Research On Seepage And Solute Transport Simulation Of Underground Petroleum Storage Caverns

The petroleum reservation has direct relationship with the political and economic security, so some large-scale petroleum storage stations have been constructing in recent years, one of the most important way is the underground petroleum storage caverns.The first part consists of the working principle, the research development of the underground petroleum storage caverns and the groundwater flow and solute transport. Then the hydrometeorologic conditions, the geological conditions and the hydrogeologic characteristic are analyzed. In chapter 3, the engineering situation of the Underground Petroleum Storage Caverns is introduced.On the basis of the on-site investigation and data analysis, the hydrogeologic conditions and the underground petroleum storage caverns and the water curtain system are generalized. To simulate the seepage field in the study area, two flow models, one with water curtains and the other without, are created using Visual MODFLOW. The water head distribution in the first and second year after the caverns are excavated and in the 5th, 10th, 20th, 50th year of the operational phase on the typical profile is forecasted on the two conditions. The quantity of gushing groundwater and the extending of groundwater depression cone as well as the groundwater level variation over the caverns are estimated by running the models. By comparing of the results on the two conditions, the importance of the water curtain on the safety of oil storage and groundwater resource protection is verified by numerical simulation method. The conclusion shows that the water curtain is necessary for underground petroleum caverns.The numerical model of solute transport in study area was created, and the initial concentration in the study area and the caverns was determined by the present water quality investigation. The dispersity was fitted by analogy of the hydrogeologic conditions. Running the model with the flow model, the concentration distribution of petroleum and IDMn on the typical profile is achieved. According to the results, the solute concentration has no obvious change, and there is only a small difference with the initial concentration. The underground petroleum caverns won't have adverse effect on the groundwater environment when normally operated, so it is a feasible method for petroleum storage.In the last chapter, the simulation results of the flow model and the solute model are analyzed systematically, and a series of groundwater protection methods and suggestions are given in response to the characters of the project and the simulation results.