盆地异常低压系统处置油田污水可行性

发布时间：2018-08-13 17:36

【摘要】：松辽盆地十屋断陷区油气分布复杂,勘探程度高,油田外排污水规模巨大,常规技术处理污水效果不理想。区内4km以下部分地层呈负压态,若容储介质参数达到相应地质填埋标准,则可在工程实践中尝试应用。结合该区水文及地质资料,建立地下水流及污水污染物迁移数值模拟模型,模拟研究区低压系统入注污水时地下水流动特征及污染物的迁移规律,同时估算了系统空间污水容储量。在预测过程中,分析了断陷区负压形成机制及分布特点,同时结合虚拟粒子示踪及注水过程,对污水的环境影响度进行了预测。研究结果表明,十屋断陷异常低压区是一个天然污水封闭储藏区,系统地层压力梯度仅为0.005~0.008 MPa/m,容储量高达1.241×108 m3,且污染物逃逸概率极小,非常适合油田污水的处置。
[Abstract]:The distribution of oil and gas in Shiwu fault depression area of Songliao Basin is complex, the exploration degree is high, the scale of sewage discharged out of oil field is huge, and the treatment effect of conventional technology is not ideal. The formation below 4km is in a negative pressure state. If the parameters of storage medium reach the corresponding standard of geological landfill, it can be used in engineering practice. Based on the hydrological and geological data in this area, a numerical simulation model of groundwater flow and pollutant transport in sewage was established to simulate the characteristics of groundwater flow and the migration of pollutants when sewage was injected into the low-pressure system in the study area. At the same time, the storage capacity of the system space sewage is estimated. In the process of prediction, the formation mechanism and distribution characteristics of negative pressure in fault subsidence area are analyzed, and the environmental impact degree of sewage is predicted by combining virtual particle tracing and water injection process. The results show that the abnormal low pressure area of Shiwu fault depression is a closed storage area of natural sewage, the pressure gradient of the system is only 0.005 ~ 0. 008 MPA / m, the storage capacity is as high as 1.241 脳 10 ~ 8 m ~ 3, and the escape probability of pollutants is very small, so it is very suitable for the disposal of oilfield sewage.
【作者单位】：中国地质大学环境学院;中国石油勘探开发研究院;
【基金】：国家“十二·五”重大专项项目(2011ZX05009-002)~~
【分类号】：X741

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