The results show that the mineral comparative maturity of sandstones increases with the distance from the fan-delta plain to the fan-delta front;

分析表明：从扇三角洲平原到扇三角洲前缘，矿物成分成熟度呈现递增的趋势，河口坝微相的长石砂岩最为发育；

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The general sedimentary characteristics indicate that shore-shallow lacustrine deposits are the main types, while flood plain, delta and fan delta occurred mainly along the basin margin.

沉积相总体特征以滨浅湖沉积为主，而在研究区周缘则多发育河流泛滥平原、三角洲和扇三角洲沉积。

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Fan delta sedimentary system which includes delta plain facies and delta front facies developed in the lower member of Xishanyao Formation.

西山窑组下段为扇三角洲沉积体系，发育平原和前缘亚相。

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