A calculating method of underground stress of reservoir with logging data and its application in Anpeng oil-bearing block

In order to lower the risk of well pattern arrangement and waterflood development(including high-pressure water injection)in oilfields especially in the oil and gas fields with middle-low permeability,reduce the blind- hess of fracturing reformation and realize the rational oil- field development,an accurate forecasting of the shape of hydraulic fissure based on the current underground stress of reservoirs must be obtained.The method depending on logging data is a low-cost research method to calculate the underground stress of reservoirs.Compared with the plane distribution of underground stress in the same reser- voir,the underground stress profile got from the method is more accurate and can be used as the guidance for well pattern arrangement with low-permeability and fractu- ring reformation of all reservoirs.The example calculation results show this method possesses great application and popularization value.