【摘要】 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。更多还原

【Abstract】 The propagation velocity of seismic wave is dependent on the property of formations,such as formation component,elasticity,density,depth,geologic age,porosity and tectonic activity. The distribution of interval velocity is rich in the information of the formations through which the seismic wave transmits,and can reflect the mechanic property of the formations. According to the interval velocity of the well,the adjacent structure of maximum correlativity is determined by correlation analysis. The interval velocity error compensation function is acquired by Fourier trend surface analysis according to the logged data of the wells in the adjacent structure. Based on the result of borehole stability for the adjacent structure,the prediction models of borehole stability before drilling are established according to trend surface analysis theory,then the safe mud weight range for TalimuYN4 well is determined accordingly before drilling. The field application testifies that the model is feasible.更多还原