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The Zhujiang River Mouth Basin is a petroleum-bearing basin with a high degree of exploration in the northern continental margin of the South China Sea, the analysis of fault characteristics is crucial to its basin evolution model and hydrocarbon accumulation mechanism. According to the high-resolution seismic data and drilling data, the fine seismic geological interpretation of the Kaiping Sag in the southwest of the basin is carried out. Based on the fault grade and scale, the fault structure type is divided into the first-level basin-controlled fault, the second-level sag-controlled fault and the third-level control fault based on the level and scale of faults belt fracture and four-level control ring fracture, identify “Y” shaped faults, stepped faults, and heart-shaped faults combination styles on the seismic section, identify three plane combinations of parallel, goose, and oblique based on the fault plane distribution Types of quantitative statistics of the fault strike characteristics show that under the action of the right-handed stress field, from the Eocene to the Early Miocene, the strike direction continued to rotate clockwise in the direction of NE→EW→NW, and the fracture activity gradually weakened. It is also believed that due to the impact of the Indian-Eurasian plate collision, the subduction and retreat of the Pacific plate and the continuous southward movement of the ancient South China Sea, the Zhujiang River Mouth Basin formes a typical extensional tensile stress field environment. It contributes to the development of three groups of faults in the near NE direction, the EW direction and the near-NW direction during the Eocene-Oligocene period. It provides an explanation and supplement to the geological structural characteristics of Kaiping Sag, and provides a reference for the development characteristics and genetic mechanism of the ocean-continent transition zone on the northern margin of the South China Sea.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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