Full
WU Hongli,born in 1999,is a Ph.D. candidate. She is mainly engaged in reservoir characterization and modelling research. E-mail: 2022311113@student.cup.edu.cn.
Outline
The shale oil in shale intercalated layer in the Yanchang Formation of Ordos Basin predominantly occurs in lacustrine gravity flow lobe “interlayers”,which serve as crucial reservoirs. However,the internal architecture patterns of single lobes remain unclear due to limited subsurface data resolution,constraining horizontal well drilling success rates and production efficiency. This study conducts refined architectural analysis of sublacustrine fan gravity flow lobes through integrated geological survey,UAV digital modeling,and sample analysis at the Maquan outcrop of the Triassic Chang 7 Member in Tongchuan City. Key findings include: (1)The Maquan outcrop primarily develops three sedimentary microfacies: lobes,deep-lake mudstone deposits,and slumps,containing seven lithofacies types: massive sandstone facies(Sm),normally graded siltstone facies(Sg),convolut-bedded siltstone facies(Ssd),massive muddy siltstone(Mp),massive mudstone facies(Mm),horizontal bedding shale facies(Sh),and tuff facies(Tb).(2)In direction of provenance,single lobes exhibit mound-shaped geometries composed of multi-stage stacked massive fine and very fine sandstones and black mudstone shale.(3)Single lobe stacking patterns are controlled by flood-induced sediment supply,showing progradational stacking. Erosional stacking occurs during high-magnitude floods,characterized by thick sandstone units with irregular erosional contacts and steep foreset angles. Draping stacking develops under low-magnitude floods,featuring thinner sandstone units separated by continuous mudstone layers with gentle foreset angles. These findings enhance the theoretical framework of sublacustrine fan lobe architecture and provide critical insights for optimizing horizontal well development in interlayered type shale oil.
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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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