杭州湾北岸滨海平原浅层气分布研究  

A Study on the Distribution of Shallow Gas in the Coastal Plain on the North Coast of Hangzhou Bay

作　　者：侯文学 HOU Wenxue(China Railway Shanghai Design Institute Group Corporation Limited,Shanghai 200040)

机构地区：[1]中铁上海设计院集团有限公司,上海200040

出　　处：《现代工程科技》2023年第1期81-84,共4页Modern Engineering Technology

摘　　要：某工程位于杭嘉湖平原的杭州湾北部,在勘察过程中发现部分孔揭露浅层气。为了查明浅层气的分布范围和埋藏深度,通过收集老地形地貌图,结合现场勘察成果,初步分析浅层气形成原因,圈定浅层气分布范围,然后现场通过补充勘探查明浅层气的产气层与储气层,并总结浅层气分布特点,得出浅层气分布于第四系全新世(淤泥质)黏性土与晚更新世砂粉性土的交界处,现场进行浅层气观测、气压测量、收集化验等判定浅层气气压大小、成分,分析浅层气施工危害,提出解决措施。A certain project is located in the northern part of Hangzhou Bay in the Hangjiahu Plain.During the survey process,it was discovered that some boreholes exposed shallow gas.In order to identify the distribution range and burial depth of shallow gas,by collecting old topographic maps combined with on-site survey results,the causes of shallow gas formation were preliminarily analyzed,and the distribution range of shallow gas was delineated.Then,through supplementary exploration on site,shallow gas production and reservoir layers were identified,and the distribution characteristics of shallow gas were summarized.It is concluded that the shallow gas is distributed at the junction of Quaternary Holocene(muddy)clay soil and Late Pleistocene sandy silt soil.The field shallow gas observation,pressure measurement,collection and testing are carried out to determine the size and composition of shallow gas pressure,analyze the hazards of shallow gas construction,and propose solutions.

关 键 词：杭嘉湖平原 浅层气 储气层 产气层 

分 类 号：TU413[建筑科学—岩土工程]