Transverse Variable H-V Curve Construction for Seismic Velocity Fields
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Solution Overview
Problem
Current methods for constructing seismic wave velocity fields in petroleum geophysical exploration are inaccurate due to reliance on interpreter experience and fail to account for transverse variations in velocity, leading to inconsistent results and difficulty in achieving a well-constrained transverse variable H-V curve.
Innovation Solution
A method involving calculating interval velocities at well locations, using acoustic logging and drilling data to fit a first-degree function describing velocity-depth relationships, and applying Kriging interpolation to create a well-constrained transverse variable H-V curve, ensuring consistency with drilling results and seismic velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If interpreter experience is used to summarize seismic velocity, logging and VSP data, then the method is flexible and adaptable, but the workload is very heavy and results vary greatly between different interpreters
Solution Approach 1:
The patent replaces the manual mechanical process of interpreter experience-based summarization with an automated computer-based system. The system uses algorithms to automatically integrate seismic data, logging data, and VSP data to construct velocity fields, eliminating the need for manual interpretation while maintaining adaptability to different geological conditions.
Solution Approach 2:
The system enables self-service by automatically processing and integrating multiple data sources without requiring manual intervention. The computer-based system autonomously performs data integration, velocity analysis, and H-V curve construction, reducing human workload while ensuring consistent results.
2Device complexity
If traditional methods are used to construct velocity fields, then the process is simpler, but the accuracy of average velocity field cannot be guaranteed due to multiple affecting factors
Solution Approach 1:
The patent merges multiple data sources including seismic data, logging data, and VSP data into a unified velocity field construction process. By integrating these complementary data types, the system achieves higher accuracy in average velocity field construction while accounting for multiple affecting factors that traditional single-source methods cannot address.
Solution Approach 2:
The system creates a composite velocity field model by combining information from different data sources and methodologies. This composite approach integrates seismic velocity analysis, logging velocity data, and VSP measurements to produce a more accurate and reliable average velocity field than any single method could achieve alone.
3Device complexity
If a single H-V curve is used for the entire survey area, then the construction process is simpler, but transverse variations in velocity are not accounted for leading to inconsistent results
Solution Approach 1:
The patent applies local quality by constructing separate H-V curves for different sub-areas within the survey region rather than using a single uniform curve. This allows the velocity model to reflect local transverse variations in geological conditions, improving consistency and reliability of the velocity field construction across the entire survey area.
Solution Approach 2:
The system segments the survey area into multiple sub-regions and constructs individual H-V curves for each segment. This segmentation approach enables the model to capture transverse velocity variations caused by different sedimentary facies and geological conditions in different areas, while maintaining overall model consistency through systematic integration.
Data Source
AI summary
A well constrained transverse variable height-velocity curve constructing method for seismic wave velocity field construction involves the steps of: a) calculating interval velocity of each stratum by a sonic logging curve, and calculating the conversion horizon velocity of each horizon; b) drawing a circle to collect well points; c) calculating the characteristic parameter values of the height-velocity curve by the interval velocity and the conversion interval velocity of each well; d) calculating the characteristic parameter values by Kriging interpolation.