岩石力学参数试验与地层破裂压力预测研究

Rock mechanical parametric experiments and the research of formation fracture pressure prediction

通过对塔里木盆地群库恰克地区4口井中的7个地层100块岩心进行岩石力学参数试验和声波试验,获得了该地区岩石的弹性模量、泊松比、纵横波时差等一系列岩石静态力学参数。对试验结果进行了分析研究,得到了岩石纵横波时差关系拟合模型。结合测井资料所得到的岩石动态力学参数,回归出了群库恰克地区岩石的动静态力学参数模型,为预测群库恰克地区地层破裂压力提供了准确的岩石力学参数。在建立群库恰克地区地层破裂压力预测模型过程中,基于岩石的破裂机理,提出了一种地层破裂压力预测的新模型,该新模型已用于群库恰克地区地层破裂压力预测,为合理确定钻井液密度提供了理论依据。

The elastic modulus, Poisson ratio, S-P interval and other static rock mechanical parameters were obtained through the rock mechanical parametric experiments and acoustic experiments of the 100 drilling cores from 7 layers and 4 wells in Qunkuqiake Block of Tarim Basin. The matching model of rock S-P interval relationship can be derived from the results of the experiments. Combine with the static rock mechanical parameters obtained from logging data, the static rock mechanical parametric model of the Qunkuqiake Block can be derived. This provides accurate rock mechanical parameters for formation fracture pressure prediction in Qunkuqiake Block. When build up the forecast model of the formation fracture pressure in Qunkuqianke Block, a new model was developed for formation fracture pressure prediction on base of the fracturing mechanism. This new model has already been used on the formation fracture pressure prediction in Qunkuqiake Block, and it provides theoretical criterion for the proper selection of drilling fluid density.