How Broadband, High Dense, Full Azimuth Point Source Point Receiver Acquisition Improves Seismic Interpretation in Onshore Abu Dhabi

摘要

Acquiring seismic data with S4 (Single Source, Single Sensor) is proven technology and it has many advantages over the conventional source and receiver array acquisition type. The array has an intra array statics issue when deployed on large elevation variation such as sand dunes and attenuating higher frequencies as well. S4 with denser spatial sampling with smaller shotline and receiver line spacing could jointly with seismic data broader bandwidth to improve interpreting many seismic details such faults, fractures, tiny stratigraphic features resolution. A debate was raised locally about the value of acquiring seismic data with S4, if only for the sake of acquiring seismic data with shorter time duration compare to the too much equipment needed for array acquisition type that consumes longer time in general. Alternatively, S4 really bring a real value of information and producing an outstanding seismic volume for amenable interpretation with confidence that will lead to utilize the seismic data to help in optimizing the well trajectories placement. This high density broadband 3D seismic acquired survey with fully sampled wave-field data has used the latest acquisition and imaging technologies, it has delivered critical information that can help to reduce drilling risks and to support future 4D reservoir monitoring which improved signal to noise ratio when compared with legacy dataset. An advance seismic processing workflow is tailored to improve the final image quality, and to preserve the azimuthal amplitude variation with offset and azimuth, which in turn can lead to the derivation of intrinsic rock property attributes for better reservoir characterization. A multi azimuth Prestack depth migration approach resolved most of the effects of heterogeneities in the shallow part and in the velocity field, which sometimes can be misinterpreted as azimuthal anisotropy.