Spectraseis provides operators with a complete, end-to-end solution for low frequency data from acquisition systems through to processing and analysis.

Flexible survey design

LF passive seismic acquisition geometry is very adaptable and measurements can be made along lines or on an irregular grid or mesh. The single-point measurement technique allows great flexibility of the survey design. LF passive seismic data is typically acquired with a node spacing of 250 meters to 2000 meters, depending on the
application. Measurement point distribution is adaptable over the surveyed area according to field constraints. Best results are obtained with long lines (30 to 60 km) of
synchronously acquired data.

The survey layout depends on the specific challenges: tighter node spacing increases the resolution; and wider spacing allows fast coverage of large areas. Unique to LF passive seismic, survey scope and resolution can be adjusted during acquisition. The field layout can also be optimized during the survey.

Field operations

LF field operations are fast (500 km2 can be acquired in two weeks with 50 sensors) and require light logistics and small crews. Equipment is portable and transported to the field in 4WD vehicles. Measurement locations can then be accessed by foot. Each vehicle is managed by a team which consists of a specialized crew of 3 to 4 people. Each team can manage 5 to 10 stations for a standard recording time of 24 hours.

Quality control

First level quality control and organization of the data is conducted in the field to maximize quality and consistency. Then the data is transmitted to Spectraseis’ processing and analysis center. Here a proprietary software system is set up to provide rapid – overnight – analysis feedback for potential re-measurement decision in the field.