Fast-track 'coloured' inversion
Fast-track 'coloured' inversion
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DOI：
10.1190/1.1815711
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
S. Lancaster;D. Whitcombe
中科院分区：
文献类型：
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作者：
S. Lancaster;D. Whitcombe
摘要地震数据到声阻抗的反演通常被视为一项专业活动，因此尽管有公开的好处，但反演数据仅在少数情况下使用。为了帮助克服这一障碍，我们的目标是开发一种新的算法，它不一定是同类中最好的，但将是快速和易于使用，并增加BPA内的反演产品的使用。这种新技术，“彩色反演”，性能显着优于传统的快速通道路线，如递归反演，以及基准对无约束稀疏尖峰反演。经验研究表明，无约束稀疏体反演可以近似地模拟为一个卷积过程，其算子的振幅谱将平均地震谱映射到平均地球AI谱，相位为-90 °。此外，根据瓦尔登和霍斯肯（1985）的反射率工作，我们发现，在任何给定的油田中，来自威尔斯井的AI测井曲线的总谱形式是相当恒定的。这意味着可以使用单个卷积算子来执行反演。该方法假设零相位子波，但不需要子波振幅谱的显式估计。零相位假设可以通过与AI测井相比较的反演数据的相位旋转来补偿。
Summary Inversion of seismic data to Acoustic Impedance is usually seen as a specialist activity, so despite the publicised benefits, inverted data are only used in a minority of cases. To help overcome this obstacle we aimed to develop a new algorithm which would not necessarily be best in class, but would be quick and easy to use and increase the use of inversion products within BPA. This new technique, ‘Coloured Inversion’, performs significantly better than traditional fast-track routes such as recursive inversion, and benchmarks well against unconstrained sparse-spike inversion. Empirical study has revealed that unconstrained sparsespike inversion can be approximately modeled as a convolutional process, with an operator whose amplitude spectrum maps the mean seismic spectrum to the mean earth AI spectrum, and has a phase of -90 o . In addition, following reflectivity work by Walden & Hosken (1985) we have found that the gross spectral form of AI logs from wells in any given field is reasonably constant. This implies that a single convolutional operator can be used to perform inversion. The approach assumes a zero-phase wavelet but does not need an explicit estimate of the wavelet amplitude spectrum. The zero-phase assumption can be compensated for by phase rotation of the inverted data in comparison with the AI logs.