Citation: | Chen Weiwei, Yang Fengli, Zhuang Yuan, Xu Mingchen, Hu Yuyang. On the reliability of drilling core reorientations using palaeomagnetic methods: A case study from the boreholes in the Tarim Basin[J]. Bulletin of Geological Science and Technology, 2023, 42(6): 266-280. doi: 10.19509/j.cnki.dzkq.tb20220255 |
This study explores the accuracy of drilling core reorientations by using remanent magnetization.
To this end, paleomagnetic analyses were carried out on 43 Silurian sandstone samples collected from five boreholes (TKQ101, SHUN9, TAT19, TZ18, and TS108)in the Tarim Basin. Meanwhile, rock magnetic measurements, scanning electron microscope (SEM) and energy dispersive spectral (EDS) observations were conducted on representative samples to identify the predominant magnetic carriers. Furthermore, the paleocurrent direction inferred from the corrected maximum magnetic susceptibility (Kmax)axis of the anisotropy of magnetic susceptibility (AMS) using remanent magnetization was analyzed.
AMS results indicate a sedimentary fabric preserved in the studied drilling cores, suggesting their stratigraphy are overall horizontal.Rock magnetic results, SEM and EDS observations reveal that magnetite is the dominant magnetic carrier for the TKQ101 samples, with small amounts of goethite and hematite, while pyrrhotite and magnetite are the dominant magnetic carriers for the other samples. The demagnetization results indicate that the viscous remanent magnetization (VRM) acquired in the present geomagnetic field and the characteristic remanent magnetization(ChRM) of the Silurian formation can be isolated for the TKQ101 samples, where the original azimuth rotations (
In summary, to restore the original orientations of these drilling cores, the following rotation angles are required: 258.0°-262.0° counterclockwise rotation for the TKQ101 drill cores; 148.1°, 221.2°, and 318.2° counterclockwise rotation for the 4th, 5th and 6th sections from the borehole SHUN9, respectively; 269.8° and 155.9° counterclockwise rotation for the sections 3 and 5 from the borehole TAT19, respectively; 239.3° and 256.6° counterclockwise rotation for drill cores from the boreholes TS108 and TZ18, respectively.
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