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文章在四川成都洛带地区，根据对地应力分布规律和影响它的诸多因素的分析，引用前人的研究成果，充分利用测井信息，建立了地应力计算的半经验公式模型，利用测井资料确定了模式中的各参数，不仅可以方便迅速得到沿深度连续分布的地应力剖面，而且节约了昂贵的地应力测试费用，具有明显的经济意义和实用价值。根据测井计算的体积模量、泊松比、岩石强度的抗剪、抗压参数以及岩石的破裂压力和地层的孔隙压力等资料，并结合其它资料可对储层进行优选，同时可以分析其改造的难易程度，对压裂方案的设计有一定的参考价值。研究储层在平面上的展布特征是气田进一步开发的前提，而应力分布特征与油气有利聚集区紧密相关，一般来说，油气总是从高应力区向低应力区运移。因此，地层弹性及应力场分析对油气有利带分析和井位部署同样具有重要意义。

Application of Log Data in Analyzing the Formation Elastic Property and Stress Field of Luodai Gas Field

At Luodai region,Chengdu,Sichuan,t hrough analyzing the distribution law of ground stresses and their influencing f actors,a semiempirical formula model for calculating ground stresses was set up on the basis of the research results completed by our predecessors and of fully applying log data;and various parameters in the model can be determined by use o f log data,which may not only acquire the vertical continuous distribution groun d stress profiles conveniently and quickly but also economize the expensive cost for testing the ground stresses,thus possessing obvious economic significance a nd practical price.According to the parameters,such as bulk modulus,Poissons rat io,rock shearing strength,rock compression strength rock fracturing pressure and formation pore pressure,etc.,calculated with log data and in combination with t he other data,the reservoir optimization may be carried out and the degree of di fficulty of reservoir stimulation may be also analyzed,which has a certain of va lue for reference in fracturing plan design.The research on the characteristics of reservoir distribution on plane is the prerequisite for further developing ga s field.Ground stress distribution is closely related to the beneficial oil and gas accumulation regions,because the oil and gas migrate from high stress area to low stress area in general.Therefore the formation elastic property and stre ss field analyses are of important significance for prospecting the beneficial o il and gas accumulation zones and for selecting well spacing pattern.