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黑龙江依兰盆地是我国典型的煤与油页岩共生盆地,通过对盆地古近系达连河组层序地层格架下煤与油页岩共生特征进行研究,识别出四种煤与油页岩共生组合,即煤层/油页岩/煤层组合、油页岩/煤层/油页岩组合、油页岩/其它沉积/煤层组合及油页岩/煤层组合。将达连河组划分为一个三级层序,其内部可以识别出4个体系域:低水位体系域(LST)沉积期,在地势低洼处发育厚度不大、分布局限的油页岩,向隆起区尖灭;湖扩张体系域(EST)沉积期,4种煤与油页岩共生组合均有发育;湖扩张体系域从早期到晚期、从滨湖到湖中心,共生组合中煤层厚度逐渐减小,油页岩厚度逐渐增大;早期高水位体系域(EHST)沉积期,主要发育厚度巨大、分布稳定的油页岩;晚期高水位体系域(LHST)不发育煤层和油页岩。可容空间增加速率与沉积物堆积速率的相关关系控制了煤、油页岩的发育和相互转换。
The Yilan Basin in Heilongjiang is a typical symbiotic basin of coal and oil shale in China. By studying the symbiosis of coal and oil shale under the sequence stratigraphic framework of the Daruianhe Formation in the Paleogene of the basin, four coal and oil shale Rock symbiosis, namely coal seam / oil shale / coal seam combination, oil shale / coal seam / oil shale combination, oil shale / other sedimentary / coal seam combination and oil shale / coal seam combination. The Darunhe Formation is divided into a tertiary sequence, which can identify four systematic domains: LST, sedimentary period, low-lying oil shale with limited distribution in the low-lying terrain, The uplifted area is extinct, the expanse of the expansive system domain (EST) is deposited, the symbiotic assemblages of four types of coal and oil shale are all developed, and from the early to the late stage, from the lakeside to the lake center, the thickness of the coal seam in the symbiotic assemblage gradually increases And the thickness of oil shale is gradually increasing. In the early EHST deposition period, oil shale with large thickness and stable distribution is mainly developed, while the late high water mark system tract (LHST) does not develop coal seam and oil shale. The correlation between the rate of increase of space and deposition rate of sediments controls the development and interconversion of coal and oil shale.