Real-time In-situ Seismic Imaging (RISI) is a breakthrough technology for monitoring and mapping the subsurface geophysical structures and dynamics in real-time. A RISI system is a wireless seismic network that senses and processes seismic signals, and computes 3D undersurface structures in-situ in real-time. Instead of collecting data to a central place for post-processing, the distributed seismic data processing and tomographic computing are performed in the in-situ network and the evolving 3D image is computed and delivered in real-time for visualization.
The RISI system, as a surface microseismic monitoring system, can detect the naturally occurring, low-energy seismic noise emitted from a reservoir during hydraulic fracturing stimulation, and provide real-time awareness (in less than a second) of hydraulic fracture operations in unconventional oil and gas plays.
At present, for seismic imaging, the seismic data is digitized and stored in local SD-card/ hard-disk at each station, then manually retrieved to a central server for post processing and seismic imaging. The whole process may take months to complete and the deployment and maintenance cost is very high. On the sharp contrast, the RISI system significantly reduces the whole process from months/days to seconds, and its deployment and maintenance costs are near zero, because a RISI system is autonomous, self-healing and self-sustainable, and requires no interventions during operations. Each RISI station equips smart energy management module with solar panel and rechargeable battery for perpetual lifetime, and smart in-situ computing and networking techniques that distributes the tomographic inversion computing load among all the stations under the bandwidth and energy resource constrains of the network.
The RISI system can be extended as a general field instrumentation platform, and incorporate new geophysical data processing and imaging algorithms, beyond seismic. It can be applied to a wide range of geophysical exploration topics such as hydrothermal, oil exploration, mining safety, mining resource monitoring.
|Computing and Storage||1GHz CPU, 512MB RAM, 32GB storage|
|Wireless Radio||900MHz, 200kbps, 24 dBm, max 6 miles|
|Solar Panel||5V, 5-10 Watt|
|Digitizer and GPS||time ±1 us, location ±1 meter|
|Rechargeable Battery||5V, 10 Ah|
|Dimension||8” (L) x 6” (W) x 4” (H)|
KEY FEATURES AND BENEFITS
- Real-time monitoring and imaging. RISI is a breakthrough technology for monitoring and mapping the subsurface geophysical structures and dynamics in real time. Instead of collecting data to a central place for post-processing, distributed seismic processing and imaging algorithms are performed in the in-situ network in real-time to generate the evolving 3D seismic image for visualization.
- High-resolution and scalable. The data processing algorithm can detect tiny events and, and tomographic inversion computing will calculate the highest resolution image based on number of received events. With larger number of stations, the RISI system can self-adjust to compute higher resolution images with higher accuracy.
- Reduce cost and risk of E&P process. As the first system that can provide real-time (in less than a second) monitoring of the uncertainty inherent to the Exploration and Production (E&P) process, it helps oil and gas companies understand how the reservoir responds to stimulation and its impact on customer economics, and reduce operation cost and mitigate environmental risks.
- Plug-and-play and autonomous. The deployment is simply plug-and-play and takes only 10 seconds per station to deploy. The RISI stations will self-form a mesh network for autonomous sensing, communication and computing. Stations can be added to form larger systems (or removed to form smaller systems) with little interruptions to current processes.
- Near-zero maintenance. A RISI system is self-healing and self-sustainable, and requires no interventions during operations. Each RISI station equips smart energy management modules including a solar panel and rechargeable battery and achieves perpetual lifetime under normal weather conditions.
- Add-on values to existing systems. The RISI system can also be custom built with some commercial data loggers such as Sigma seismic acquisition boxes. The wireless and computing units can be simply plugged in to form a RISI system.