Valhall dual-well 3D DAS VSP field trial and imaging for active wells

Jiang, Tao; Zhan, Ge; Hance, T.; Sugianto, Setiawardono; Soulas, S.; Kjos, E.

doi:10.1190/segam2016-13871754.1

Cited by 25 publications

(7 citation statements)

References 6 publications

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“…Application of DAS for CO 2 monitoring (Götz et al, 2018;Correa et al, 2019) is a well-known routine to provide a reliable method for targeted, detailed imaging and 4D monitoring of the site. 3D DAS VSP surveys in oil and gas exploration reduce exploration risks in regions with a challenging environment, for instance in the presence of strong production noise (Jiang et al, 2016) or in areas with complex salt tectonics (Bartels et al, 2015). In general, all the surveys with permanently installed fibre-optic cable have a better signal-to-noise ratio than data typically recorded with wireline DAS acquisition.…”

Section: The Groß Schönebeck Experimentsmentioning

confidence: 99%

“…Measurements with a fibre-optic cable installed along the casing or behind the tubing are widely and successfully applied for borehole seismic data acquisition. 3D vertical seismic profiling (VSP) imaging results with permanent cable installation include applications for oil and gas exploration (Jiang et al, 2016;Shultz and Simmons, 2019;Zhan and Nahm, 2020), the monitoring of CO 2 reservoirs (Humphries et al, 2015;Götz et al, 2018;Correa et al, 2019;Wilson et al, 2021), and mineral exploration and mining (Bellefleur et al, 2020). Nevertheless, in a vast number of already drilled and cased boreholes, only measurements with a wireline logging cable are feasible.…”

Section: Introductionmentioning

confidence: 99%

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3D deep geothermal reservoir imaging with wireline distributed acoustic sensing in two boreholes

et al. 2022

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Abstract. Geothermal exploration will help move towards a low-carbon economy and provide a basis for green and sustainable growth. The development of new practical, reliable methods for geophysical characterization of a reservoir has the potential to facilitate a broader application of deep geothermal energy. At the Groß Schönebeck in situ laboratory, a unique vertical seismic profiling (VSP) dataset was recorded in two 4.3 km deep geothermal boreholes using fibre-optic cables in early 2017. The experiment set-up consisted of 61 vibrator points organized in a spiral pattern around the well site to ensure a proper offset and azimuth distribution in the target reservoir section. Data were processed using a standard workflow for VSP. As a result, a detailed three-dimensional 0.75km×1km×4.5 km image around the existing boreholes was created using the Kirchhoff migration algorithm with restricted aperture. The imaging resolved small-scale features in the reservoir essential for the future exploration of the geothermal research site. Borehole data with vertical resolution up to 16 m revealed the existing depth variations of the Elbe reservoir sandstone horizon at 4.08–4.10 km depth and indications of an unconformity in the area where we expect volcanic rocks. In addition, in the borehole data a complex interlaying with numerous pinch-outs in the Upper Rotliegend reservoir section (3.8 to 4 km depth) was discovered. Thereby, we demonstrate that wireline fibre-optic data can significantly contribute to exploration by providing an efficient and reliable method for deep geothermal reservoir imaging.

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Section: The Groß Schönebeck Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

3D deep geothermal reservoir imaging with wireline distributed acoustic sensing in two boreholes

et al. 2022

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“…The quality of recorded DAS data allows for active seismic imaging in the vicinity of the reservoir. There have been many examples, in- and off-shore, of successful imaging [ 37 , 77 , 78 , 79 , 80 ]. Figure 5 shows imaging results obtained with different DAS configurations compared to an ocean bottom node (OBN) survey.…”

Section: Vertical Seismic Profilingmentioning

confidence: 99%

Seismic Applications of Downhole DAS

Lellouch

Biondi

2021

Sensors

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Distributed Acoustic Sensing (DAS) is gaining vast popularity in the industrial and academic sectors for a variety of studies. Its spatial and temporal resolution is ever helpful, but one of the primary benefits of DAS is the ability to install fibers in boreholes and record seismic signals in depth. With minimal operational disruption, a continuous sampling along the trajectory of the borehole is made possible. Such resolution is highly challenging to obtain with conventional downhole tools. This review article summarizes different seismic uses, passive and active, of downhole DAS. We emphasize current DAS limitations and potential ways to overcome them.

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“…Application of DAS for CO2 monitoring (Götz et al, 2018;Correa et al, 2019) is a well-known routine to provide a reliable method for targeted, detailed imaging and 4D monitoring of the site. 3D DAS VSP surveys in oil and gas exploration reduce exploration risks in regions with a challenging environment, for instance, in the presence of strong production noise (Jiang et al, 2016), in areas with complex salt tectonics (Bartels et al, 2015) etc. In general, all the surveys mentioned above have a better signal-to-noise ratio than data typically recorded with wireline DAS acquisition.…”

Section: The Groß Schönebeck Experimentsmentioning

confidence: 99%

3D deep geothermal reservoir imaging with wireline distributed acoustic sensing in two boreholes

Martuganova

Krawczyk

2021

Preprint

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Abstract. Geothermal exploration will help moving towards a low-carbon economy and provide a basis for green and sustainable growth. The development of new practical, reliable methods for geophysical characterisation of a reservoir has the potential to facilitate a broader application of deep geothermal energy. At the Groß Schönebeck in-situ laboratory, a unique vertical seismic profiling (VSP) dataset was recorded in two 4.3 km deep geothermal boreholes using fibre optic cables in early 2017. The experiment set-up consisted of 61 vibrator points organised in a spiral pattern around the well site to ensure a proper azimuth distribution in the target reservoir section. Data were processed using a standard workflow for VSP. As a result, a detailed 3-dimensional 0.75 × 1 × 4.5 km size image around the existing boreholes was created using the Kirchhoff migration algorithm with restricted aperture. The imaging resolved small-scale features in the reservoir essential for the future exploration of the geothermal research site. Borehole data with vertical resolution up to 16 m revealed the existing depth variations of the Elbe basis sandstone horizon at 4.08–4.10 km depth and indications of an unconformity in the area where we expect volcanic rocks. In addition, in the borehole data a complex interlaying with numerous pinch outs in the Upper Rotliegend reservoir section (3.8 to 4 km depth) was discovered. Thereby, we demonstrate that wireline fibre optic data can significantly contribute to exploration by providing an efficient and reliable method for deep geothermal reservoir imaging.

show abstract

Valhall dual-well 3D DAS VSP field trial and imaging for active wells

Cited by 25 publications

References 6 publications

3D deep geothermal reservoir imaging with wireline distributed acoustic sensing in two boreholes

3D deep geothermal reservoir imaging with wireline distributed acoustic sensing in two boreholes

Seismic Applications of Downhole DAS

3D deep geothermal reservoir imaging with wireline distributed acoustic sensing in two boreholes

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