Background

Since 2018 TNO and EBN jointly carry out the multiyear research program Seismische Campagne Aardwarmte Nederland, in short SCAN. The results of the SCAN project allow a better estimation of where in the Dutch subsurface there is potential for geothermal heat production. The main projects of the SCAN program concern seismic data acquisition in the field with modern techniques and the re-processing of existing seismic data of the Dutch subsurface. In the acquisition and reprocessing of data, an emphasis is placed on areas with a low data density.  By combining and further study of the results obtained from these projects, the knowledge on our subsurface is further increased. More information on the SCAN program can be obtained via the website scanaardwarmte.nl, whereas via the following NLOG-page all research data and final results of the different studies within SCAN are published.

Following the acquisition of new seismic data in the field, the resulting field data is processed into a seismic section. With regards to reprocessing of existing seismic data, old field data is checked and processed into a new seismic section using modern techniques. For lines for which the process is completed, both the final processed seismic section and the availability of the field data are published below. The following document gives an overview of the data that becomes available from all SCAN-projects. These seismic sections can be viewed in free viewers such as Seisee or SeismiGraphix. An overview of the ongoing and planned activities within the project can be found on scanaardwarmte.nl.

Newly Acquired Seismic Data

Locations

For the lines below acquired data is available from SCAN or from related activities (such as those for the Program on Ultradeep Geothermal Energy). The locations of the lines can be seen via the following webpage.

Data

The final results of the newly acquired seismic data are the processed seismic sections with velocities and processing report. These can be downloaded from the table below. The field data for all lines listed in the table below can be requested by contacting the Servicedesk, unless it has been indicated that the field data is not yet available. TNO charges a service fee for the handling of the request and final delivery of the field data is via a file transfer service.

EBN has performed a seismic inversion study for the following lines: 1, 11, 24, 25, 36, 37, 38, 39, 40, 55, 56, 57.
The resulting data set can be downloaded here: Seismische inversion study

In addition to the data above the following data types can be requested from EBN via info@scanaardwarmte.nl:

a.    Pre-processed gathers prior to Pre-Stack Time Migration
b.    Raw Pre-Stack Time Migration gathers
c.    Final Pre-Stack Time Migration gathers
 

3D Cross-spreads en 2D Widelines

During the national seismic campaign, the SCAN programme made use of mainly 2-dimensional lines for their seismic imaging. This is the most cost-efficient way to collect a lot of information for a large area. However, 2D seismic imaging often isn’t sufficient to prepare for a (research) drilling and find a suitable location. A 3-dimensional seismic survey can provide better insight. However, 3D seismic is very expensive. That is why SCAN has investigated two other options for designing the collection of the seismic data.
 
In the 'widelines' method, an additional 2D seismic line is constructed based on data from two parallel lines that run close to each other. The signals from one line are also recorded on the othe line, and vice versa. The 'cross-spread' method consists of two or more 2D lines that cross each other at right or oblique angles. Here signals from the shots on lines are also registered on the other lines and vice versa, creating a simple 3D image around the intersections of the lines. Both methods proved successful and can provide the necessary data at a fraction of the cost of a 3D survey or a dense 2D raster. It was concluded that the widelines and cross-spread method have therefore proven to be very useful for the SCAN programme.

For more information regarding wide-lines en cross-spreads: SCAN Special Seismic Products: 3D Cross-spreads and 2D Widelines

The resulting seismic data:

Acquisition Parameters

As part of the acquisition of new seismic data of the subsurface for SCAN, a test line of approx. 29 km between Utrecht and Almere has been recorded in 2019. With the Test Line is determined how to efficiently manage and perform the new acquisition. The test line partially overlaps with the NAM-DEEP line, this one of the few existing seismic lines with the specific purpose to acquire data of the deep subsurface. The aim of the SCAN test line was to gather data of at least a comparable quality. This goal has been achieved: the test line is of very good quality and the deep layers are visible.

In total, 1355 shots were registered with 5817 channels per shot and an offset ranging from 10 meters to 10’s of kilometers. Data was recorded by vertical single geophones spaced 5 meters apart with a 2 millisecond sample interval and a record length of 20 seconds (10001 samples per trace).

With the applied long offset 2D seismics it is expected that it is possible to look deeper in the subsurface compared to industry standard techniques.

Acquisition parameters Test Line

On the basis of the test line results the acquisition parameters of the subsequent lines were selected:
 

Acquisition parameters of lines other than Test Line

Reprocessed Seismic Data

An up to date overview, maps and deliverables of the ongoing and completed SCAN work packages which focus on reprocessing of seismic data can be found via the SCAN programme webpage. The currently available reprocessed seismic data can be downloaded using the links in the section below.

