Chirp Data Acquisition System Preserving Polarity and Phase
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Solution Overview
Problem
Current marine seismic exploration systems for profiling shallow sedimentary layers either sacrifice resolution for better transmission or vice versa, and existing chirp data acquisition methods disregard polarity and phase information, limiting the accuracy and reliability of sedimentary layer analysis.
Innovation Solution
A system comprising a transducer, hydrophone, and dual controllers that record and process chirp data to preserve polarity and phase information, enhancing resolution and applicability by correlating raw data with sweep signatures and applying inverse filters, while also implementing equal distance shooting to improve data reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the frequency of the seismic source is increased to improve resolution, then the resolution of data becomes higher, but the transmission of the sedimentary layers becomes more difficult
Solution Approach 1:
The patent employs frequency modulation (chirp signal) to dynamically change the frequency parameter of the seismic source over time. This allows the system to transmit low-frequency components for better penetration through sedimentary layers while simultaneously acquiring high-frequency components for high-resolution data, effectively resolving the contradiction between transmission reliability and measurement precision.
Solution Approach 2:
The chirp signal uses periodic frequency sweeping from low to high frequencies over a defined pulse duration (20-50 ms). This periodic frequency variation enables the system to sequentially achieve both good transmission (low frequency phase) and high resolution (high frequency phase) within a single pulse, eliminating the need to choose between the two parameters.
2Ease of operation
If the envelope display method is used to simplify analysis, then easiness of analysis is improved, but polarity and phase information is lost
Solution Approach 1:
The patent segments the data processing into multiple pathways: one pathway creates the envelope display for easy analysis of amplitude and depth, while another pathway preserves and processes the original raw data with polarity and phase information. This segmentation allows users to access both simplified envelope data and complete raw data without interference, eliminating information loss while maintaining ease of analysis.
Solution Approach 2:
The patent introduces an intermediary data storage and processing system that maintains the original chirp raw data alongside the envelope display. This intermediary layer ensures that polarity and phase information are not lost during the envelope creation process, allowing users to access complete information when needed while enjoying the simplicity of envelope display for routine analysis.
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
The system achieves high-resolution chirp data with preserved polarity and phase information, improving the accuracy and reliability of sedimentary layer profiling, enabling better differentiation of interfaces and continuity of reflection events.
Implementation Method 1
a transducer transmitting a chirp source
Implementation Method 2
a hydrophone receiving a signal returning by reflecting the chirp source transmitted from the transducer from a sub-bottom interface
Implementation Method 3
a hydrophone receiving a signal returning by reflecting the chirp source transmitted from the transducer from a sub-bottom interface
Implementation Method 4
computing the received data to manufacture a high-resolution raw chirp section preserving polarity and phase information
Data Source
AI summary
Provided are a system for acquiring chirp data for profiling the shallow sedimentary layers and a method for acquiring chirp data using the same, and more particularly, a system for acquiring chirp data which includes a new apparatus capable of recording chirp raw data and manufactures a high-resolution raw section preserving polarity and phase information using the recorded chirp raw data to enhance continuity and resolution of the sedimentary layers and a method for acquiring chirp data using the same.