The Characteristics, Genetics And Resources Potential Of Oil Shale In Dalianhe Mining Area Of Yilan, Heilongjiang

Dalianhe Mining Area of Yilan, Heilongjiang province is at the risk of coal resources exhaustion. To explore and exploit oil shale resources in this area, this research is on the evalution of its characteristics, genetics and potential from several aspects with relevant theories on basin analysis, sequence stratigraphy, sedimentology, geochemistry, organic petrology, palaeontology and industry evaluation technologies and incorporated with the data on regional geology, coring and logging. The goal is to study and resolve the science issues.This study discovers and confirms that oil shale exists on the seam top, which is based on the establishment of sequence stratigraphic framework and research on the sequence system and distributuion pattern of sediment system.The parent material of oil shale in this area gives priority to terrigenous higher plants with the input of some lower plants algae and bacteria mostly from peat swamps. The result is good source rocks comprehensively in the premature and mature stages. The middle and lower parts of oil shale among coal beddings have high organic abundance and mainly I and II type in weak oxidate and reduced fresh lake and marsh deposition environment, the top part are primarily II1 and II2 type in fresh water and brackish deep lake deposition environment.The geochemistry features display that the rare earth elements have similar distribution patterns in different layers with relatively rich LREE and hungry HREE and they don't come to the production grade. Eu is in negative anomaly andδCe indistinctive anomaly with the criterion of chondrite.Oil shale in middle and lower parts can utilize to extract oil with low temperature distillation as fuels with low heat value. The top part can't extract oil now but fit for apyrous clay or kaoline material preparation, however, the concentrated layers can use as fuels with low heat value. The dust is fit for building materials and clay raw material in cement production. The middle and lower parts of oil shale has higher iron that needs to remove. The unitized production ofextraction oil, chemistry, thermal electricity and construction is adopted in the overall development of oil shale.The research confirms that the global cooldown climiate in Eocene appeared in this area and firstly finds out there was large palaeoclimate fluctuation in the deposit stage of oil shale. It affects the oil-bearing rate of oil shale because the hotter and colder climates arised alternately.It also proposes some concepts: oil shale abundance zone, locus of concentration, rich oil belt and studies the distribution regularities of abundance zones and belts in middle and lower parts of oil shale in mining area. The research presents three types of oil shale accumulation in faulted basin, builds two mineralization patterns, summerizes the regularity and evaluates the resource potential comprehensively which amounts to 456 million tons of oil shale and shale oil 29 million tons. The favorable place for prospecting is adjacant area of southwest prospecting boundary and the area of interest is Shahezi Area.