SplitMultiSeis 3D technology is a three-dimensional engineering seismic survey for shallow waters, developed on the basis of hardware and software complex SplitMultiSeis.
3D seismic has a number of advantages over 2D profiling:
- High-detailed survey is reached by increasing the density of CMP points per township. This leads to complete information about the structure of the formation under study using a continuous grid of bins;
- 3D seismic allows to obtain continuous fields of evaluation of properties (characteristics) of the studied geological structures by calculating the correlation with seismic attributes;
- The possibility of 3D migration is reached, allowing to get rid of the out-of-the-plane reflection effect, which significantly (two and more times over) improves noise suppression compared to 2D profiling (with equal fold);
- Higher accuracy of detection, delineation and analysis of geological hazards is acquired;
- A wider range of reflection azimuths within a single bin is obtained, allowing to study the anisotropic properties of the structure.
These and other advantages significantly increase the accuracy of interpretation and allocation of geological hazards and, as a result, reduce the possible risks (for example, during the installation and operation of drilling platforms)
An attempt to search for, as well as interpret “dangers” in the photo, which was thinned out in correspondence to the methods of research, can serve as a graphic example to the above.
|2D profile (regional survey)
|2D seismic grid (engineering-geological survey)
SplitMultiSeis 3D is a three-dimensional engineering seismic survey that is fully adapted for solving engineering problems.
Combining two sources in the flip-flop mode with four 16 channel streamers allows to acquire a 16 m strip (8 inline with a 1×2 m bin) with a multiplicity of 16 in one ship journey.
Also operational quality control and primary processing of the data is carried out on board the vessel in real time.
The quality of navigation support surveys is the fundamental factor in the success of three-dimensional shooting.
The positioning of the devices of the SplitMultiSeis complex is carried out using 4 towed navigation buoys and a base on-board station that operate in a differential mode.