Development model of shallow lithologic traps and natural gas accumulation mechanisms in marine deep-water areas: A case study in the qiongdongnan basin, south China sea
文献类型：期刊论文
| 作者 | Liu, Kun4; Cheng, Peng2,3; Tian, Hui2,3; Song, Peng1; Hu, Wenyan1 |
| 刊名 | MARINE AND PETROLEUM GEOLOGY
 |
| 出版日期 | 2023 |
| 卷号 | 151页码:106211 |
| 关键词 | SUBMARINE-CANYON CONTINENTAL-MARGIN METHANE HYDRATE SYSTEM EVOLUTION FIELD GEOCHEMISTRY ARCHITECTURE GENERATION |
| ISSN号 | 0264-8172 |
| DOI | 10.1016/j.marpetgeo.2023.106211 |
| 英文摘要 | Although hydrocarbon gases are widely distributed in the shallow strata of marine deep-water areas, it is generally believed that these shallow gases have little potential to form large gas accumulations due to unfavorable conditions, especially for effective trap development. Based on a comprehensive analysis of the latest geological exploration data of the deep-water areas of the Qiongdongnan Basin, this study reports a large lithologic trap that developed in the shallow Ledong Formation with burial depths of 200–600 m below the seafloor (mbsf). Systematically, this work investigates the development model of the trap and its gas accumulation mechanism. The results indicate that during the Pleistocene, sediment mainly from the southern Kunsong Uplift was transported to the Qiongdongnan Basin due to confined canyon geomorphology and developed a large channelized submarine fan in the deep-water areas. The roof of the submarine fan was cut and eroded and laterally sealed by overlying muddy channels, resulting in a dome-shaped structure, which was further covered by the Pleistocene tight mudstones forming the Ledong lithologic trap. The Yacheng coal-measure source rocks in the deep-water areas had high gas yields, which resulted in increased pressures and promoted deep gas migration into shallow reservoirs along a combined migration pathway including sand strata, structural ridges, faults, fissures, and gas chimneys. The gas accumulated in the Ledong trap as a result of the decreases in temperature and pressure. After the deep gases charged the Ledong strata, migration was blocked by the overburden consisting of Pleistocene tight mudstones, whose seal capacity was significantly enhanced by overlying gas hydrates in the deep-water areas. Meanwhile, the seawater in deep-water areas compacts the underlying cap rocks through its own weight, which enhances the seal capacity of cap rocks. In shallow reservoirs, thermogenic gases may mix with microbial gases from shallow marine source rocks, and some thermogenic gases may be reformed by microorganisms to form secondary microbial gases. The shallow Ledong gas reservoir connects the underlying gas reservoirs and the overlying gas hydrate reservoirs and vertically consists of a continuous hydrocarbon enrichment zone, which significantly expands exploration targets in the deep-water areas of the Qiongdongnan Basin. Additionally, the development model of the shallow Ledong lithologic trap and its gas accumulation mechanism may have general significance for hydrocarbon exploration in marine deep-water areas worldwide. ? 2023 Elsevier Ltd |
| WOS研究方向 | Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000962043500001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80201]  |
| 专题 | 有机地球化学国家重点实验室 |
| 作者单位 | 1.CNOOC, Hainan Branch, Haikou; 570312, China 2.CAS Center for Excellence in Deep Earth Science, Guangzhou; 510640, China 3.State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou; 510640, China 4.CNOOC, Zhanjiang Branch, Zhanjiang; 524057, China |
| 推荐引用方式 GB/T 7714 | Liu, Kun,Cheng, Peng,Tian, Hui,et al. Development model of shallow lithologic traps and natural gas accumulation mechanisms in marine deep-water areas: A case study in the qiongdongnan basin, south China sea[J]. MARINE AND PETROLEUM GEOLOGY,2023,151:106211. |
| APA | Liu, Kun,Cheng, Peng,Tian, Hui,Song, Peng,&Hu, Wenyan.(2023).Development model of shallow lithologic traps and natural gas accumulation mechanisms in marine deep-water areas: A case study in the qiongdongnan basin, south China sea.MARINE AND PETROLEUM GEOLOGY,151,106211. |
| MLA | Liu, Kun,et al."Development model of shallow lithologic traps and natural gas accumulation mechanisms in marine deep-water areas: A case study in the qiongdongnan basin, south China sea".MARINE AND PETROLEUM GEOLOGY 151(2023):106211. |
入库方式： OAI收割
来源：广州地球化学研究所
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