systems tracts的用法和樣例：
例句
- Therefore, hydrocarbon source rocks formed in the early highstand system tract have the best hydrocarbon potential.
因此早期高位體系域中的烴源巖有較好的生烴潛力。 - Better reservoirs are developed in Lowstand systems tracts while better source beds and cap rocks are developed in Transgressive and Highstand systems tracts.
低位體系域發(fā)育分選良好的儲層，而水進(jìn)體系域和高位體系域沉積則往往是良好的生油層和蓋層。
