关键词: 煤层气, 压裂液, 污染, 三交区块, 山西临县

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.

Key words: coal-bed gas, hydro-fracturing fluid, pollution, Sanjiao block, Lin County in Shanxi Province