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延吉盆地为中生代断陷盆地。根据20口岩心及测井资料分析,延吉盆地铜佛寺组主要发育扇三角洲相和湖泊相2种沉积相类型,暗色泥岩厚度达20~500m。基于对700余块铜佛寺组暗色泥岩样品的有机碳、氯仿沥青“A”、生烃潜量、有机质类型的测试数据,确定出铜佛寺组一段、二段、三段都发育有较高有机质丰度的烃源岩,有机质类型以Ⅱ型为主。90块暗色泥岩的RO值测试数据表明,铜佛寺组暗色泥岩除德新凹陷铜佛寺组三段部分样品未达到生油门限外,其余都处于开始生烃的低熟—成熟阶段。综合各种测试分析数据,认为延吉盆地除了德新凹陷铜佛寺组三段为低熟烃源岩之外,铜佛寺组暗色泥岩均为成熟良好的有效烃源岩。综合烃源岩特征及有效烃源岩分布等,认为延吉盆地具有良好的油气资源潜力,并依据油气显示(产量)、沉积相、圈闭类型等5个评价参数,优选出延吉盆地Y13井—Y20井区、延10井—延12井区、Y1井—Y3井区为勘探开发有利区。
The Yanji Basin is a Cenozoic fault basin. According to the analysis of 20 core and well logging data, the Tongfosi Formation in Yanji Basin mainly develops two facies types of fan delta facies and lacustrine facies, and the dark mudstone has a thickness of 20-500 m. Based on the measured data of organic carbon, chloroformic bitumen “A ”, hydrocarbon generating potential and organic type of the dark mudstone sample from more than 700 Tongfosi Formation, it is determined that the development of the first, second and third stages of the copper Buddha temple group High organic matter abundance of source rocks, the type of organic matter to type Ⅱ. The data of RO values of 90 dark mudstones show that some samples of the third member of the Neo-Depression of the Copper Foosi Formation of the Neo-Depression of the Tongfosi Formation did not reach the oil production threshold, and the rest were in the low-maturity stage of hydrocarbon generation. Based on various test and analysis data, it is concluded that except for the low-maturity source rocks in the third part of the Tongfosi Formation in the Dexin depression, the dark mudstone in the Tongfosi Formation is well-established and effective source rock. According to the characteristics of hydrocarbon source rocks and the distribution of available source rocks, the Yanji Basin is considered to have good potential for oil and gas resources. According to the five evaluation parameters such as oil and gas (sediment yield), sedimentary facies, and trap types, Y20 well area, Yan 10 well - Yan 12 well area, well Y1-Y3 well for exploration and development of favorable areas.