| Qingdao Institute of marine geology, China Geological Survey | Host |
| Citation: |
ZHAO Hanqing, LI Chao, GUO Cheng, YUE Honglin, ZHANG Zhenglong. Geomorphology of channel sandbodies in fluvially dominated shallow water delta front: taking the Lower Member of the Minghuazhen Formation in BZ34 Oilfield of the Huanghekou Sag, Bohai Bay Basin as an example[J]. Marine Geology Frontiers, 2024, 40(2): 20-27. doi: 10.16028/j.1009-2722.2023.019
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Geomorphology of channel sandbodies in fluvially dominated shallow water delta front: taking the Lower Member of the Minghuazhen Formation in BZ34 Oilfield of the Huanghekou Sag, Bohai Bay Basin as an example
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Abstract
The Lower Member of the Neogene Minghuazhen Formation (N1ml) is the main oil-bearing sand body unit in the BZ34 Oilfield in Huanghekou Sag, Bohai Bay Basin, North China, in which delta front deposits in fluvially dominated shallow waters were developed. To better characterize the structural characteristics and distribution of the front sand bodies, taking the second oil unit of N1ml as an example, the sedimentary types, geomorphological structures, and depositional models of the sand body were analyzed based on the data from coring, seismic profiling, and logging. Results show that the sand bodies are dominated by underwater distributary channels in shallow water delta front. According to the logging curves and overlapping of the sand bodies, four channel types were recognized: massive incised river channel, layered overlapping channel, layered isolated channel, and finger-shaped isolated channel. The distribution and genesis of the sand bodies were affected mainly by paleotopography, sediment supply rate, base level cycle, and paleoclimate. The underwater distributary channel deposits in the BZ34 Oil Field are characteristic of incisive superposition in vertical direction and meandering patchy distribution in horizontal, which is similar to the modern case of fluvially dominated shallow water delta channels in Poyang Lake, South China. This study provided a guidance for infill adjustment and potential tapping in later stage for the remaining oil in BZ34 Oilfield.
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References
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ZHAO Hanqing, LI Chao, GUO Cheng, YUE Honglin, ZHANG Zhenglong. Geomorphology of channel sandbodies in fluvially dominated shallow water delta front: taking the Lower Member of the Minghuazhen Formation in BZ34 Oilfield of the Huanghekou Sag, Bohai Bay Basin as an example[J]. Marine Geology Frontiers, 2024, 40(2): 20-27. doi: 10.16028/j.1009-2722.2023.019
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Figure 1.
Regional geological map of the BZ34 Oilfield in Huanghekou Sag
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Figure 2.
Overlapping types of underwater distributary channels sand body in the N1ml of BZ34 Oilfield
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Figure 3.
Relationship between the minimum amplitude attribute and the sandstone net thickness in the N1ml in BZ34 Oilfield
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Figure 4.
Horizontal distribution of sand bodies in the N1ml in BZ34 Oilfield
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Figure 5.
Inter-well correlation of the sand bodies in the N1ml in BZ34 Oilfield
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Figure 6.
Sedimentary characteristics of distributary channels in the modern Ganjiang River shallow water delta in Poyang Lake
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Figure 7.
Characteristics of ancient landforms and shallow water delta development in the N1ml in BZ34 Oilfield
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Figure 8.
The developmental styles of distributary channel sand body structure and the controlling factors
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Figure 9.
Depositional model of distributary channel types of shallow water delta sandbodies in the N1ml in BZ34 Oilfield