Seismic Streamer Cable Bending Stiffness for Noise Aliasing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Seismic streamer systems in marine surveys face challenges in separating seismic signals from vibration noise, particularly in deep water environments, due to the sensitivity of particle motion sensors to vibration noise, which can alias into the signal and limit sensor spacing and data quality.
Innovation Solution
The seismic streamer platform is designed with a cable having a specific bending stiffness that increases the propagating velocity of transverse waves, allowing for larger sensor spacing without aliasing vibration noise into the seismic signals, using multi-component seismic sensors that can detect pressure and particle motion, and optimizing the streamer design to separate vibration noise from seismic signals through increased bending stiffness and appropriate sensor placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If sensor spacing is increased to reduce data acquisition complexity, then device complexity is reduced, but vibration noise aliases into seismic signals degrading measurement precision
Solution Approach 1:
The patent changes the physical parameter of cable bending stiffness to a specific value range (50-500 Nm²) to modify the vibration propagation characteristics. This parameter change increases the transverse wave velocity, which in turn increases the aliasing frequency, allowing for larger sensor spacing without aliasing vibration noise into the seismic signal band.
2Measurement precision
If cable bending stiffness is increased to increase transverse wave velocity, then vibration noise aliasing is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent specifies a quantitative range for the bending stiffness parameter (50-500 Nm²) that achieves the desired transverse wave velocity and aliasing frequency characteristics. This parameter optimization balances the need for vibration noise separation with manufacturing feasibility, avoiding excessive stiffness that would complicate the cable structure.
3Measurement precision
If transverse wave velocity is increased to raise aliasing frequency, then vibration noise aliasing is prevented, but use of energy and manufacturing cost increase
Solution Approach 1:
The patent identifies an optimal bending stiffness range (50-500 Nm²) that achieves sufficient transverse wave velocity to prevent aliasing while avoiding excessive values that would require higher cable tension and energy consumption. This parameter optimization balances aliasing prevention with energy efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables the acquisition of un-aliased seismic data by increasing the bending stiffness of the streamer cable, allowing for larger sensor spacing and improved separation of vibration noise from seismic signals, enhancing data quality and enabling deeper water surveys without aliasing issues.
Implementation Method 1
the cable has a bending stiffness that increases a propagating velocity of transverse waves along the cable
Data Source
AI summary
A technique includes designing a streamer, which includes a cable and seismic sensors based at least in part on a relationship between vibration noise and a bending stiffness of the cable.