快速确定页岩气储层地层破裂压力梯度的一种方法

A Method to Quickly Identify Formation Fracture Pressure Gradient of Shale Gas Reservoir

为了克服页岩地层破裂压力伊顿(Eation)模型、斯蒂芬(Stephen)模型、安德森(Anderson)模型计算误差偏大问题,通过对建南气田、涪陵页岩气田页岩气水平井气层地层破裂压力梯度研究,建立了引入气层饱和度参数的页岩储层地层破裂压力梯度计算新模型。中扬子地区建南气田、涪陵页岩气田及湘鄂西地区的360多口页岩气井应用表明,页岩气储层地层破裂压力梯度平均计算误差小于15%,能满足现场储层评价和压裂改造指导需要。

A new model for calculating fracture pressure gradient of shale reservoir with gas reservoir saturation parameter is establishment based on the research on gas formation fracture pressure gradient of horizontal shale gas wells in Jiannan Gasfield and Fuling Shale Gasfield to overcome too large calculation error of shale formation fracture pressure caused by Eation model,Stephen model and Anderson model.The application of the new model in more than 360 shale gas wells shows that the average calculation error of fracture pressure gradient is less than 15%,meeting the need for field reservoir assessment and fracturing guidance.