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发明公开
CN107575219A 一种页岩气储层地层破裂压力梯度计算方法 有权

一种页岩气储层地层破裂压力梯度计算方法
摘要：
本发明涉及页岩气储层地层破裂压力梯度计算方法，收集全井段的常规测井曲线数据，计算岩石骨架密度ρma，确定地层平均孔隙度Φ和流体密度ρw；收集页岩气井储层段深度、垂深、声波AC、密度DEN、中子CNL测井曲线数据；通过ρ＝(1-Φ)*ρma+Φ*ρw计算地层平均密度；通过拟合回归的方法确定破裂压力系数K：K＝P0+P1*AC+P2*DEN+P3*CNL,根据公式FRAC＝K*ρ计算页岩储层地层破裂压力梯度，再用公式：FP＝FRAC*H计算破裂压力，最后输出结果。本发明已在涪陵页岩气田应用页岩气井200多口井，计算的地层破裂压力梯度与实际施工获得的地层破裂压力梯度较接近，误差小于15％。
摘要（英）：

The invention relates to a shale gas reservoir formation fracture pressure gradient computing method. The method comprises the steps that conventional logging curve data of all sections of a well arecollected, the rock framework density rhoma is calculated, and the formation average porosity phi and fluid density rhow are determined; the depth, vertical depth, sound wave AC, density DEN and neutron CNL logging curve data of a shale gas well reservoir section are collected; the formation average density is calculated through the formula that rho=(1-phi)*rhoma+phi*rhow; and the fracture pressure coefficient K=P0+P1*AC+P2*DEN+P3*CNL through a fitted regression method, the shale gas reservoir formation fracture pressure gradient is computed according to the formula that FRAC=K*rho, then the fracture pressure is calculated through the formula that FP=FRAC*H, and the result is output finally. According to the method, more than 200 shale gas wells are applied to a shale gas field in Fuling,the computed formation fracture pressure gradient is close to the formation fracture pressure gradient obtained during actual construction, and the error is smaller than 15%.

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