Multi-Wellbore Seismic Profiling for Fracture Network Mapping
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Solution Overview
Problem
Current seismic imaging techniques for subterranean formations face challenges in achieving high-resolution, real-time monitoring and analysis of fracture treatments in unconventional reservoirs, particularly in accurately mapping fracture networks and reservoir properties.
Innovation Solution
A multi-wellbore seismic profiling system that uses arrays of seismic sources and sensors within horizontal wellbores to generate and detect seismic waves, allowing for high-resolution, time-lapse imaging and real-time data analysis to construct detailed models of fracture networks and reservoir properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional seismic imaging techniques are used, then geological information can be obtained, but high-resolution real-time monitoring and accurate mapping of fracture networks cannot be achieved
Solution Approach 1:
The patent divides the monitoring system into multiple distributed seismic sources and sensors positioned along different wellbores. This segmentation allows for high-resolution, localized measurements of fracture propagation in real-time, overcoming the limitations of conventional single-point seismic imaging.
Solution Approach 2:
The patent transitions from conventional 2D surface seismic imaging to 3D/4D cross-well seismic monitoring by placing sources and sensors within the subsurface wellbores. This dimensional change enables precise spatial mapping of fracture networks and real-time monitoring of treatment progression.
2Loss of information
If conventional single-wellbore seismic detection is used, then basic geological information can be obtained, but detailed fracture network characterization and stimulated reservoir volume assessment are insufficient
Solution Approach 1:
The patent combines seismic sources and sensors across multiple wellbores into an integrated monitoring system. This merging of detection points throughout the reservoir enables comprehensive fracture network characterization and complete stimulated reservoir volume assessment, justifying the increased system complexity.
Solution Approach 2:
The multi-wellbore seismic system serves multiple functions: characterizing fracture networks, assessing stimulated reservoir volume, monitoring treatment progression, and evaluating reservoir properties. This multi-functionality maximizes the value of the additional system complexity.
3Productivity
If traditional seismic imaging is used, then general subsurface structure can be visualized, but precise fracture treatment monitoring and control are not enabled
Solution Approach 1:
The patent implements real-time feedback by continuously monitoring seismic signals during fracture treatment and comparing them against predicted fracture propagation models. This enables precise treatment monitoring and control, allowing operators to adjust treatment parameters to optimize productivity.
Solution Approach 2:
The system performs preliminary seismic imaging before fracture treatment to establish baseline reservoir properties and fracture network characteristics. This preliminary action enables more accurate monitoring and control during the actual treatment process.
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
Enables precise monitoring and control of fracture treatments, improving the stimulated reservoir volume, reducing costs, and enhancing the accuracy of reservoir characterization and production forecasting.
Implementation Method 1
seismic waves are generated by an artificial seismic source at the ground surface, and reflected seismic waves are recorded by geophones
Data Source
AI summary
Some aspects of what is described here relate to seismic profiling techniques. A seismic excitation is generated in a first directional section of a first wellbore in a subterranean region. Seismic responses associated with the seismic excitation are detected in directional sections of a plurality of other wellbores in the subterranean region. A fracture treatment of the subterranean region is analyzed based on the seismic responses. In some instances, a multi-dimensional seismic velocity model of the subterranean region is generated based on the seismic responses.