科研之友
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摘要
The Khorat Basin is an important potash basin in the Tethys metallogenic belt, but the exploration and development of potash deposits in this area are severely restricted due to the unclear deformation structure and the distribution rules of potash salts. Based on the analysis of macro-regional tectonic evolution, taking a small region in the Vientiane Sag as an example, under the strict constraints of high-precision 3D seismic exploration and drilling natural gamma logging, the underground accurate structural changes and potash ore distribution data were obtained. Combined with the deformation characteristics of salt structure and seismic exploration profile, the geological interpretation was carried out. The results indicate that the squeeze, slip, and rotation of the Indosinian block have strongly transformed the potash deposits in the Khorat Basin. Three types of potash deposit transformation models are summarized, including evaporite Jura type fold deformation model, differential load enrichment modes under stress, enrichment mode rotating around hard salt mound.
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