Seismic data processing is the second stage in seismic survey analysis. It does overlap with the first stage, data acquisition, but is dependent on very stringent quality control to adequately prepare for the third stage, interpretation. Processing seismic data isn’t as straightforward as turning on a switch, transmitting and receiving data streams, and assuming that the data will be clean and ready for interpretation.
To effectively read and use the data in seismic surveys, seismic data interpreters must examine amplitudes, curves, and trends. These are the end goals of data collection in a seismic survey. On the other hand, the Processing QCs’ objectives are to produce “flat” curves in the data stack by mitigating artefacts through attenuation within the signals. The QC also ensures that the interpreters’ data is clean by amplifying seismic signals that have attenuated due to the earth’s curvature. Ultimately, the primary outcome for both the processor and the interpreter is the generation of high-quality seismic data. Verif-i QC Processing contractors have the requisite geophysics background for seismic processing and the knowledge and experience needed for effective data collection.
Before the survey
The major task for the Verif-i Processing QC is to produce the best possible data within environmental, time and budget constraints. This challenge can only be met by understanding the goals of the client. Verif-i QC Processors are well-versed in the difficulties that emerge within seismic surveys and know how to extract the key data processing objectives from pre-survey meetings. They know what questions to ask and are fluent in addressing the client’s concerns. The engagement of the Verif-i Processing QC contractors at this point familiarises them with all members of the team and their goals, enabling them to remain focused on the principal objectives throughout the data processing project.
Testing and timing schedules
Seismic data processing involves multiple stages. The quality of each stage can be hampered by time constraints. Verif-i Processing QCs will advise about the best options for pre-stack or post-stack migration and automation options for software conversions that will be complicit with timing schedules. These processes typically involve thorough parameter testing, depending on the client’s objectives and the geometry of the survey location. The competence of our professional Processing QCs in selecting the appropriate parameters assists in the design of pre-processing schedules.
Involvement in tender invitations and responses
Each stage of a seismic audit’s data processing project is mirrored in the tender invitation document. The data processing QC contractors’ contributions to tender documentation and to analysing responses are critical in mapping out a route towards processing seismic data QC. In particular, the processing QC’s input is required in the following sections, and includes evaluating responses according to the criteria within these sections:
- Outline of the project’s scope together with detailed steps of the processing stages in their correct order.
- Qualifications and the particular experience of team members.
- Availability and conditions of required technological facilities, including equipment and software.
Why Quality Control is so vital
Without both acquisition and processing QC in seismic data analysis, the mission’s entire purpose can be invalidated. When the ultimate goal is data interpretation, processing seismic data QC must run the show. Depending on the survey’s objectives, data interpreters will need visuals of highly specialised data, based on the chosen parameters influencing the survey and the seismic attributes that they define. Every asset on the mission must pass muster. All equipment used for sourcing, recording and then formatting the data must be in top condition or easily replaceable and must be well-suited to the goals and location of the project. The crew members’ training and experience must be appropriate for the survey’s objectives.
Consequently, the Verif-i Processing QC carries a significant amount of responsibility for the mission’s success.