压裂液在煤层中的运移模拟研究
Migration Simulation Research on Hydro-fracturing Fluid in Coal Bed

摘要： 为给山西省临县三交区块的地下水环境保护提供科学依据，运用地下水数值模拟技术对压裂液在煤层中的运移进行了预测。在分析研究区地质结构的基础上，建立了水文地质概念模型，将山西组3#煤层概化为一个承压含水层，其上覆二叠系砂岩、泥岩作为隔水层，下伏的泥岩、砂岩互层作为隔水层，并确定了地下水系统的边界条件。运用地下水模型软件(Feflow)对研究区内的压裂液在煤层中的运移进行了模拟和预测,预测结果表明，压裂液在煤层中的的运移范围在煤层压裂影响范围以内，即压裂井周围300 m范围内。
Abstract: To provide scientific foundation for the protection of groundwater environment in Sanjiao block of Lin County in Shanxi Province, the groundwater numerical simulation was conducted to predict the migration of hydro-fracturing fluid in coal bed. A hydrogeological conceptual model was set up based on the analysis of geological structure. The 3# group coal bed within Shanxi Formation was conceptualized as a confined aquifer, overlaid by Permian sandstone and mudstone and underlaid by interbeds of mudstone and sandstone functioning as quitards. In addition, groundwater boundary conditions were confirmed. Migration of hydro-fracturing fluid in coal bed of the study area was modeled and predicted. Results indicate that the migration range of hydro-fracturing fluid in the coal bed is within coal hydro-fracturing impact limits, about 300 meters around fractured well