摘要
页岩储层具有一定密度和连通性的天然裂缝,而对复杂天然裂缝网络的描述非常困难。目前还没有针对页岩气藏的渗流模型,其模拟模型还基于常规的黑油模型或双重介质模型。黑油模型适用性广、解法完善,是目前油气藏数值模拟中最经典的模型,但是它不能考虑气体解吸附作用;因此,对页岩气藏的适用性比较差。文中建立以溶解气模拟吸附气的模型。即利用溶解气油比曲线模拟朗格缪尔等温吸附曲线,将油相视为不可流动相,黑油模型中的气相即为页岩气藏中的自由气。考虑了气体的解吸附作用和扩散作用,对比了其与单一介质的模拟结果,与传统的双孔单渗模型模拟结果相比,二者均能较好地进行页岩气产能预测。
Shale reservoirs have some natural fractures with a certain density and connectivity.But the network description of complex natural fracture is very difficult.At present,there is not a seepage model for shale reservoir.The simulation model of shale gas reservoir is also based on conventional black oil model or dual media model.Black oil model has wide applicability and perfect solution and is the most classic model in the numerical simulation of hydrocarbon reservoirs.But it does not consider the gas desorption,therefore,it is relatively poor for the applicability of shale gas reservoirs.Using the method to simulate dissolved gas adsorption gas,namely the use of dissolved gas oil ratio curve of simulation Langmuir adsorption isotherm,the oil phase can be regarded as the mobile phase and the gas phase in black oil model is free gas.This paper considers the gas sorption and diffusion and compares with the simulation result of a single medium.The simulation results of traditional single-permeability model show that both can effectively predict the shale gas productivity.
出处
《断块油气田》
CAS
2014年第6期755-758,共4页
Fault-Block Oil & Gas Field
基金
中国科学院战略性先导科技专项(B类)(XDB03010000)
关键词
页岩气
裂缝
双重介质模型
吸附
解吸
shale gas
fracture
dual medium model
adsorption
desorption
