上部扇 meaning in Chinese

upper fan

The further study on the fan is very important for the future explorition . the fan delta front around the well tiel6 is worse than the bottom shahejie formation ' s fan . the reservior ' s quality in the dawan area is relatively bad
而沙三下的上部扇三角洲与其下部的浊积扇砂体也是一套非常有利的储层，加强该扇体的研究对今后的油气勘探十分重要；其次为铁16井附近扇三角洲前缘沉积；而大湾地区储层相对较差。