Velocity Model Building for Tilted Orthorhombic Depth Imaging
Velocity Model Building for Tilted Orthorhombic Depth Imaging
复制标题
倾斜正交深度成像的速度模型构建
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
T. Huang
中科院分区：
文献类型：
--
作者：
Yunfeng Li;W. Han;Chuen;T. Huang
摘要最近，倾斜横向各向同性（TTI）成像已成为墨西哥湾（GOM）深水的标准做法，以解决盐提取微型盆地中波传播的各向异性效应。倾斜正交各向异性（T-ORT）通常代表通常嵌入倾斜薄沉积层中的平行排列的裂缝，是一个限制较少的假设，可以应用于更复杂的地质构造。本文重点介绍了T-ORT深度成像的关键组成部分：T-ORT射线追踪，建立初始T-ORT模型的过程，以及T-ORT断层扫描。利用墨西哥GOM地区Perdido褶皱带的一个真实的多方位（MAZ）数据集，验证了T-ORT速度模型建立的有效性，其中T-ORT各向异性参数估计值与地质背景一致。T-ORT叠前深度偏移在所有方位角上都能得到共成像道集，从而改善了成像聚焦，并对该地区复杂构造进行了空间定位
Summary Recently, tilted transverse isotropic (TTI) imaging has become a standard practice in deep water Gulf of Mexico (GOM) to resolve the anisotropic effects of wave propagation in salt-withdrawal mini-basins. Tilted orthorhombic (T-ORT) anisotropy, which usually represents parallel-aligned fractures normally embedded in tilted thin sedimentary layers, is a less-restricted assumption and can be applied to more complicated geological formations. This paper focuses on the key components of T-ORT depth imaging: T-ORT ray tracing, the procedure to build initial T-ORT models, and T-ORT tomography. With a real multi-azimuth (MAZ) dataset in the Perdido fold belt, GOM, we demonstrate the effectiveness of the T-ORT velocity model building, where the estimated T-ORT anisotropic parameters are consistent with the geological setting. T-ORT prestack depth migration flattens common image gathers (CIGs) in all azimuths and results in improvements in image focusing, as well as spatial positioning of complex structures in the area