Variable Weight Dynamite Charges for Seismic Frequency Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Onshore seismic acquisition using dynamite as an energy source lacks control over frequency increment, making it challenging to achieve high-quality seismic imaging due to instantaneous chemical reactions and uncontrolled wave generation.
Innovation Solution
The method involves distributing and arranging explosive charges with unique weights at separate shot points, allowing for individual firing and recording of seismic waves with distinct frequency content. These records are then processed and stacked to enhance the frequency complementarity, resulting in improved seismic section resolution and continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If dynamite is used as an energy source for onshore seismic acquisition, then seismic waves are generated through chemical reactions, but control over frequency increment is lost
Solution Approach 1:
The patent segments the seismic energy source into multiple dynamite charges with different weights (e.g., 1kg, 0.5kg, 0.25kg, 0.125kg) instead of using a single uniform charge. Each charge weight generates seismic waves with distinct frequency content, allowing the acquisition system to obtain a broader and more controlled frequency spectrum by combining records from charges of varying weights.
2Ease of manufacture
If uniform charges are used at all shot points, then acquisition process is simplified, but frequency content diversity is reduced
Solution Approach 1:
The patent applies local quality by assigning different charge weights to different shot points based on specific acquisition needs. Instead of uniform charges throughout, the system strategically distributes charges of varying weights (1kg, 0.5kg, 0.25kg, 0.125kg) across the seismic line, with each location receiving a charge weight optimized for the local geological conditions and frequency requirements.
3Loss of information
If multiple charges with different weights are used, then frequency content is expanded, but device complexity increases
Solution Approach 1:
The patent implements periodic action by following a systematic pattern in distributing different charge weights along the seismic line. The charge weights follow a sequential pattern (e.g., 1kg, 0.5kg, 0.25kg, 0.125kg) that can be repeated across multiple shot points, providing a structured and repeatable approach to frequency diversification that reduces operational complexity compared to random or ad-hoc charge selection.
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 significantly enhances the quality of seismic data by incrementally expanding the frequency content, leading to better resolution and continuity of reflectors and geological discontinuities, thereby reducing geological uncertainties.
Implementation Method 1
The use of sources such as dynamite makes it impossible to control these abovementioned parameters, since the chemical reaction and wave generation is instantaneous
Implementation Method 2
Hydraulic vibrators are equipment capable of producing acoustic waves from piston impacts against the ground
Implementation Method 3
Upon recording the amplitude and transit time that a reflected wave takes to travel in the subsurface, reflecting on geological interfaces and returning to the receiver
Data Source
AI summary
The present invention pertains to the fields of geology and geophysics, is designed for use for onshore seismic acquisition. The method involves distributing and arranging the elements used in the acquisition of two-dimensional seismic data from dynamite sources, enabling imaging quality to be improved. The use of sources of dynamite with single charges and variable weight at each shot point results in the generation of seismic waves with variable energy that provide reflections with complementary frequency and amplitudes content for use in the geophysical imaging of geological features. The stacking of this incremental content generated by charges of variable weights results in a significant improvement in the resolution of the processed seismic data on both the continuity of stratigraphic reflectors and existing geological framework.