xiaohe oil region of Yanchang Petroleum Company

小河东部油区长7段发育良好烃源岩,为推进该地区石油勘探,需要深化该地区烃源岩认识。通过岩石热解、总有机碳、镜质体反射率等方法,研究了该地区烃源岩特征。结果表明,小河东部油区长7段有机质丰度总体上为好的生油岩类型,泥岩样品TOC变化范围是3%~5%,样品生烃潜量S_1+S_2含量主体分布在5~15mg/g,平均含量为13.8mg/g。有机质类型为Ⅰ-Ⅱ_1型,研究区长7段有机质总体上为成熟。该烃源岩生排烃为该地区内石油聚集成藏提供了物质基础。

The Chang7 section in the eastern oil region of Xiaohe has well-developed source rocks.In order to promote oil exploration in this area,it is necessary to deepen the understanding of source rocks in this area.This article studies the characteristics of source rocks in the region through methods such as rock pyrolysis,total organic carbon,and vitrinite reflectance.The results show that the organic matter abundance of the Chang 7 section in the eastern oil region of Xiaohe is generally a good type of source rock.The TOC variation range of mudstone samples is 3%~5%,and the hydrocarbon generation potential S1+S2 content of the samples is mainly distributed between 5~15mg/g,with an average content of 13.8mg/g.The organic matter type is type I-II1,and the organic matter in the study area is generally mature in 7 segments.The generation and expulsion of hydrocarbons from this source rock provide a material basis for the accumulation and accumulation of oil in the region.