Julia: nodal survey delivers an exceptional image.
Our Julia survey summarizes the entire FairfieldNodal story—our full range of technology and the value it delivers—into one spectacular image. This story consists of:
- A proven deepwater acquisition built around quality, reliability, efficiency and safety;
- Proprietary processing and imaging technology designed to get the most out of node acquisition;
- Flexible commercial terms designed around the recognition that our customer’s investment in node technology is part of a life-of-field seismic solution, one that not only provides a superior image but will enhance and extend production and reservoir optimization.
Node acquisition: a better image earlier.
OBN technology excels in the later stages of life of field by delivering high-quality, full-azimuth images for production seismic. However, operators are now beginning to realize the importance of having the best quality image from the earliest stages of field development.
To make the most of their investment, operators must acquire seismic data that brings value throughout the life of field. Whether selecting an initial well location or characterizing a productive field, OBN seismic data acquisition provides a superior image and a higher level of certainty about where to drill and how to develop reserves.
Julia Survey Geometry
- 93.6 sq. mi. / 10.4 OCS blocks
- 400m x 400m node spacing
- 37.5m inline shot spacing x 50m shot line spacing
- 6km shot halo
- 12km min. maximum offset
- 1500 nodes on the seafloor
- 365,724 shot points
The Julia survey is located in the Walker Ridge area of the Gulf of Mexico. In this case, the Julia field operator made a critical decision in committing to node technology early in the productive life of the field. The long-offset, wide-azimuth, broadband and high signal-to-noise-ratio data provides a superior image and is the ideal baseline survey for future 4D analysis and reservoir characterization.
Node processing: a new specialty
At FairfieldNodal, we have teams of experienced and highly trained processors, research geophysicists and software development specialists. We are the industry leaders in node processing, and the work begins immediately after node retrieval.
Here, onboard processors ensure the integrity of the data collected by our Z3000® field crew. Our onboard quality control procedures have been developed through years of experience collecting and processing deepwater OBN data. All quality control and data validation is performed utilizing FairfieldNodal’s proprietary processing software.
Onboard quality control steps include:
- Collecting navigation files and building a preliminary source database;
- Validating receiver gathers from the recorder and computing processing trace headers;
- Compiling an inventory of all shots and receivers;
- Creating limited offset datasets for quality analysis
Node processing is a new specialty, around which FairfieldNodal has built a proprietary technology portfolio to not only handle the intrinsic differences of deepwater nodes but also to mitigate known and measureable obstacles to the repeatability of different vintages of OBN data. These processes and procedures safeguard 4D compliance and simplify 4D analysis and reservoir characterization.
Some of the unique challenges of node processing include:
- Autonomous node clock drift;
- Node and shot position uncertainty;
- Dynamic water column characterization;
- Wavefield separation and V(z) noise suppression;
- Directional designature.
With the Julia processing, great care has been taken to ensure that observed changes in the reservoir measured from future node surveys will be caused by production-related effects and not differences in acquisition and processing.
Node imaging: the right technology at the right time.
The Julia image is the payoff of our approach. Here, Z3000 provided the all offset, wide-azimuth, high quality and ultimately repeatable acquisition that is required for appraisal and in-fill drilling, reservoir characterization and 4D monitoring.
To produce this image, FairfieldNodal uses a complete and integrated set of proprietary earth-model building and imaging tools, including TTI reverse-time migration. Model updates use angle domain common image gathers (ADCIG) generated from a patented process that features band-limited sinc functions to map image traces to the angle domain.