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Sains Malaysiana 46(11)(2017): 2125-2132 http://dx.doi.org/10.17576/jsm-2017-4611-13 Connectivity Analysis of Magnetic Mineral Veins
based on Multi-boreholes Image ZENGQIANG HAN1*, CHUANYING WANG1 & PEILIANG
HU2 1State Key Laboratory of Geomechanics
and Geotechnical Engineering, Institute of Rock and Soil Mechanics,
Chinese Academy of Sciences, Wuhan 430071, China 2Changsha Institute of Mining Research,
Changsha 410012, China Received:
8 February 2017/Accepted: 1 June 2017 ABSTRACT There are a large number of primary
structural planes of deep rock ore such as rhyolite, and bedding,
which are well preserved and are often the geological interfaces
of mineralization. Study on the occurrence of these structural
planes is helpful to understand the extension direction of deep
veins. Using borehole imaging technology as the means of acquiring
information of structural plane, the magnetic angle of the borehole
is obtained by using the gyroscope and the magnetic instrument
and the structural plane occurrence is modified to obtain the
accurate information. According to the depth effect of the deep
structural plane, the concept of the feature point pair is proposed.
In this paper, the mathematical description method of the structural
plane in the space coordinate system is established and the
information of the shape and depth of the structure plane is
transformed into the 3D point coordinates in the space coordinate
system. Based on the feature points, the connectivity analysis
method of structural plane is established and the connectivity
of the structural planes such as the interface of the vein and
rhyolite is analyzed. According to the stratigraphic information
in the borehole image, the extension direction of the whole
field is determined. The feasibility of the method is verified
by the application in a magnetite in Anhui Province, China.
The results are in good agreement with the actual drilling results
and the error of traditional drilling analysis is corrected.
The main conclusions of this paper include: The use of gyroscopes
and magnetic instrument can obtain the magnetic effect angle,
to modify the structural plane information; and multi borehole
structural planes connectivity analysis can provide a reference
for the extension of the deep veins. Keywords: Borehole image; connectivity analysis; magnetic effect
angle; magnetic mineral vein; structural plane ABSTRAK Terdapat sejumlah besar
struktur satah utama dalam bijih batuan dalam seperti riolit
dan perlapisan yang terpelihara dan merupakan antara muka geologi
untuk pemineralan. Kajian tentang kejadian struktur satah ini
sangat membantu untuk memahami arah perluasan vena dalam. Menggunakan
teknologi pengimejan lubang gerek sebagai cara mendapatkan maklumat
struktur satah, sudut magnet lubang gerek diperoleh dengan menggunakan
giroskop dan alatan magnet dan kejadian struktur satah diubah
suai untuk mendapatkan maklumat yang tepat. Menurut kesan kedalaman
struktur satah dalam, konsep ciri butiran pasangan dicadangkan.
Dalam kertas ini, kaedah penerangan matematik struktur satah
dalam sistem koordinat ruang ditubuhkan dan maklumat bentuk
dan kedalaman struktur satah ditukar menjadi koordinat butiran
3D dalam sistem koordinat ruang. Berdasarkan ciri butiran ini,
kaedah analisis kesambungan struktur satah ditubuhkan dan kesambungan
struktur satah seperti antara muka vena dan riolit dianalisis.
Menurut maklumat stratigrafi dalam imej lubang gerek, arah perluasan
keseluruhan bidang ditentukan. Kebolehlaksanaan kaedah ini disahkan
dengan kegunaannya dalam magnetit di Wilayah Anhui, China. Keputusan
ini bersetuju dengan keputusan sebenar penggerudian dan ralat
analisis penggerudian tradisi diperbetulkan. Kesimpulan utama
kertas ialah penggunaan giroskop dan alatan magnet boleh mendapatkan
sudut kesan magnet untuk mengubah suai maklumat struktur satah
dan analisis kesambungan pelbagai lubang gerek struktur satah
boleh memberikan rujukan untuk perluasan vena dalam. Kata kunci: Analisis kesambungan; imej
lubang gerek; struktur satah; sudut kesan magnet; vena mineral
magnet
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