POST-STACK DIP- AND AZIMUTH PROCESSING

摘要

This paper describes background and applications of post-stack dip- and azimuth processing. Our workflow starts with the creation of a "steering-cube", i.e., a volume that contains seismic dip-and azimuth information at every sample position. From the steering cube we derive a number of interesting attributes. In this paper we present the variance of the dip as a valuable indicator for capturing chaotic reflection patterns. We also show how the steering cube enables us to derive curvature attributes at every sample position in a volume. These attributes are used a/o to detect faults and subtle stratigraphic features. Without the benefit of a "steering cube, curvature attributes can only be calculated along mapped horizons. Another application of the steering cube is its use to extract information from the original seismic volume along local reflector orientations. This "dip-steering" process can be used to filter data and to extract volume attributes. In this paper we will discuss dip-steered, edge-preserving smoothing filters that remove non-coherent noise and enhance laterally continuous events without introducing filter-tails at event edges. Similarity is presented as an example of a dip-steered volume attribute. To show the importance of dip-steering we compare similarity with and without dip-steering. All presented example applications show the value and versatility of the steering cube.