Schlumberger

Processing

Platform and hardware

Our VSP processing is carried out using the Q-Borseis borehole seismic processing service, a fully integrated suite of applications on the Omega seismic data processing software platform.

The unique aspects of VSP data and borehole seismic geometries are managed through tailored and proprietary algorithms.

Time picking

The manual QC and edit of picked times is facilitated by our fully interactive multiview capability within our Omega processing software.

Data rotations

Prior to rotation, bad traces are removed, navigation is confirmed, and travel times are verified. Rotated data is output in seg-y format.

Multiview

Multiview gives you the ability to view the data in a variety of domains, ranging from a map view of the entire dataset to common receiver and shot domains.

Single component processing

Each individual trace is examined and trace headers verified for the entire data volume prior to velocity filter wavefield separation and deconvolution. Velocity filtering is performed on the vertical channel only. Coherent noise such as shear waves can be reduced using a variety of filtering techniques.

If the input data quality is good, processing will result in a clean, high resolution compressional wavefield. In deviated wells, we use earth-frame true vertical data.

Three component processing

Each trace is examined and trace headers verified for the entire data volume prior to data rotations. The x, y, and z axis traces are carried in the processing. Data rotations put the recorded x, y, and z data into an Earth reference frame and appropriate wavefield separation would be applied to separate down- and up-going P and S waves.

If data quality permits, then Wavesip separation is applied to separate compressional and shear wavefields while simultaneously performing up/down separation. This is followed by deterministic deconvolution.

Wavesip separation is applied if data quality permits and this is followed by deterministic deconvolution. Pp and Ps wavefields are processed independently.

Model building, tomography, and statics

Schlumberger has integrated tools (Gemini and Disocuri) for 3D model building, survey design, salt proximity analysis, and tomography.

Gtomo is our 3D tomography tool and includes flexible options for constraining model updates based on smoothness or layer exclusion. If a 1D earth model is appropriate then additional functionalities are available, including 3D NMO correction and AVA analysis.

3D migration

We have access to three types of 3D migration: ray-based Kirchhoff/generalized random transform (GRT); wave equation migration (WEM); and reverse time migration (RTM).

Final deliverables for the migration include a 3D P-wave data volume migrated in depth seg-y format. If three-component processing is undertaken, followed by 3D migration, a 3D Pp wavefield and/or a 3D Ps wavefield volume migrated in depth can be output in seg-y format. The corresponding two-way time (TWT) volumes will be delivered as well.

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