The permian in Huainan coalfield is a set of deltaic coastal deposition.
Abundant in natural gas sources, Jurassic Shaximiao Formation in west Sichuan Basin is a red sandstone and shale mainly deposited in fluvial, deltaic shoal faces.
Based on the principle of hierarchical analysis, the deltaic front is divided into 5 hierarchies, for which the rock types, its distributional characteristic for each interface are analyzed.
The weight of a deltaic pile of sediment may be so great as to depress the earth's crust, thus forming a moat around the depocentre.
The favourable reservoir sandstones in these gas pools may broadly be assigned to the deltaic front channel mouth bar, deltaic plain distributary channel bar and fluvial channel bar microfacies.
The Rongxi Formation was deltaic plain which includes branched channels and marsh.
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