复杂条件下火山岩气藏单井数值模拟研究

火山岩储层作为一种特殊的油气储层类型越来越受到人们的关注,在我国松辽盆地北部深层火山岩储层中发现了大规模的天然气藏。火山岩储层具有孔隙、裂缝双重介质特征,渗流过程受启动压力梯度、滑脱效应、应力敏感性的影响。从物质守恒原理出发,考虑多因素,建立复杂条件下双重介质火山岩气藏气、水两相渗流数学模型,进行数值求解,编写计算程序,对不同边界不同因素条件下的动态变化规律进行对比研究。实际单井数值模拟结果表明:启动压力梯度和应力敏感不利于火山岩气藏的开发,综合考虑多因素的计算结果更符合实际火山岩气藏的开发动态。

Single Well Numerical Simulation under Complicated Conditions in Volcanic Gas Reservoir

It is paid more attention to volcanic reservoirs as a special type of oil and gas reservoirs.The large scale gas reservoirs have been found in the deep volcanic formation in the north of Songliao basin,China.Since the volcanic gas reservoirs have the dual media of pore and fissure,the percolation process is affected by start-up pressure gradient,slippage effect,and stress-sensitive.Based on principle of matter conservation,we establish the flow mathematical model of gas-water two phases under complex conditions and write the calculation procedures behind numerical solution.And then we discuss the dynamic changes under different boundary conditions.Numerical simulation results show that the calculated results gotten in the comprehensive multi-analysis are more realistic to develop the volcanic gas reservoir than that of the start-up pressure gradient and stress sensitive.