Ore-forming models and types of oil shale in Dalianhe Formation of Yilan Basin

Abstract: The Dalianhe oil shale ore district lies in Yilan area of Heilongjiang Province, which is a half-graben faulted basin．The Paleogene Dalianhe Formation makes up a complete succession of the 3rd order． The oil shales were developed during the evolution of transgression and highstand systems tract. Two ore-forming models of Dalianhe oil shales were recognized in this paper, namely lake-swampy facies and sub-deep lacustrine facies. Oil shales of different oil shale reservoir accumulations are distributed in different system tracts.