Shallow Geohazard Assessments

Offshore drilling location shallow geohazard assessments are a critical stage in the well-planning process. While this activity comes with its own challenges, the rationale of getting this right for safe drilling operations cannot be overstated.


Geohazards, as applied to drilling locations, cannot be prevented, but most can be avoided through a detailed understanding of the sub-surface data and interpretation and quantification of the associated risks.

Where a geohazard cannot be avoided, mitigation must take place to reduce the risk to ALARP levels.

The geohazard, drilling and reservoir expertise across the Vysus Group means we can determine effective solutions across the project life cycle and ensures that we always have the necessary specialist expertise to draw upon.

Service Breakdown

Integration and regional/preliminary assessment

Client supplied and relevant public data are integrated to gain an understanding of the geological and geohazard complexities within a licence block. Combining 3D seismic data is key to fully understanding any site; these regional insights will shape more detailed analysis required at proposed drilling and relief locations.

Site survey strategy

A data-gap analysis is carried out, guiding the design of the site-survey for the drilling location. This ensures all necessary data are acquired to allow clearance of the well whilst also delivering the most cost-effective solution. This process can be extended to cover the project’s full exploration, development and production lifecycle.

Data re-processing

Advanced re-processing of seismic data using the latest 3D technologies to enhance the resolution within top-hole section can save significant costs on subsequent site surveys, while delivering enhanced results. Re-processing often leads to improved data quality and fidelity, optimising seismic interpretations.

Detailed shallow geohazard assessment

The geohazard assessment can then be completed at the proposed well location. All information from the latest survey is combined with seismic re-processing results and geotechnical investigations, together with the proposed well plan and rig data. A report is generated identifying risks at veracious levels together with proposed mitigations.


Shallow geohazard assessments support oil and gas activities in numerous ways, including:

  • Applying for permits and optimising well locations
  • Placing rigs, wells and other seabed infrastructure on the seabed
  • Streamlining the top-hole drilling and casing process
  • Protecting personnel and the environment from hydrocarbon incidents or accidents