1 Mobil   GTO-18-C004
24 Lines located in SCAN Area C have been reprocessed. The lines are part of five Mobil surveys from the 1980’s and cover a total length of 315 kilometers. The original data has been reprocessed and the resulting seismic sections are available for download in the table below.

2 NAM DEEP   GTO-19-C011
The NAM-DEEP lines are 2 long regional lines from the surveys L2NAM1982F and L2NAM1984N that acquired in a line from the NE to SE of the Netherlands and with a total length of 268 km. The original data has been reprocessed and the resulting seismic sections are available for download in the table below.

3 Mobil/NAM   GTO-19-C033-01
This package consists of 44 relatively short lines of 3 to 19 kilometers reprocessed data from seismic surveys from the area between Haarlem and Nijmegen with a total length of 412 kilometers. These lines originate from six seismic surveys from the 1980s conducted by Mobil, and from a 1974 NAM survey. The original data has been reprocessed and the resulting seismic sections are available for download in the table below.

4 Petroland   GTO-19-C033-02
This work package consists of 51 lines from seismic surveys acquired in the provinces of Utrecht, Flevoland and Gelderland. It comprises a total of approximately 774 kilometers of reprocessed data averaging at 15 kilometers per line. The lines are from seismic surveys conducted by Petroland in the 1980s. The original field data has been reprocessed and the resulting seismic sections are available below.

5 NAM Zeeland   GTO-19-C032-01
This work package includes lines from seismic surveys conducted by NAM in the 1970’s and 1980’s in the province of Zeeland (SCAN D) and the westernmost part of the province of Noord-Brabant (SCAN E west). This concerns a total of approximately 974 kilometers of reprocessed data, spread over 56 lines with an average line length of 17 km. The original data has been reprocessed and the resulting seismic sections are available for download in the table below.

6 Flevoland Waterland   GTO-19-C032-03
This work package contains lines from seismic surveys conducted by NAM in the 1970’s and 1980’s in the northern part of the province of Flevoland (SCAN A), including the Noordoostpolder (SCAN I), and the Waterland area northwest of Amsterdam (SCAN C). This involves a total of approximately 690 kilometers of reprocessed data, spread over 37 lines with an average line length of 19 km. The original data has been reprocessed and the resulting seismic sections are available for download in the table below.

7 Brabant Oost   GTO-19-C033-03
This work package contains lines from seismic surveys conducted by BP and Californië in the eastern part of the province of Noord-Brabant and in the northern part of the province of Limburg. This involves a total of approximately 600 kilometers of reprocessed data, spread over 28 lines with an average line length of 21 km.
 

8 Brabant Salland   GTO-19-C033-04
This work package contains lines from seismic surveys conducted by BP, Clyde, NAM, Petroland and Vito in the western part of the province of Noord-Brabant, and in and around the Salland region in the province of Overijssel. This involves a total of at least 700 kilometers of reprocessed data, spread over 41 lines with an average line length of 19 km.

9 Holland Twente   GTO-19-C032-04
This work package consists of 55 lines with an average length of 16 kilometers. The lines have a total length of 900 kilometers. The lines are located in West-Friesland and partly in the kop van Noord-Holland, the Twente region and in the area between the municipalities of Woerden and Alphen aan den Rijn. The data comes from seismic surveys that were commissioned by NAM and Petroland in the 1970s and ‘80s. The original data has been reprocessed and the resulting seismic sections are available below.

10 Brabant C-plus   GTO-19-C033-05
This work package consists of 67 lines with an average length of 13 kilometers. The lines have a total length of 880 kilometers. The lines are mainly located in the SCAN research area C (Utrecht, southern North Holland and parts of Gelderland), in Overijssel, North Brabant and the north of the province of Limburg. The data was gathered from seismic surveys that were commissioned by BP, Clyde, Mobil, NAM en Petroland between 1970 and 1990. The original data has been reprocessed and the resulting seismic sections are available below.

11 IJsselmeer B-plus   GTO-19-C032-05
This work package consists of 46 lines with an average length of almost 19 kilometers. The lines have a total length of 863 kilometers. The lines are located in the northern part of Flevoland, some in West Friesland, north of Amsterdam, the Rotterdam port area and in the Achterhoek. The data was gathered from seismic surveys that were commissioned by NAM and Petroland between 1970 and 1988. The original data has been reprocessed and the resulting seismic sections are available below.

Data

Apart from the seismic data available for download in the table below. The field data has been checked and reconstructed during reprocessing and can be requested by contacting the Servicedesk.