scholarly journals Characteristics and controlling factors of deep buried-hill reservoirs in the BZ19-6 structural belt, Bohai sea area

2019 ◽  
Vol 6 (4) ◽  
pp. 305-316 ◽  
Author(s):  
Mingcai Hou ◽  
Haiyang Cao ◽  
Huiyong Li ◽  
Anqing Chen ◽  
Ajuan Wei ◽  
...  
Keyword(s):  
Bohai Sea ◽  
Controlling Factors ◽  
Sea Area ◽  
Buried Hill

The relationship between source supply and mixed deposition of siliciclastic and carbonate: First to second member of the Shahejie Formation, Paleogene, Bohai Sea area, China

2021 ◽  
pp. 1-28
Author(s):  
Wei Xu ◽  
Zhengyu Li ◽  
Huiyong Li ◽  
Can Zhang ◽  
Meng Zhao ◽  
...  
Keyword(s):  
Large Scale ◽  
Bohai Sea ◽  
Source Area ◽  
Carbonate Sediments ◽  
Fine Grained ◽  
Strong Source ◽  
Shahejie Formation ◽  
Mixed Sediments ◽  
Sea Area ◽  
Buried Hill

There are various types of mixed siliciclastic-carbonate sediments developed in the Bohai Sea area during the period of the first to second member of the Shahejie Formation (E2s1-2) of the Paleocene. We have concluded that the period of E2s1-2 was very suitable for the development of carbonate minerals and organisms because of the stable tectonic background, the weak siliciclastic influence of large source systems outside the basin, and the high salinity of the water. There were many local uplifts inside the basin during E2s1-2, and the source area, supply direction, and quantity of the local provenance varied greatly. We summarized that the mixed sediments generally developed in the intermittent and stagnant periods of the source supply, or on the flank or distal end of the source supply direction due to the absence of direct interference of terrigenous clasts. To a large extent, the formation of different types of mixed deposits is controlled by the different spatiotemporal relationship with siliciclastic supply. The background of strong source supply led to the formation of large-scale mixed deposits that were mainly composed of terrigenous clasts. Mixed deposits are mainly composed of organisms and carbonate with relatively large depositional thickness formed on the flank of source supply in the steep slope area. On the flank of source supply in the gentle slope belt, thinner mixed deposits with terrigenous clasts mainly formed and thin-layer carbonate clastic-dominated deposits formed on abandoned deltas. On the uplift of the buried hill far away from the provenance, thick mixed deposits mainly composed of bioclastic were formed whereas fine-grained mixed deposits formed under the low-energy argillaceous background.

Sequence stratigraphy of the lacustrine rift basin in the Paleogene system of the Bohai Sea area: Architecture mode, deposition filling pattern, and response to tectonic rifting processes

2020 ◽  
Vol 8 (2) ◽  
pp. SF57-SF79
Author(s):  
Changgui Xu ◽  
Lu Huan ◽  
Song Zhangqiang ◽  
Jia Donghui
Keyword(s):  
Bohai Sea ◽  
Rift Basin ◽  
Third Order ◽  
Sequence Stratigraphic ◽  
The Bohai Sea ◽  
Stratigraphic Model ◽  
Architectural Patterns ◽  
Sequence Boundaries ◽  
Sea Area ◽  
System Tract

The Bohai Sea area is a complex lacustrine rift basin characterized by multistage rifts, polycycle superimpositions, and multiple genetic mechanisms. We recognized three types of sequence boundaries from the Paleogene strata of offshore Bohai, including 2 first-, 3 second-, and 10 third-order sequence boundaries. The third-order wedges, composed of the low-stand system tract (LST), lake expansion system tract (EST), and high-stand system tract (HST), are significant for hydrocarbon exploration. The sequence stratigraphic patterns vary in different periods. We discovered that the LST and EST are mainly developed in the rifting stage, whereas the HST is developed in the subsidence stage. Sequences developed in different depressions present significant variations, but the migration of the depocenter from the margin to the center during basin evolution can still be clearly recognized. Vertically, episodic tectonism plays an important role in controlling the formation of sequence boundaries, sequence structural features, and sequence architectural patterns. However, various rift basin marginal tectonics control the lateral sequence architectures. Because each structure belt is characterized by a unique sequence framework due to the strong influence of basin rifting processes, we establish a corresponding sequence stratigraphic model for the specific tectonic environment using process-based sequence stratigraphic methods.

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