tTEM metingen t.b.v. detecteren van een breuk nabij Boerdonk

TNO heeft opdracht gekregen van Koninklijke Smals NV voor het uitvoeren van onderzoek met de tTEM methode voor het detecteren van breuken in de ondergrond ten noorden Boerdonk. Smals is voornemens ter plaatse zand te winnen uit de Formatie van Beegden. In het gebied zijn in het verleden breuken gekarteerd, echter de precieze ligging en het...

tTEM: Een efficiente techniek voor 3D kartering van de ondergrond tot 60M diepte

De lithologische samenstelling van de ondergrond is van belang voor verschillende geotechnische en hydrologische toepassingen. Zo is de ligging en kennis over de continuïteit van kleilagen in de bovenste 60m vaak cruciaal om doelgerichte maatregelen te ontwerpen. Met de nieuwe tTEM kan de opbouw van de ondergrond snel in beeld worden gebracht.

A Neural Network Approach for Improved Seismic Event Detection in the Groningen Gas Field, The Netherlands. Preprint

Over the past decades, the Groningen Gas Field (GGF) has been increasingly faced by induced earthquakes resulting from gas production. The seismic monitoring network at Groningen has been recently densified to improve the seismic network performance, resulting in increasing amounts of seismic data. Although traditional automated event detection...

Suppressing ground roll, P-S Conversions and out-of-plane scattering in near surface seismic data using 3C polarization

Multiple approaches have been employed in the past to filter ground roll in near surface seismic data. Although many seismic surveys nowadays are currently recorded with three-component (3C) receivers, older filters are usually designed for one-component (1C) data. Invoking two additional spatial dimensions with orthogonal components of particle...

Identifying risked potential of seals and flow in ultradeep and shallow geothermal reservoirs

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...

High resolution 3D seismic survey off-shore the Netherlands

TNO has carried out a high resolution 3D seismic survey off-shore Rotterdam. The new deployment concept that was tested with this survey results in high-quality 3D images of the shallow subsurface at relatively low cost, particularly in comparison with conventional 3D seismic data acquisition. Initially, the pilot survey aims to demonstrate the...

Reconstructing North Sea palaeolandscapes from 3D and high-density 2D seismic data: An overview

The North Sea subsurface shows the marks of long-term tectonic subsidence. Much of it contains a thick record of glacial and interglacial deposits and landscapes, formed during multiple glacial cycles and the associated regressions and transgressions during the past two million years. At times of lower sea level than today, areas that are...

GHGT-11 - Experiences with a permanently installed seismic monitoring array at the CO2 storage site at Ketzin (Germany): A status overview

Since July 2008, CO2 is injected into a saline aquifer near the town of Ketzin in Germany. For monitoring the CO2-migration close to the injection well, TNO installed a fixed 2D seismic array of 120 meters length in 2009, with 3-component geophones at the surface, 4-component receivers at 50 meters depth and a central vertical array of 4...

Advancements in satellite gravity gradient data for crustal studies

In recent years, global gravity models, both based only on satellite data and from combination with terrestrial data, are increasingly available and particularly useful to construct regional models before more local interpretations on the exploration scale are carried out. Often it is challenging to distinguish clearly between near-surface and...

The first results of continuous passive surface seismic monitoring at the CO2 injection site of ketzin

Since July 2008 CO<inf>2</inf> is injected into a saline aquifer near Ketzin, in Germany. The reservoir used for CO<inf>2</inf> injection is the Stuttgart Formation of Triassic age, located at a depth of about 650 m. Close to the injection well, TNO designed and implemented a permanent shallow seismic monitoring system. The system consists of 3C...

Results of a monitoring pilot with a permanent buried multicomponent seismic array at Ketzin

To monitor the migration of the injected CO2 in the Ketzin project (Germany) a permanently buried multi-component seismic array has been installed in August 2009. Since then the array has been continuously recording passive seismic data. Additionally an active seismic survey resulting in a 230 m long 2D seismic line roughly passing over the...

Data quality of a low fold seismic survey employing a buried multi-component array at Ketzin

To monitor the migration of the injected CO2 in the Ketzin project (Germany) a permanently buried multi-component seismic array has been installed in August 2009. Besides passive seismic recordings, this monitoring system was used to record data for an active survey carried out in 2009, resulting in a 200 m long 2D seismic line roughly passing...

Computer modeling and laboratory experiments of a specific borehole to surface electrical monitoring technique (BSEMT)

Geophysical monitoring of the dynamical behavior of subsurface reservoirs (oil, gas, CO2) remains an important issue in geophysical research. A new idea for reservoir monitoring based on electrical resistivity tomography was developed at TNO. The essential element of the so-called BSEMT (Borehole to Surface Electrical Monitoring Technique)...

Passive seismic monitoring in two carbon sequestration sites, a data driven approach

Passive seismic imaging during CO2 injection in geological formations gains more and more interest as part of an integrated monitoring approach. For two EU CO2 storage project sites, RECOPOL - Enhanced Coal-Bed Methane pilot site in Kaniów (Poland) and CO2SINK- CO2 injection in a saline aquifer in Ketzin (Germany), the Netherlands Geological...

Advances in surface wave methods: Cascaded MASW-SASW

The application of the MASW method in areas that show strong lateral variations in subsurface properties is limited. Traditional SASW may yield a better lateral resolution but the dispersion curves (and thus the subsurface models) obtained with the method may be poor. The joint application of MASW and SASW is proposed to allow for a robust...