摘要
为了解东海舟山北部海域海底第四系淡水资源赋存情况,本文在系统分析舟山北部海域地质钻孔和单道地震资料基础上,分析了研究海域海底第四纪地层结构与沉积环境,阐述了研究海域海底松散沉积物分布规律,探讨了上海陆地地区早更新世中、晚期和早期古河道在研究海域的延伸和分布状况,分析了研究海域海底第四系含水层赋存状况。研究海域第四系可供开发利用的主要含水层为早更新世中、晚期的第四承压含水层(Ⅳ)和早更新世早期的第五承压含水层(Ⅴ);第四承压含水层古河道分布区富水性最佳,含水层顶部发育厚层黏性土隔水层区域赋存淡水资源的可能性很大,含水层开发利用潜力可分为开发前景良好A区、开发前景较好B区和开发前景一般C区3类;第五承压含水层在古河道分布区富水性强,具有很好的淡水赋存潜力和良好的开发利用前景。
To comprehend occurrence potential condition of submarine Quaternary freshwater resources in north Zhoushan sea area,Quaternary stratigraphic texture and sedimentary environment are analyzed based on drilling cores and high-resolution single-channel seismic profiles.Regularities of distribution of submarine loose sediment are elaborated.Extension and distribution of paleo-channels in middle and late Early-Pleistocene and early EarlyPleistocene form Shanghai land area and occurrence status of submarine Quaternary aquifer in the study sea area are discussed.The main exploitable Quaternary aquifers are the 4 th confined aquifer in middle and late Early-Pleistocene and the 5 th confined aquifer in early Early-Pleistocene.The water-abundance in the area of paleo-channels in the 4 th confined aquifer is best,the confined aquifer with thick upper clay confining layer may be prone to reserving freshwater resources.The exploitable potential is classified into three types:better development prospect(type A),good development prospect(type B)and general development prospect(type C).The water-abundance in the area of paleo-channel in the 5 th confined aquifer is also good,in which the reserving capacity and prospect of development and utilization are favorable.
出处
《海洋学报》
CAS
CSCD
北大核心
2018年第3期50-61,共12页
基金
国家自然科学基金项目(41172228)
中国地质调查项目(1212010914044
121201005000150007)
关键词
第四系
海底古河道
淡水资源赋存潜力
舟山北部海域
Quaternary
submarine paleo-channels
occurrence potential of freshwater resources
north Zhoushan sea area