Well-sorted quartz sandstones are generally not very abundant . 分选良好的石英沙岩一般并不十分丰富。
2.
Channel and point-bar sands may be clean and well-sorted . 河道砂和河曲沙坝砂可以是干净的和分选良好的。
3.
The cower unit of the eagle is a wellsorted lithic and glauconitic marine sandstone . 伊格尔砂岩的下部单元是分选良好的岩屑质和海相海绿石质。
4.
Better reservoirs are developed in lowstand systems tracts while better source beds and cap rocks are developed in transgressive and highstand systems tracts 低位体系域发育分选良好的储层，而水进体系域和高位体系域沉积则往往是良好的生油层和盖层。
