新疆石油地质

新疆石油地质 ›› 1989, Vol. 10 ›› Issue (4): 49-55.

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应用地球物理方法预测地层破裂压力初探

陈新, 李庆昌   

  1. 新疆石油管理局勘探开发研究院; 新疆石油管理局勘探开发研究院
  • 收稿日期:1989-06-17 发布日期:2020-05-12

PRELIMINARY STUDY FOR APPLICATION OF GEOPHY-SICAL METHOD TO PREDICTING THE FRACTURE PRESSURE OF FORMATION

Chen Xin, Li Qingchang   

  1. Research Institute of Petroleum Exploration and Development, Xinjiang Petroleum Administration
  • Received:1989-06-17 Published:2020-05-12

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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Gf=Gp+[σ/（1-σ）]（G0-Gp）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。

Abstract: The prediction of fracture pressure of formation is useful to carrying out fracturing technology. This paper discusses the determination of parameters of Ea-ton's equation which can calculate the gredient of fracture pressure of formation i.e. Gt = Gp+ [σ/ (1-σ)] (Gσ-GP) . periicularly approching how to apply acoustic log to calculating Poisson's ratio σ. and experimental equation of dis- persed shale content in rock to it. Comparing the calculated value of fracture pressure of formation of well XL6 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.