The short-term base-level cycle of these six kinds of sandbody were compartmentalized to 3 kinds and 6 sub-kinds by using short-term base-leve.

• 利用短期基准面旋回原理将这六种砂体的短期基准面旋回划分三大类六亚类,并对每一亚类砂体成因进行了分析。