川西地区白马庙气田侏罗系的天然气，以往大都认为是来自上三叠统煤系地层，但对具体来源于上三叠统哪一个层位却存在较大的分歧。
Most of people considered that the natural gas in Jurassic in Baimamiao gas field in West Sichuan Basin came from the coal measure strata of Upper Triassic in the past.
以四川盆地西部上三叠统须家河组的砂岩组分为基础，详细分析该期研究区古地理的演化。
Based on the sandstone compositions analysis of the Upper Triassic Xujiahe Formation in Western Sichuan Basin, the authors tried to discuss the paleogeographic evolution of the study area.
三角洲两侧的大鹏湾、大亚湾及上、下川岛建设地方中心深水港和专用深水港；
Secondly, the Yamen waterway can be exploited to build central and special- purpose ports for the west part of the delta area.
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