摘要
地层破裂压力预测对压裂工艺实施具有实用价值。本文就伊顿公式计算地层破裂压力梯度G_f=G_p+[σ/(1-σ)](G_0-G_p)中,上覆岩层压力、地层孔隙压力和泊松比的确定,尤其是运用声波时差地球物理方法和岩石中分散泥质含量经验公式求取泊松比σ作了探讨,并用夏16井实例所计算的地层破裂压力与实测值相比,绝对差值仅0.2MPa。证明了这一结果是可信的,其方法是可行的。通过夏18、夏36井破裂压力梯度计算,证实了断裂或构造位置对其控制作用,指明了克—乌断裂控制了各油藏的破裂压力梯度的变化。
The prediction of fracture pressure of formation is useful to carrying out fracturing technology. This paper discusses the determination of parameters of Eaton's equation which can calculate the gredient of fracture pressure of formation i.e. G_f=G_p+ [σ/ (1-σ)] (G_o-G_p). perticularly approching how to apply acoustic log to calculating Poisson's ratio σ. and experimental equation of dispersed shale content in rock to it. Comparing the calculated value of fracture pressure of formation of well X16 with its determined value, we found that their absolute error is only 0.2MPa. It shows that the result is believable, and the method is available. The calculation of gredient of fracture pressure of formation in wells X18 & X36 confirms the control function of fault or structure, and points out the changes of the gredient of fracture pressure of formation of each reservoir, which is controlled by Karamay—Wuerhe fault.
出处
《新疆石油地质》
CAS
CSCD
北大核心
1989年第4期49-55,共7页
Xinjiang Petroleum Geology
