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利用测井信息准确地计算碳酸盐岩地层的破裂压力难度较大。文章在对现有的各种地层破裂压力计算模型进行分析评价之后，根据三向地应力模型和岩层破裂机理，结合碳酸盐岩地层的低孔、各向异性、非均质性和岩石力学特性及测井响应特征，提出了一种适合于碳酸盐岩剖面的地层破裂压力的测井预测新模型，并重点研究了模型中各参数的提取方法。利用该模型及其解释程序对川东地区DKH构造DU4井等的碳酸盐岩井段的测井资料进行了地层破裂压力预测处理。应用表明，该法从测井信息中提取的碳酸盐岩地层破裂压力是可靠的，且精度较高、实用性强，可以用于指导碳酸盐岩地层钻井液密度的设计与选择合理的压裂施工压力。

LOG PREDICTION OF CARBONATE FORMATION BREAKDOWN PRESSURE

It is difficult to calculate precisely carbonate formation breakdown pressure by use of log data.After having analyzed and evaluated various existent models of calculating formation breakdown pressure,according to three-directional ground stress model and rock breakdown mechanism and in consideration of the geological features,as the low porosity,anisotropism and heterogeneity,rock mechanical properties and log response of carbonate formation,a new log prediction model suitable for the carbonate formation breakdown pressure was put forward and the methods of selecting various parameters in the model were emphatically studied by the authors.The log prediction of formation breakdown pressures of the carbonate rock intervals in well DU-4 in DKH structure was carried out by use of the model and its interpretation software.Through application,it was indicated that the carbonate formation breakdown pressures selected from log data by applying this method are reliable and they may be used for guiding the design of drilling fluid density and the reasonable selection of fracturing work pressure,having relatively high accuracy and strong applicability.