绕射层析成像是一种高分辨率成像技术,它适用于井旁地层速度的成像。在应用于合成模型数据的成像时,其空间分辨率小于一个声波波长。然而,常规滤波反向传播绕射层析成像算法是以弱散射和恒定背景速度假设为基础,在应用于实际复杂构造模型时,它有一定的局限性。本文介绍了一种新的、计算效率高的单波型(P波)绕射层析成像算法,并介绍了它在一组模型上的应用结果。这些模型反映了实际地质情况,其变化最剧烈处可用一组水平层近似表示。算法从地下层状速度模型出发,该模型可以用测井数据或旅行时层析成像构成。应用层状绕射层析成像修改该模型,从而揭示出断层,尖灭及倾斜层等构造。文中概要介绍了层状绕射层析成像算法及其在计算时的实际方法。只要 Diffraction tomography is a high-resolution imaging technique that is suitable for imaging formation velocities near wells. When applied to the imaging of synthetic model data, the spatial resolution is less than one acoustic wavelength. However, the conventional filtering backpropagation tomography algorithm is based on the assumption of weak scattering and constant background velocity, and has some limitations when applied to the actual complex structure model. This paper introduces a new, computationally efficient single-wave (P-wave) diffraction tomography algorithm and presents its application in a set of models. These models reflect the actual geology, and the most dramatic changes can be approximated by a set of horizontal layers. The algorithm starts from an underground layered velocity model that can be constructed using logging data or travel-time tomography. Layered diffraction tomography was used to modify the model, revealing the fault, pinch out and tilt structures. This paper presents an overview of the layered diffraction tomography algorithm and its practical method of calculation. as long as