2024, issue 5, p. 50-59
Received 06.08.2024; Revised 09.09.2024; Accepted 03.12.2024
Published 18.12.2024; First Online 23.12.2024
https://doi.org/10.34229/2707-451X.24.4.5
Previous | FULL TEXT (in Ukrainian) | Next
Improvement of the "Slowness-Time Coherence" Method of Processing Borehole Acoustic Data Arrays
Sergii Lavreniuk 
, Yevhen Nazarenko , Daria Tulchynska , Petro Tulchynskyi *
V.M. Glushkov Institute of Cybernetics of the NAS of Ukraine, Kyiv
* Correspondence: This email address is being protected from spambots. You need JavaScript enabled to view it.
Introduction. The study of borehole acoustic waves is an important stage in geophysical well research. The main acoustic parameters are P-wave velocity of compression, S-wave velocity of shear, L-wave velocity of Stoneley along the boundary between the rock and the well fluid.
The "Slowness-Time Coherence" (STC) method of estimating the velocity (slowness) is based on the coherence of signal arrays on 2 or more receivers of the well sonic tool. Compared with traditional acoustic logging, the main advantage of STC method is the automation of processing. The main disadvantages of STC method are the high cost and complexity of operating multi-channel sonic tools, and low quality of STC method in layers of high anisotropy, high fracturing, carbonate deposits, in horizontal wells.
These disadvantages caused STC method spread slowly until the last decade. However, at present, the world's leading geophysical service companies (Halliburton, Schlumberger, etc.) use sonic tools with 8-12 receivers and 4 modes of the source signal. Over the past decade, the quality of tools and processing technologies has improved, but the problem of the high cost of using modern tools remains extremely relevant in Ukraine.
The purpose of the article is – to investigate modern methods of data processing of the well sonic tools; to identify the features of the "Slowness-Time Coherence" (STC) algorithm; to propose improvements to the STC method; to implement, to test, and to integrate into production the acoustic data processing technology based on improved STC algorithm.
Results. Improved "Slowness-Time Coherence" (STC) algorithm for calculating the velocity (slowness) of an acoustic wave in geological deposits. In the software package "GeoPoshuk" STC technology has been developed for the processing of acoustic waves. The technology based on the basic and improved STC algorithms. A methodology for comparing the improved STC algorithm with the basic STC algorithm has been developed. Statistical data show the advantage of the improved STC algorithm over the basic one.
Conclusions. The use of the improved STC algorithm provides better automatic data processing compared to the basic STC algorithm.
Keywords: coherence, acoustic waves, sonic tools, geophysical well research, Slowness-Time Coherence" (STC) algorithm.
Cite as: Lavreniuk S., Nazarenko Y., Tulchynska D., Tulchynskyi P. Improvement of the "Slowness-Time Coherence" Method of Processing Borehole Acoustic Data Arrays. Cybernetics and Computer Technologies. 2024. 4. P. 50–59. (in Ukrainian) https://doi.org/10.34229/2707-451X.24.4.5
References
1. Kimball C.V., Marzetta T.L. Semblance processing of borehole acoustic array data. GEOPHYSICS. 1984. Vol. 49, No. 3. P. 274–281. https://doi.org/10.1190/1.1441659 (accessed: 30.07.2024)
2. Xu S., Zou Z. Supervirtual interferometry as a tool for slowness estimation of logging-while-drilling multipole acoustic data. IEEE Transactions on Geoscience and Remote Sensing. 2023. P. 1. https://doi.org/10.1109/tgrs.2023.3274517 (accessed: 30.07.2024)
3. Assous S., Elkington P. Borehole acoustic array processing methods: A review. The Journal of the Acoustical Society of America. 2014. Vol. 136, No. 4. P. 2255. https://doi.org/10.1121/1.4900142 (accessed: 30.07.2024)
4. Advanced monopole and dipole sonic log data processing – part 1: real-time / R. Wang et al. GEOPHYSICS. 2020. P. 1–91. https://doi.org/10.1190/geo2020-0326.1 (accessed: 30.07.2024)
5. Xaminer® Array Sonic Tool (XAST™) Service. https://cdn.brandfolder.io/IO6U2Z0D/at/q1bw10-40y1jc-72dcb4/Xaminer-Array-Sonic-Tool.pdf (accessed: 30.07.2024)
6. Close D., Cho D., Horn F., Edmundson H. The sound of sonic: a historical perspective and introduction to acoustic logging. CSEG Recorder. 2009. 34 (5). P. 34–43. https://csegrecorder.com/assets/pdfs/2009/2009-05-RECORDER-Sound_of_Sonic.pdf (accessed: 30.07.2024).
7. Sonic Scanner. Acoustic scanning platform for downhole acoustic measurements. https://www.slb.com/products-and-services/innovating-in-oil-and-gas/reservoir-characterization/surface-and-downhole-logging/wireline-openhole-logging/sonic-scanner-platform (accessed: 30.07.2024).
8. Beltran F., Yañez-Gonzalez A., Crespo M. J. Indirect determination of shear wave velocity in slow formations using full-wave sonic logging technique. Journal of Rock Mechanics and Geotechnical Engineering. 2020. Vol. 12, No. 6. P. 1226–1233. https://doi.org/10.1016/j.jrmge.2020.05.009 (accessed: 30.07.2024)
9. GOWell’s X-Dipole Logging Tool. https://static1.squarespace.com/static/5c5146db4eddecf7a88e4a5d/t/5f34fa70755b6b6bea5240b5/1597307522951/XDLT.pdf (accessed: 30.07.2024).
10. Haldorsen J., Johnson D.L., Plona T., Sinha B. Borehole acoustic waves. Oilfield Review. 2006. Vol. 18. P. 34–43. https://www.researchgate.net/publication/286735954_Borehole_acoustic_waves (accessed: 30.07.2024)
11. Karpenko V.N., Starodub Yu.P., Karpenko O.V. Model of the dynamic equation of the hodograph (DUG model). Theoretical and applied aspects of geoinformatics. 2009. Iss. 6. P. 320–333. http://jnas.nbuv.gov.ua/article/UJRN-0000176839 (accessed: 30.07.2024)
12. Certificate of copyright registration for the work No. 75839 "Computer program "GeoPoshuk 9" for complex interpretation of geophysical well research data (GeoPoshuk 9)". Authors Kolomiets O.V., Tulchinsky V.G., Tulchynskyi P.G. date of registration 11.01.2018.
13. Tool of industrial geophysics "GeoPoshuk". https://www.geoposhuk.com.ua/ (accessed: 30.07.2024)
ISSN 2707-451X (Online)
ISSN 2707-4501 (Print)
Previous | FULL TEXT (in Ukrainian) | Next