第四系是一个地质学名词，属年代地层单位。即新生代第四纪松散堆积物形成的地层。
Mapped the new quaternary tectonic map of four fault basin based on the data of shallow seismic profiles, drilling, and the redrawn fault system divided by the potential data processing, etc.
6、利用浅层地震剖面、钻井等资料,并参考重磁划分的断裂系,新编制了山西四个断陷盆地的第四系构造图。
参考来源 - 重磁位场新技术与山西断陷盆地构造识别划分研究·2,447,543篇论文数据，部分数据来源于NoteExpress
第四系地质对高频成分的吸收，使地震视频率大大降低。
The absorption of high-frequency composition by the Quaternary strata can greatly reduce seismic video frequency.
矿体赋存于第四系之下，矿化与构造活动及蚀变密切相关。
The orebody occurred below Quaternary, mineralization is closely related to tectonic activity and alteration.
初步确定三湖第四系生物气源岩的有机碳下限标准为0.25%。
The organic carbon minimum of the quaternary biogas source rock in Three-lake is 0.25%.
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