The early Middle Jurassic was an major coal-forming period in the region, when the Lower Yaopo Formation of lacustrine-deltaic and swamp facies was deposited.
中侏罗世早期是全区重要的成煤期，下窑坡组为湖泊—三角洲及沼泽相。
In terms of molecular geochemistry indexes, the hydrocarbon source rocks both in lower Jurassic and middle Jurassic can be classified as lake facies and swamp facies.
根据分子地球化学指标，下侏罗统和中侏罗统烃源岩都可划分为湖相和沼泽相两类。
Sediments in basins consist of grey coal-bearing formation composed of fluvial alluvial, proluvial fac ies, lacustrine-swamp facies. The material composition of sedim…
沉积物组成了山区河流冲洪积相、湖沼相的灰色含煤建造，其物质成分与基底岩石具明显继承性。
The sedimentary facies can be classified into alluvial fan, fan delta, lake, stream and swamp.
沉积相可分冲积扇相、扇三角洲相、湖泊相、河流相和沼泽相。
The sedimentary facies mainly consists of 5 types, such as meandering river, braided river, braided river delta, lake and swamp lake.
沉积相类型主要为曲流河、辫状河、辫状三角洲、湖泊、沼泽化湖泊等5种。
The high-stand swamp organic facies just appears in the edge of the basin, and its hydrocarbon generation capacity is the lowest.
高位沼泽有机相由于处于盆地边缘，对生烃贡献不大。
The high-stand swamp organic facies just appears in the edge of the basin, and its hydrocarbon generation capacity is the lowest.
高位沼泽有机相由于处于盆地边缘，对生烃贡献不大。
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