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在研究了西北侏罗系含煤盆地的层序地层、煤相类型组合和煤沼剖面上的演化特征的基础上，提出了煤沼沉积环境演化类型（简称演化类型）的概念．根据含煤建造（组）垂向上的变化特征、煤相类型及其组合特征，将其划分出三种演化类型．着重讨论了第三演化类型盆地的煤生油显微组分组成、泥岩厚度、水进和水退序列中有机岩生油特征、煤沼在剖面上的演化特征和煤（系）成油田的形成原因，在此基础上，得出了只有在第三演化类型中才能找到煤（系）成油田的结论．
Based on the study of the sequence stratigraphy, coal-facies assemblage and coal-marsh profile evolution of the North Jurassic coal-bearing basin, the concept of evolutionary type of coal-marsh sedimentary environment (referred to as evolutionary type) is proposed. According to vertical variation of coal-bearing construction (group), coal type and its combination characteristics, it is divided into three types of evolution. This paper focuses on the microscopic composition of coal derived oil, the thickness of mudstone, the characteristics of organic oil generation in the sequence of water inflow and outflow, the evolution characteristics of coal mines in the section and the formation of coal (oil) formation in the third evolutionary basins On this basis, we conclude that coal can be found only in the third evolutionary type.