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地震波在地层中的传播速度和岩层的性质,如弹性参数、地层成分、密度、埋藏深度、地质年代、孔隙率、构造运动等因素有关。特定的层速度分布规律包含着丰富的地层信息,能不同程度地反映地层力学特性。通过相似构造分析找出与预测井所在构造相似的构造,作相似构造测井速度与层速度误差补偿分析,在深刻地认识相似构造的井壁稳定性基础上,建立了基于趋势面分析理论的钻前预测井壁稳定模型,并对塔里木油田YN4井的安全泥浆密度窗口进行了钻前预测,现场应用表明,该预测模型是较为成功的。
Seismic wave propagation velocity in strata and rock properties, such as elastic parameters, stratum composition, density, burial depth, geological age, porosity, tectonic movement and other factors. The specific layer velocity distribution law contains abundant formation information, which can reflect the mechanical properties of formation to some extent. Based on the similar structure analysis, the structure similar to the predicted well is found, and the compensation of logging velocities and layer velocities in similar structures is analyzed. Based on the well recognition of the wellbore stability of similar structures, a trend analysis method based on trend surface theory The borehole stability model is predicted before drilling, and the predicted drilling mud density window of well YN4 in Tarim Oilfield is pre-drilled. The field application shows that the prediction model is more successful.