Abstract: The Dalianhe oil shale mine lies in the 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 transgression and highstand systems tract, and were developed in subdeep lacustrine environments. The oil shales are associated with and lie on a coal layer of turfyswampy facies. Their oil yield is between 3.75% and 8.37%. This high quality oil shales are of better exploitation value. Bad lacustrine oil shales were developed on the upper part of coal layers with extensive extension and stable horizon and their oil yield is less than 3.5%. The genetic types of oil shales in the area under research are of humus and mixed type. According to the industrial division criterion of the oil shale, the oil shales of the Dalianhe Formation belonged to the middle oil yield with lowash.

Key words: oil shale, Dalianhe Formation of Paleogene, oil shale character, sedimentary environment, sedimentary mode