松辽盆地上白垩统油页岩特征及沉积环境分析

Characteristics and Sedimentary Environment of Oil Shale in the Upper Cretaceous of Songliao Basin

利用高分辨率层序地层学原理,结合松辽盆地取心和录井资料,对松辽盆地上白垩统油页岩的基本特征及沉积环境进行了研究,指出松辽盆地油页岩主要赋存于上白垩统青山口组一段和嫩江组一、二段,含油率中等,质量较好,处于低-成熟阶段。松辽盆地油页岩形成于温暖潮湿的微咸化-半咸化水体中,半深湖-深湖相是其发育的有利相带,水进体系域是其发育的主要阶段,大规模的海侵事件和缺氧事件为该区生物发育和有机质的保存提供了有利的保存条件。

Based on high-resolution sequence stratigraphy and in combination with the coring and log data from Songliao Basin,the characteristics and sedimentary environment of oil shale in the Upper Cretaceous of Songliao Basin were studied. It was pointed out that the oil shale of Songliao Basin was mainly existed in the 1st member of the Upper Cretaceous Qingshankou Formation and the 1st,2nd members of the Upper Cretaceous Nenjiang Formation. The oil shale in the area is good in quality and is at low mature stage. During the sedimentary of the oil shale,the palaeo-climate is humid-warm,the lake water is brackish. The deep lake-half deep lake acies is the most beneficial facies belt for the development of the oil shale formation,and the major stage of depositing oil shale is transgressive system .Large-scale marine aggression and oxygen-deficient events of the Late Cretaceous provides a good condition for the development of biology and the preservation of the organic matter in the oil shale.