湖积平原指由湖泊堆积作用形成的平原。河流注入湖泊挟带大量泥沙，使湖底抬高；湖内水生生物残体也在湖内大量堆积，遂使湖盆缩小、变浅、填平、干涸形成湖积平原。如中国湖南的洞庭湖湖滨平原、江苏的太湖平原。
嘉兴地区为典型的湖积平原，第四系地层具有多个明显“软-硬”交替的沉积旋回。
Jiaxing area belongs to representative lacustrine plain zone. Its Quaternary period stratum has several evident sediment cycles "soft to hard".
二是上三叠系延长组三角洲油气区，主要位于盆地东部，具有湖相三角洲前积砂体和平原分流河道砂体两种油、气藏序列。
Triassic Yanchang deltaic oil-gas located in east of basin with two kinds of oil-gas reservoir sequence, the lacustrine facies delta foreset sand body and plain distributary sand body.
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