Article ; Online: The delta-fluvial evolution of a lacustrine basin with gentle slope and low sedimentation rate: A case study of the Fudong Slope, Junggar Basin, Northwest China
Elsevier B.V. Sedimentary Geology. 2023 July, v. 453 p.106441-
2023
Abstract: ... Formation (J₂t) in the Fudong slope of the Junggar Basin were analysed. The results indicated ... that the Fudong slope showed the characteristics of low sediment input. Sediments mainly originated from the Shaqi ... conditions of the Fudong slope, the subaqueous distributary channels of the delta environment and the point ...
| Abstract | Gentle slope belts of lacustrine basins are important areas for the generation of stratigraphic petroleum reservoirs controlled by sedimentary systems. Based on coring, well logging, 3D seismic and analytical test data, the sedimentary system and sandbody distribution characteristics of the Jurassic Toutunhe Formation (J₂t) in the Fudong slope of the Junggar Basin were analysed. The results indicated that the Fudong slope showed the characteristics of low sediment input. Sediments mainly originated from the Shaqi uplift, and the sediment input gradually weakened from the early to the late J₂t stages. The sedimentary system evolved from a delta to a meandering river, resulting in a delta front facies in the 1st member (J₂t₁) and a meandering river facies in the 2nd (J₂t₂) and 3rd (J₂t₃) members of the Toutunhe Formation. A sedimentary evolution pattern for the gentle slope with low sediment input was established. Thick deltaic sandbodies developed locally in the J₂t₁ stage. However, meandering rivers with high sinuosities predominantly developed and resulted in a striped geometry in the J₂t₂ and J₂t₃ members. Moreover, the meandering sandbodies exhibited an anastomosing morphology after multistage superposition. The channel and point bar facies in J₂t₂ were more developed than those in J₂t₃ because of sediment input differences. Under low-sediment input conditions, the sedimentary environment of the gentle slope belt in the lacustrine basin was controlled by changes in the palaeoclimate, palaeogeomorphology, gradient (slope) and base level. Palaeoclimate was the main factor controlling the evolution of the sedimentary environment. Palaeogeomorphology and slope controlled the distribution of sedimentary microfacies, channel sinuosity and sandbodies. Base-level change restricted the sandbody superimposition style. Under the low sediment input conditions of the Fudong slope, the subaqueous distributary channels of the delta environment and the point bars of the meandering river environment in the transitional belt of the Fudong slope are the main potential targets for stratigraphic petroleum reservoirs, whilst the 2nd member of the Toutunhe Formation (J₂t₂) is the main favourable interval for stratigraphic reservoir exploration. |
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| Keywords | Jurassic period ; basins ; case studies ; evolution ; geometry ; geophysics ; paleoclimatology ; petroleum ; rivers ; sedimentation rate ; sediments ; China ; Gentle slope belt of a lacustrine basin ; Sedimentary evolution ; Low sediment input ; Controlling factors ; The Fudong slope of the Junggar Basin |
| Language | English |
| Dates of publication | 2023-07 |
| Publishing place | Elsevier B.V. |
| Document type | Article ; Online |
| ZDB-ID | 216739-6 |
| ISSN | 0037-0738 |
| ISSN | 0037-0738 |
| DOI | 10.1016/j.sedgeo.2023.106441 |
| Database | NAL-Catalogue (AGRICOLA) |
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