琼东南盆地第四系物源及对天然气水合物勘探的启示
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本文为海南省科技专项(编号ZDYF2023GXJS008)和湛江市科技项目(编号2022A01061)联合资助的成果


Sources of the Quaternary sediments and implications for gas hydrate exploration in the Qiongdongnan basin
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    摘要:

    琼东南盆地被认为具有较好的天然气水合物资源潜力,第四系是水合物主要赋存层,但对第四系沉积物的物源演化却少有研究。本文基于琼东南盆地8口钻井所揭示的第四系沉积物重矿物和地球化学数据,结合数理统计分析方法,讨论了第四系沉积物的物源、物源迁移路径以及对水合物勘探的指示意义。研究表明,琼东南盆地第四纪时期主要接收红河、莺西和海南岛物源,不同区域物源贡献有明显差异。北部坳陷区以赤褐铁矿、钛铁矿、锆石、磁铁矿为特征矿物,主要受海南岛物源影响,海南岛物源存在受重力影响的垂向和受洋流控制由东向西的物源迁移路径。莺琼结合区受红河和海南岛物源共同作用,越靠近琼东南盆地,沉积物受海南岛物源作用越强。中央坳陷区同时接收三大物源补给,以莺西物源贡献为主,莺西物源自西向东混合海南岛和红河物源后,共同补给到中央坳陷。此外,中央凹陷区存在重晶石和黄铁矿等天然气水合物特征自生矿物异常,推断陵水凹陷东南部为水合物有利勘探区,尤其是LS6井附近;在乐东凹陷东南部下伏地层中天然气藏发育的潜力较大。

    Abstract:

    Qiongdongnan basin is recognized for its promising natural gas hydrate (NGH) resource potential, with Quaternary strata serving as the primary NGH occurrence horizon. However, the provenance evolution of these Quaternary sediments remains poorly understood. This study investigates the source and migration pathways of these Quaternary sediments in the Qiongdongnan basin and their implications for hydrate exploration. Using heavy mineral and geochemical data from 8 wells, combined with mathematical statistical analysis, we reveal the provenance contributions to the basin during the Quaternary period. The Red River, Yingxi, and Hainan Island are identified as the primary sediment sources, and provenance contributions vary across different basin regions. The northern depression area is characterized by hematite, limonite, ilmenite, zircon, and magnetite, primarily sourced from Hainan Island. The provenance exhibits a vertical migration path driven by gravity and an eastward migration path influenced by ocean currents.Sediments in the Yingqiong Junction area are influenced by both Red River and Hainan Island provenance, with the latter' s influence increasing closer to the Qiongdongnan basin. The central depression receives a mixed sediment supply from all three provenance regions, mainly from Yingxi. The provenance of Yingxi migrated westward, mixing with Hainan Island and Red River sediments before being re- supplied to the central depression. In addition, characteristic authigenic mineral anomalies associated with NGH, such as barite and pyrite, are observed in the sediments of the central sag. This suggests that the southeastern Lingshui sag is a favorable exploration area for hydrates, especially near the LS6 well. Moreover, the underbed southeast of the Ledong depression there exhibits significant potential for natural gas development.

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熊鹏飞,方小宇,汪贵锋,杨佳蔚,陆江,王子雯,杨浦,姜涛.2025.琼东南盆地第四系物源及对天然气水合物勘探的启示[J].地质学报,99(4):1398-1408.
XIONG Pengfei, FANG Xiaoyu, WANG Guifeng, YANG Jiawei, LU Jiang, WANG Ziwen, YANG Pu, JIANG Tao.2025. Sources of the Quaternary sediments and implications for gas hydrate exploration in the Qiongdongnan basin[J]. Acta Geologica Sinica,99(4):1398-1408.

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  • 在线发布日期: 2025-04-27