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Outline
In this paper, an oil field in Northern Jiangsu Province is selected as the research object, and a multiphase flow reaction migration model CO2-DSMRT for CO2 displacement and storage is constructed to describe the transformation and fate of supercritical state/gas phase, dissolved water phase, dissolved oil phase and mineral phase CO2 on a century scale. The sensitive parameters affecting the prediction results of the model are identified by Sobol method. Furthermore, PSO-LSSVM method was used to establish an alternative model to characterize the mapping relationship between sensitive parameter input and CO2 multiphase output results, and Monte Carlo stochastic simulation was carried out to quantify the uncertainty of the model. The results show that after 100 years of CO2 injection into the oil-water mixed layer, the gas phase CO2 accounts for 61.2%, the oil-soluble phase CO2 accounts for 17.8%, the water-soluble phase CO2 accounts for 11.2%, and the mineral phase CO2 accounts for 9.8%. The most sensitive parameter of co2-dsmrt model to oil production is permeability, and the most sensitive parameter to reservoir CO2 storage is porosity. The production investment ratio of CO2 storage capacity and oil production under different confidence levels is significantly different. P10scenario is suitable for storage priority strategy, P50 scenario can achieve the balance between storage and economic benefits, and P90 scenario is more suitable for production optimization strategy.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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