Impact of seismic image quality on fault interpretation uncertainty
Impact of seismic image quality on fault interpretation uncertainty
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DOI：
10.1130/gsatg282a.1
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发表时间：
2017-02
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影响因子：
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通讯作者：
J. Alcalde;C. Bond;G. Johnson;J. F. Ellis;R. Butler
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文献类型：
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作者：
J. Alcalde;C. Bond;G. Johnson;J. F. Ellis;R. Butler
地震图像的地质解释中的不确定性受到图像质量的影响。使用定量图像分析技术，我们映射的图像对比度和反射连续性的差异，为两个不同的表示相同的灰度地震图像，一个在双向时间（TWT）和一个在深度。深度图像的对比度和反射连续性低于TWT图像。我们比较了196个解释的结果，一个单一的断层的地震图像的质量。低对比度和连续性区域对应于更大范围的解释断层几何形状，从而导致深度图像中断层解释的更广泛传播。解释的断层几何形状中的细微差异引入了断层特征的变化（例如，抛掷、起伏），这对于理解地壳和岩石圈过程至关重要。地震图像质量影响解释的确定性，如断层解释范围的增加所证明的。图像质量的定量评估可以告知：（1）基于模型的解释（例如，断层几何预测）比主观解释更可靠;（2）用于预测地壳伸展等构造过程的断层解释的不确定性评估。
Uncertainty in the geological interpretation of a seismic image is affected by image quality. Using quantitative image analysis techniques, we have mapped differences in image contrast and reflection continuity for two different representations of the same grayscale seismic image, one in two-way-time (TWT) and one in depth. The contrast and reflection continuity of the depth image is lower than that of the TWT image. We compare the results of 196 interpretations of a single fault with the quality of the seismic image. Low contrast and continuity areas correspond to a greater range of interpreted fault geometries, resulting in a broader spread of fault interpretations in the depth image. Subtle differences in interpreted fault geometries introduce changes in fault characteristics (e.g., throw, heave) that are critical for understanding crustal and lithospheric processes. Seismic image quality impacts interpretation certainty, as evidenced by the increased range in fault interpretations. Quantitative assessments of image quality could inform: (1) whether model-based interpretation (e.g., fault geometry prediction at depth) is more robust than a subjective interpretation; and (2) uncertainty assessments of fault interpretations used to predict tectonic processes such as crustal extension.