Data conditioning of 4D seismic timelapse data for improved inversion of reservoir pressure and saturation

Recent progress in 4D seismic history matching benefits greatly from the use of 4D seismic timelapse data. Several methods for inversion of 4D seismic timelapse data for reservoir pressure and saturation have been developed with mixed success. Most of these methods work well on synthetic data or real data with low noise levels, but degrade in...

Detailed seismic modeling of induced seismicity at the Groningen gas field

We present the results of a detailed seismic modeling study of induced seismicity observed at the Groningen gas field, situated in the North-eastern part of the Netherlands. Seismic simulations are valuable to support the interpretation of observed earthquake waveforms recordings and to increase the understanding of the underlying source...

Passive seismic monitoring at the ketzin CCS site -Magnitude estimation

In order to allow quantification of the strength of local micro-seismic events recorded at the CCS pilot site in Ketzin in terms of local magnitude, earthquake data recorded by standardized seismometers were used. Earthquakes were selected that occurred in Poland and Czech Republic and that were detected both on the Ketzin array and on nearby...

Four years of experience with a permanent seismic monitoring array at the Ketzin CO2 storage pilot site

CO2 was injected into a saline aquifer near the town of Ketzin in Germany from July 2008 to August 2013. To monitor CO2- migration close to the injection well, TNO installed a fixed 2D seismic array of 120 meters length in 2009, with 3- component (3- C) geophones at the surface, 4-component receivers at 50 meters depth and a central vertical...

The Role of Feature Enhanced Processing for Automatic Target Recognition using High Resolution Polarimetric SAR Data

We have studied the effect of feature enhanced processing on the discrimination of targets in highresolution polarimetric ISAR and SAR images. This is done by comparing feature-based classification results for original images and images which have been pre-processed to enhance target features. The data comprised four military targets: T72, ZSU23...

Detection of Small Floating Targets with Low Cost Radar Systems

Improving small target detection in sea clutter is an important step towards making radar a more effective tool for coastal surveillance and infrastructure protection. Terrorist attacks at sea or coming from sea can be expected to be carried out with small boats or jet-ski’s under cover of darkness of under conditions of low visibility. Under...

Concepts for monitoring and surveillance using Space borne SAR systems

In this paper we introduce a concept for monitoring and surveillance based on SAR imagery. A workflow for detection and characterization of changes is presented and discussed. SAR imagery is quite efficient for detection of changes, but less adequate for characterization of the changes. For this purpose context information can be used or...

Target Acquisition Performance as a Function of Resolution using Radar Change Detection

Results from a study for ground surveillance with synthetic aperture radar (SAR) are presented. In particular change detection performance as a function of resolution and target size is investigated using simulated and measured SAR data. For the simulation five homogeneous target sets with sizes varying from one to eight meter have been used and...

Application of radon transforms and time-frequency representations to ISAR imagery

The use of ISAR imagery for Automatic Target Recognition is seriously hampered by the difficulty of target motion compensation. Phase perturbations that result from target maneuvers during the processing interval need to be corrected for. In a previous paper, we demonstrated the use of the local Radon transform for estimating the radial velocity...

Demonstration MTI/SAR capability

The aim of this project is to demonstrate to the Dutch armed forces the capability of MTI (Moving Target Indicator) and SAR (Synthetic Aperture Radar). This is done with the Dutch PHARUS sensor. The sensor is used to demonstrate how a phased array antenna can be used as an MTI/SAR sensor combination. The advantage of such a system is its...

MiniSAR: A miniature, lightweight, low cost, scalable SAR system

TNO-FEL is developing a miniature, lightweight, low cost, and scalable SAR/MTI system called 'MiniSAR'. The MiniSAR system will be unique in its size and architecture. Initially the demonstrator system will be integrated in a two-seater motorglider platform. Wherever possible, commercial-off-the-shelf (COTS) products are being used. This paper...