Multiple Influences of Paleogeography, Sequence Stratigraphy, and Fold Structure on Coalbed Methane Accumulation in the Lopingian (Late Permian) of Junlian Coalfield, SW China

Table 2

Main depositional systems of the Lopingian coal-bearing rock system in southern Sichuan.

Facies associations	Subfacies	Environments	Lithofacies
Fluvial plain (meandering)	Fluvial channel	Channel lags	1, 2, 3, 5
		Point bar
	Overbank	Levee	9, 10
		Crevasse splay
	Flood basin	Backswamp	9, 11, 17, 20
		Peat swamp
Shallow-water delta	Upper delta plain	Distributary channel; Distributary channel levee Crevasse splay; Interdistributary bay; Peat swamp	2, 3, 4, 5, 6, 9, 12, 13
	Lower delta plain	Distributary channel; Distributary channel levee; Crevasse splay; Interdistributary bay; Peat swamp	2, 4, 6, 7, 8, 9, 12, 13
	Delta front	Mouth bar	2, 3, 4, 5, 12
		Distal bar
Tidal flat-lagoon	Tidal flat	Sandy flat	6, 7, 8, 10, 11, 15, 17, 20
		Mixed flat
		Muddy flat
		Tidal channel
		Peat swamp
	Lagoon	Lagoon	11, 13, 14, 16, 17, 20
		Peat swamp