Discover how STRYDE's seismic sensors were used to acquire high-resolution seismic data required for mining exploration
Shanxi Coalfield Geophysical Survey Company
Luliang, Shanxi Province, China
Loess, mountains, farmland, and villages
Detect and characterise other structures relevant to mine planning, such as folds with amplitudes exceeding 10 m
Map the main coal seam subcrop with a depth uncertainty of less than 30m
Investigate whether faults in the main coal seam with throws exceeding 5 m can be interpreted accurately
Understand the thickness and velocity variation of the shallow low-velocity zone in the overburden
Identify the occurrence and thickness variation of minable coal seams in the exploration area
Precisely delimit the extent of coal free zones in the exploration area
6,000 STRYDE Nodes™
24 crew members
Vibroseis and dynamite
40 m receiver line spacing, 10 m receiver point spacing; 60 m source line spacing, 10 m source point spacing Production operating times: 24 hour vibroseis operations. Dynamite source points were only acquired during daytime
24 hour vibroseis operations. Dynamite source points were only acquired during daytime
870 nodes were deployed each day by 8 teams, consisting of 3 people per team
Only 2 people were required to perform all charging and data harvesting operations for the 6,000 STRYDE Nodes™ used in the survey
4 pickup trucks
The survey area is covered by Quaternary loess deposits, causing large lateral variations in surface and near-surface properties. Recorded signal quality and amplitude/frequency character in conventional surveys can vary significantly between adjacent traces due to differences in source and receiver coupling, amplification effects and the presence of low-velocity layers. Acquisition of high-resolution seismic data is required to adequately sample such effects and generate high quality interpretable images of the subsurface.
The project was conducted in mountainous terrain. Acquisition had to be completed before seasonal snow falls commenced, as seismic operations could not be conducted safely with snow and ice in the survey area. Hazards such as landslides and mud flows can occur during thaws and present a serious risk to personnel and equipment, so no seismic production is possible during such periods either.
There is goaf in part of the survey area, which was expected to negatively impact the quality of reflection data in that area. It was therefore critical to densify the survey in and around the goaf to improve the spatial sampling of the wavefield and output image quality.
The survey design was constrained by exclusion zones in and around local villages and needed to satisfy local government permitting requirements.
The STRYDE Nimble system was used for this project. Two Nest Cases were supplied, enabling 180 Nodes to be charged and harvested simultaneously. A total of 6,000 STRYDE Nodes™ were used on the project.
Field equipment for efficient stakeless Node deployment and retrieval was also supplied: the STRYDE Navigator Tablet and App for field positioning; Initialisation Devices for starting and stopping data acquisition; and ergonomic Backpacks for easy transportation of Nodes and peripherals by foot.
Raw seismic data required to process into 3D images for data interpretation and reporting.
About 336,000,000.00 traces of data was acquired
The node’s compact weight and size, combined with stakeless operations using STRYDE’s state-of-the-art Navigator Tablet and App, enabled extremely efficient node deployment and retrieval operations and allowed the overall project timeline to be accelerated, even in challenging terrain.
The STRYDE system has transformed the price point of land seismic equipment relative to the cost of conventional seismic instruments. Furthermore, the ability to deploy the miniature nodes quickly meant planning, preparation, and logistical overheads were greatly reduced, unlocking further cost savings and efficiency gains.
Being able to carry hundreds of nodes by foot, and thousands in small pickup trucks meant logistical requirements for the project were significantly reduced, reducing exposure to HSE risk and enabling the team to deploy and retrieve Nodes quickly and safely in mountainous areas.
Dense point-sensor acquisition with STRYDE’s piezoelectric accelerometer sensor resulted in high quality, high fold data, with rich high-frequency content.
Providing access to STRYDE’s seismic sensors within 1 week of project approval ensured the team was able to align the project with the mine’s operational plan and exceeded expectations about the survey timeline.
The simplicity of the STRYDE system means that it is extremely easy to use and is even accessible to people with no previous seismic experience. The team required only a couple of hours of training to onboard them to the system prior to deployment operations commencing. This allowed the team to start up efficiently and effectively, with minimal operator deployment and retrieval errors.