地质学报2025，Vol.99Issue(4)：1353-1368,16.DOI:10.19762/j.cnki.dizhixuebao.2024007
局限环境下水体深度对有机质富集的控制作用
The control of water depth on organic matter enrichment in confined environment
摘要
Abstract
The prevailing paradigm in organic-rich shale development posits a strong association with deep anoxic environments.This view suggests that the deeper parts of deep-to-semi-deep lakes,located in the basin's sedimentary subsidence centers,provide the anoxic reducing conditions conducive to the formation of high-quality source rocks.However,observations of organic matter enrichment in modern water bodies challenge this established notion,underscoring the need for a comprehensive examination of the relationship between water depth and organic matter accumulation.To address this,the present study integrates data on dissolved oxygen distribution in water bodies and organic matter content in surface sediments of modern lakes,drawing from environmental and ecological sciences,to investigate the enrichment characteristics of organic matter at different depths in enclosed water bodies.The results demonstrate that dissolved oxygen concentrations in water bodies increase with depth,indicating that the bottom layers of lakes and seas are,in most cases,oxygen-rich environments.Deeper water bodies exhibit lower primary productivity and are not necessarily characterized by low-energy or anoxic conditions,which are less conducive to the preservation of organic matter.In contrast,relatively enclosed environments,such as lagoons,bays,and lake bays,serve as more effective depositional settings for the accumulation of organic matter,minerals,volcanic ash,and other materials.This study concludes that in smaller enclosed to semi-enclosed water bodies,shallower depths are more favorable for the enrichment of organic matter.Furthermore,the contribution of exogenous organic matter cannot be ignored,as it plays a significant role in the overall enrichment process.Conversely,open water bodies,such as deep continental shelves and larger deep-to-semi-deep lakes,lack the necessary conditions for the development of high-quality source rocks.关键词
溶解氧/页岩/氧化还原条件/大洋缺氧事件/沉积环境Key words
dissolved oxygen/shale/oxidation-reduction conditions/oceanic hypoxia event/sedimentary environment引用本文复制引用
毛小平,陈修蓉,李书现,杨帆,李振,李学慧,杨岳兴..局限环境下水体深度对有机质富集的控制作用[J].地质学报,2025,99(4):1353-1368,16.基金项目
本文为国家能源碳酸盐岩油气重点实验室开放基金(编号33550000-24-ZC0613-0105)和贵州省战略矿产智慧勘查重点实验室联合资助的成果. （编号33550000-24-ZC0613-0105）
