Coalbed low-amplitude tectonic disturbance detection by horizontal directional drilling

Low-amplitude tectonics investigations at Chulmakanskoye coal deposit have been studied from the beginning of the development phase. The first significant findings were obtained as a result of ground-based geophysical work in the central part of the Inaglinskaya mine field. However, the findings showed low reliability in terms of minor fault prediction within the mine field. According to check drilling data only 57% of the predicted faults were confirmed. An innovative technique of the horizontal directional borehole drilling from airway into the seam was proposed to study the minor faults of the D15 coal seam at Inaglinskaya mine field development. The main objective of the study was to spot low-amplitude tectonic dislocations and to study seam occurrence variations along the strike and down-dip within the surveyed section. The main factors in tectonic disturbance spotting were taken as follows: seam roof vertical shifts, drastic variations of seam dip and thickness, technological factors of drilling (fluid loss, drill sticking, etc.). HDD Borehole No.1 was sunk in the Inaglinskaya mine 2PK airway. It intersects the planned drifts of R&P-15−1-40, panels 15−1-2 and 15−1-3. Based on drilling results such D15 morphology disturbances were detected within the studied section of the mine field as folding, low-amplitude and no-amplitude faults, layer-by-layer movements and deformations in the host rocks and coal seams, flexure bends with up to 100 seam dip increase. Splitting and fault wash of the coal seam occur in some areas. Lowamplitude disturbances with amplitudes from 0.1 to 1.6 m are represented by faults, reverse faults and overthrust faults. Plicative disturbances cause local seam thickness increases. As a result of layer-by-layer movements the coal redistributed resulting in D15 swelling and pinching.

Keywords: coalbed low-amplitude tectonic disturbance, horizontal directional drilling, folds, flexures, faults, reverse faults.
For citation:

Grib N. N., Kolodeznikov I. I., Kachaev A. V., Grib G. V. Coalbed low-amplitude tectonic disturbance detection by horizontal directional drilling. MIAB. Mining Inf. Anal. Bull. 2023;(12-1):27—39. [In Russ]. DOI: 10.25018/0236_1493_2023_122_0_27.

Acknowledgements:
Issue number: 12
Year: 2023
Page number: 27-39
ISBN: 0236-1493
UDK: 622.14
DOI: 10.25018/0236_1493_2023_122_0_27
Article receipt date: 05.10.2023
Date of review receipt: 26.10.2023
Date of the editorial board′s decision on the article′s publishing: 10.11.2023
About authors:

Grib N. N., Dr. Sci. (Eng.), Professor, Deputy Director for Research, ORCID: https://orcid. org/0000−0001−9237−0292, NEFU Technical Institute Neryungri Branch, 16 Kravchenko Str., Neryungri, 678960, Russian Federation, e-mail: grib-n-n@yandex.ru, Scopus ID: 55769374800;
Kolodeznikov I. I., Dr. Sci. (Geol. Mineral.), Professor, Advisor to the President of the Academy of Sciences of the Republic of Sakha (Yakutia), 677007, 677007, 33 Lenin Str., Yakutsk, е-mail: i-i-kol@yandex.ru, Scopus ID: 347818;
Kachaev A. V., head of laboratory, NEFU Technical Institute Neryungri Branch, 16 Kravchenko Str., Neryungri, 678960, kachaev67@gmail.com, Scopus ID: 495217;
Grib G. V., Cand. Sci. (Geol. Mineral.), head of laboratory, NEFU Technical Institute Neryungri Branch, 16 Kravchenko Str., Neryungri, 678960, е-mail: grib-n-n@yandex.ru, Scopus ID: 880120.

 

For contacts:

Grib N. N., e-mail: grib-n-n@yandex.ru.

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