倾斜界面叠前深度偏移深度空校方法
发布时间：2018-10-19 07:07
【摘要】：为了精确刻画地下构造形态,克服由于地震偏移速度与地层实际速度差异造成的叠前深度偏移深度与钻井深度误差,基于几何地震学理论,考虑成像速度和地层速度差异引起的深度误差和位置方向变化,推导出一种实现叠前深度偏移资料深度域空校方法。应用不定度的主方向确定每个面元的移动方向,使处理剖面各地震反射层面与所有钻井深度相符合,有效地提高了叠前深度偏移资料的成像精度。通过23口井构造不定度方法校正证实,该方法所成构造图精度较高,相对误差均小于2.3‰。
[Abstract]:In order to accurately describe the shape of underground structures and overcome the errors of depth migration and drilling depth caused by the difference between seismic migration velocity and actual formation velocity, based on geometric seismology theory, Considering the variation of depth error and position direction caused by the difference between imaging velocity and formation velocity, a method of depth spatial calibration of prestack depth migration data is derived. The main direction of uncertainty is used to determine the moving direction of each plane, so that the seismic reflection layers of the processing profile are consistent with all drilling depths, and the imaging accuracy of prestack depth migration data is improved effectively. The correction of structural indeterminacy in 23 wells shows that the method has high accuracy and relative error is less than 2.3 鈥，
本文编号：2280484
[Abstract]:In order to accurately describe the shape of underground structures and overcome the errors of depth migration and drilling depth caused by the difference between seismic migration velocity and actual formation velocity, based on geometric seismology theory, Considering the variation of depth error and position direction caused by the difference between imaging velocity and formation velocity, a method of depth spatial calibration of prestack depth migration data is derived. The main direction of uncertainty is used to determine the moving direction of each plane, so that the seismic reflection layers of the processing profile are consistent with all drilling depths, and the imaging accuracy of prestack depth migration data is improved effectively. The correction of structural indeterminacy in 23 wells shows that the method has high accuracy and relative error is less than 2.3 鈥，
本文编号：2280484
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