海洋地质前沿2025，Vol.41Issue(7)：76-88,13.DOI:10.16028/j.1009-2722.2024.120
东海盆地西湖凹陷平湖斜坡带典型井平湖组微量元素古环境差异及控制因素
Paleoenvironmental difference and controlling factor of trace elements in Pinghu Formation of typical wells in Pinghu Slope Belt of the Xihu Sag,East China Sea Basin
摘要
Abstract
Based on the geological background,the organic geochemical comprehensive evaluation on the source rocks in the study area was carried out,and the paleoenvironment of source rocks in the Pinghu Formation in the Xihu Sag were analyzed.The content and variation of trace elements in the three layers of the Pinghu Formation,the corresponding relationship between the paleosalinity,paleoredox conditions,and the paleoclimate during sedi-mentation were studied.Combined with the relationship between organic carbon content and elements,the pa-leoenvironment and controlling factors of the source rocks were clarified.Results show that ① all the sections of the Pinghu Formation contain coal,and the organic matter in the source rock is abundant in the types of Ⅱ2-Ⅲthat are in the mature-high mature stage and have good hydrocarbon generation potential.Meanwhile,the source rocks in the middle section of the Pinghu Formation are better than that in the upper and lower sections.② The water body was fresh to brackish water with local transgression due to oscillation of local water body.The overall paleoenvironment of Pinghu Formation was in oxidation-reduction.The paleoclimate was mainly warm-humid,and then changed gradually to warm-humid.③ The development of the source rocks was controlled by mainly pa-leoclimate and paleoproductivity as indicated by element ratio and organic carbon content analyses.The ancient warm and humid conditions favored the development of the source rocks,and the high paleoproductivity en-hanced the enrichment of organic matter in the middle section of Pinghu Formation.关键词
元素地球化学/古环境重建/烃源岩/西湖凹陷/东海Key words
elemental geochemistry/paleoenvironmental reconstruction/source rocks/Xihu Sag/East China Sea分类
海洋科学引用本文复制引用
张锡楠,王皖丽,黄启彰..东海盆地西湖凹陷平湖斜坡带典型井平湖组微量元素古环境差异及控制因素[J].海洋地质前沿,2025,41(7):76-88,13.基金项目
中海石油重大科技专项"东海西湖凹陷大中型气田勘探方向及关键技术研究"(KJZX-2023-0101) （KJZX-2023-0101）
