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  Moving Source profiling - A Link between KTB-Borehole Data and Seismic Surface Measurements

Harjes, H.-P., Janik, M., Kemper, M. (1990): Moving Source profiling - A Link between KTB-Borehole Data and Seismic Surface Measurements. - In: Emmermann, R., Lauterjung, J., Umsonst, T. (Eds.), KTB Report 90-6b: Integrated Seismics Oberpfalz 1989; Longterm Logging and Testing Programme of the KTB-Oberpfalz VB, Potsdam : Deutsches GeoForschungsZentrum GFZ, 137-155.
https://doi.org/10.48440/ktb.90-6b_6

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5011695 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5011695_3
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https://doi.org/10.2312/ktb.90-6b (Supplementary material)
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Is published in: Dürbaum, H.-J., Reichert, C., Bram, K. (Eds.)(1990): KTB Report 90-6b: Integrated Seismics Oberpfalz 1989; Longterm Logging and Testing Programme of the KTB-Oberpfalz VB, (KTB Reports; 90-6b)(DEKORP Report). https://doi.org/10.2312/ktb.90-6b

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 Creators:
Harjes, H.-P.1, Author
Janik, M.1, Author
Kemper, M.1, Author
Affiliations:
1KTB Reports, External Organizations, ou_853888              

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 Abstract: The moving source profiling (MSP) measurements are done by moving seismic sources along a surface line crossing the well site while a chain of geophones, placed within the well bore at a certain depth, records the seismic response. A multifold coverage of the subsurface can be obtained by repeating the source profile for a number of different geophone depths. This idea of altering the conventional vertical seismic profiling (VSP) geometry to allow illumination of subsurface structure away from the well is an attractive idea because it is designed to better locate horizons below the drill bit. If these target horizons can be correlated with reflectors in usual seismic profiles, recorded on the surface, the latter can be calibrated by the MSP results. Two MSP experiments were realized in the KTB pilot borehole. The first (MSP 1) included two N-S and E-W orientated source profiles of 10 km length and a single threecomponent geophone at 3585 m depth. Later a full MSP experiment (MSP 2) was run for one NE-SW orientated source profile and 20 different geophone depths. The source line was extended 7 km to the Northeast and 3 km to the Southwest of the well. A vibrator source produced seismic signals every 50 m. These shots were recorded by three-component geophones at depths from 3210 m to 3685 m with 25 m intervals resulting in a 20-fold coverage of the illuminated subsurface. Due to the difficulties encountered in crystalline environments, different processing techniques were combined for interpretation of the MSP data set. Aside from comparing measured first-break times with theoretical ones to determine seismic velocities of the overburden an MSP-CDP transformation for migration were applied. The steeply dipping boundary of the Falkenberg granitic intrusion was mapped as a distinct velocity contrast east of the KTB well. On the other hand, some remarkable seismic reflectors at depths between 4000 m and 10000 m are predicted to be hit by the future KTB main borehole.

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Language(s): eng - English
 Dates: 19901990
 Publication Status: Finally published
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.48440/ktb.90-6b_6
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Title: KTB Report 90-6b: Integrated Seismics Oberpfalz 1989; Longterm Logging and Testing Programme of the KTB-Oberpfalz VB
Source Genre: Proceedings
 Creator(s):
Emmermann, R.1, Editor
Lauterjung , J.1, Editor
Giese, P., Author
Umsonst, T.1, Editor
Affiliations:
1 KTB Reports, External Organizations, ou_853888            
Publ. Info: Potsdam : Deutsches GeoForschungsZentrum GFZ
Pages: 19 Volume / Issue: 90-6b Sequence Number: - Start / End Page: 137 - 155 Identifier: DOI: 10.2312/ktb.90-6b