松辽盆地三肇凹陷青山口组一段泥页岩岩石学特征及岩相划分——以松页油3井为例

以松辽盆地三肇凹陷松页油3井青山口组一段泥页岩为例,对其沉积构造、有机质丰度及矿物组成等岩石学特征关系进行研究.结果表明,三肇凹陷青一段泥页岩发育块状构造和纹层状构造两种沉积构造;TOC含量介于0.50％～6.82％,平均值为3.16％,S1+S2介于2.01×10-3～49.41×10-3,平均值为23.02×10-...

PETROLOGY AND LITHOFACIES OF SHALE FROM THE FIRST MEMBER OF QINGSHANKOU FORMATION IN SANZHAO SAG,SONGLIAO BASIN: A Case Study of SYY-3 Well

Taking the shale from the first member of Qingshankou Formation in SYY-3 well of Sanzhao sag in Songliao Basin as an example, the paper studies the petrological characteristics, including sedimentary structure, organic matter abundance and mineral composition. The results show that the shale develops massive structure and laminated structure are, with TOC of 0.50%-6.82% (averagely 3.16%) and S₁+S₂ of 2.01×10^-3-49.41×10^-3 (averagely 23.02×10^-3), generally belonging to good-best source rock. The mineral composition is mainly felsic mineral, followed by clay, with low content of carbonate and pyrite. Based on the petrological characteristics, the first member of Qingshankou Formation can be divided into 9 types of lithofacies by the classification criteria of organic matter abundance-sedimentary structure-mineral composition, among which the laminated felsic shale with high TOC has good hydrocarbon generation potential, serving as the most favorable lithofacies for shale oil exploration in Sanzhao sag.