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逆时偏移求解全波方程能模拟波场在地下传播的真实情况,但其计算成本太高。目前,正交坐标系单程波下行延拓以其计算效率、精确性、稳定性和处理高速变化速度模型的能力,成为工业界普遍采用的复杂介质成像方法。但是当构造存在陡倾角或波场中存在回转波时,其成像精度不足。非正交系单程波延拓能提高陡倾角和回转波的成像精度。从倾斜坐标系、曲线坐标系和椭圆坐标系3个方面详细阐述了非正交系单程波偏移方法。
The inverse time migration solves the full wave equation can simulate the real situation of the wave field propagating underground, but its calculation cost is too high. At present, the one-way downlink continuation of orthogonal coordinate system has become the commonly used method of complex media imaging in the industry due to its computational efficiency, accuracy, stability and ability to handle high-speed changing speed models. However, the imaging accuracy is not enough when there is a steep dip angle in the structure or there is a rotating wave in the wave field. Nonorthogonal one-way wave continuation can improve the imaging accuracy of steep dip and gyro wave. The non-orthogonal one-way wave migration method is elaborated from three aspects: inclined coordinate system, curvilinear coordinate system and elliptic coordinate system.