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Flume Tank Simulation on Depositional Mechanism and Controlling Factors of Beach-bar Reservoirs

Chenlin Hu1, 2, Yuanfu Zhang*1, 2, Deyong Feng3, Min Wang4, Zaixing Jiang1, 2, Chaowei Jiao1, 2
1. School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China;2. Institute of Earth Sciences, China University of Geosciences (Beijing), Beijing 100083, China;3. SINOPEC Shengli Geophysical Research Institute, Dongying 257022, China;4. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China

The beach-bar reservoir has become an important exploration target in China, but its depositional mechanism and controlling factors have not yet been fully modeled. They have become an inhibitory factor for the exploration and development of beach-bar reservoirs. The depositional mechanism of beach-bars and their controlling factors have been studied by means of a flume experiment including seven runs under controlled boundary conditions which were the water level (Run1, Run2 and Run3), wave parameters (Run1, Run4 and Run5) and initial slope (Run1, Run6 and Run7). The experiment revealed that the development of beach-bar was controlled by water level, wave parameters and initial slope. The deposited locations of distal bar and nearshore bar were controlled by the water level. Two beach-bars were migrated downward when the water level falls (Run1, Run2 and Run3). The width and thickness of distal bar and nearshore bar were controlled by wave parameters, especially the wave height. They increased with the scale of wave. But, the maximum thickness is limited by the water level (Run1, Run4 and Run5). The distance between distal bar and nearshore bar was controlled by the initial slope. It became shorter with the steeper slope. Distal bar and nearshore bar changed into one bar when the initial gradient was greater than 1/20 (Run1, Run6 and Run7). The results suggest formative mechanism and controlling factors related to beach-bars

 

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Keywords:Flume tank, depositional mechanism, controlling factors, beach-bar, wind, waves

DOI:
10.1007/s12583-016-0929-4
CLC number:
U469.72
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