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通过分析龙永煤田早二叠世煤层分布规律、聚煤环境及其演化特征,认为该煤田的沉积体系为障壁岛-泻湖沉积组合、潮坪一潮道沉积组合和滨岸湖泊沉积组合,相应的成煤模式有障壁岛-泻湖、潮坪一潮道和滨岸湖泊3种主要成煤模式,形成了主要的可采煤层;对煤层形成的主要控制因素为基底沉降和沉积环境因素,其中基底沉降包括压实差异的影响,沉积环境包括海水进退和盆地水体深浅因素的影响。
By analyzing the distribution pattern of Early Permian coal seam and coal accumulation environment and its evolution characteristics in Longyong coalfield, it is concluded that the sedimentary system of this coalfield is Barrier Island - Lagoon sedimentary assemblage, Tidal Flat - Tidal Channel sedimentary assemblage and coastal lake sedimentary assemblage, correspondingly The main coal seam formation is dominated by sedimentation and depositional environmental factors, and the main coal seam formation is dominated by subsidence and depositional environment, The basement subsidence includes the influence of compaction difference, and the sedimentary environment includes the influence of seawater advance and retreat and basin water depth.