Applications of the seismic attributes cube in the Cuu Long basin, offshore Vietnam

Tóm tắt

Seismic attributes are a powerful aid to seismic interpretation. They allow us to interprete faults and channels, recognise the depositional environment and unravel the structural deformation history more rapidly. This paper discusses several examples of seismic attributes as CTC and ESP from the Cuu Long basin offshore Vietnam.
Seismic coherency (CTC) is a measure of the similarity between seismic traces. Coherency data play an important role in the delineation of structural and stratigraphic features by enhancing the images seen on the conventional 3D seismic data. A coherency cube was utilised to enable a quick interpretation of the structural framework of an area of a block in the Cuu Long basin. In particular CTC attribute slices near the surface of basement, together with fault interpretation of seismic data, could indicate the presence of possible smaller localised faults the basement surface of C and VT structures.
Event Similarity Prediction (ESP) is a seismic discontinuity volume attribute. Seismic discontinuity attributes quantify the degree to which neighboring seismic traces vary from each other. They detect abrupt lateral changes in seismic data character caused by faults, diapirs and stratigraphy. ESP data were used to assist prediction of the distribution of faults/fractures zone inside the CNV basement area. These examples illustrate how CTC and ESP data can be used in exploration to improve the imaging of geological features.