Schlumberger

Shallow Hazard Assessment

Pre-Drill seismic assessment of drilling hazards is an essential part of the well planning process

The shallow hazard assessment service is available worldwide and, as its base deliverable, provides an analysis designed to meet the US Minerals Management Service (MMS) shallow hazard requirements for delineation of both geologic and artificial shallow hazard features affecting exploration and development drilling operations.

Included in the assessment is a structural and stratigraphic interpretation of 3D seismic data to qualitatively delineate abnormal pressure zones, shallow gas, seafloor stability, shallow water flow, and gas hydrates.

The objective of the shallow hazard assessment is to identify, map, and delineate seafloor, shallow subsurface geologic, and constructed features that may impact proposed oil and gas operations. These include

  • seafloor geologic hazards such as fault scarps, gas vents, unstable slopes, and reefs
  • shallow subsurface geologic hazards such as faults, gas charged sediments, buried channels, and abnormal pressure zones
  • synthetic hazards such as pipelines, wellheads, shipwrecks, and debris from oil and gas operations.

In addition, a proposed wellsite analysis is carried out to identify and map geologic features in the vicinity of proposed wells, platforms, anchors and anchor chains, mounds or knolls, acoustic void zones, gas- or oil-charged sediments, or seeps associated with surface faulting that may be indicative of ocean-bottom chemosynthetic communities.

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