Full
CHEN Jinyang,born in 1999,is a master degree candidate. He is mainly engaged in research on oil and gas field development geology. E-mail: 1729789179@qq.com.
Outline
Slope microbasin is an important sedimentary site of deep-sea fan,which has huge oil and gas resources and research value,but the research of deep-water sedimentary system in microbasin is relatively weak. Therefore,this paper takes a mud diapir micro-basin in the continental slope area of Niger Delta basin in West Africa as the research object. Based on shallow 3D seismic data and RGB frequency division attribute fusion technology,this paper analyzes the structural characteristics of the deep-water sedimentary system in the microbasin,and reveals the relevant evolutionary control factors and formation process. The results show that the deep-water sedimentary system in the microbasin develops in the sequence of Mass-transport deposition,submarine channel deposition and submarine lobe deposition,in which the submarine lobe occupies the dominant position in the microbasin deposition. By using seismic section and plane RGB frequency division attribute analysis,the lobes developed in the microbasin were divided into two hierarchical orders: composite lobe and single lobe. At different stages,single lobe exhibits has two stack patterns in radial direction,which are progradation and retrogradation,and lateral migration in transverse direction. The distribution and stack patterns of these sedimentary units reflect the influence of the initial topography of the micro basin and the fluctuation of the early sedimentary bodies on the late sedimentary logistics. In addition,the evolution of the depositional system in the micro basin has mainly gone through four stages: the filling of the original topography by the initial sediments,the regulation and restriction of the topography and geomorphology on the sedimentary flow,the compensation and superposition of secondary lobes in different stages,and the channel erosion after the filling of the micro basin. The single lobe superimposed stack pattern in different stages and sedimentary evolution stages have a great impact on the physical properties and connectivity of deep-water lobe reservoirs. This study has a certain reference value for the efficient development of lobe reservoirs in micro basins.
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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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