| 右江盆地流体运移过程中成矿与成藏作用 |
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| 关键词:basin fluid fluid reservoir conduit system differential concentration Youjiang basin |
| 基金项目:国家攀登计划预选项目(95预39)，国土资源部重点科研项目(9501103) |
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| 摘要: |
| Ore-forming Process and Petroleum Accumulation during Fluid Migration in the Youjiang Basin, South China |
| The sediments deposited in the rifting and the early depression stages provided materials and fluids for ancient oil reservoirs and ore deposits. The ore forming elements and the organic matter were transported to the basin margin or the core of the Permian reef by the same basin fluid along the conduit systems consisting of faults, turbidite sandstones and unconformities. Due to the density difference, the hydrocarbon and the ore bearing fluids were trapped in different reservoirs (hydrocarbon reservoirs or ore bearing solution reservoirs) along the conduit systems. The destruction of these reservoirs changed the characteristics of the fluids to an extreme extent and caused the precipitation of the ore forming elements. Tectonic movement, erosion and fluid hydrofracturing were three factors responsible for the destruction of the fluid reservoir, with the first factor being most important. Thus, the gold deposits in the Youjiang basin were formed mainly during the Yanshanian tectonic movement. Viewed from the fluid migration and evolution, the ancient oil reservoirs were formed during the rifting and depression stages of the basin, while ore deposits resulted from the destruction of the fluid reservoirs during the uplifting stage of the basin. This analysis verifies the conclusion that the ore deposits and ancient hydrocarbon reservoirs in this area are products of the same basin fluid in its different stages of evolution. The conclusion reached is of great significance in guiding the exploration of the same kind of ore deposits in the sedimentary basin. |
| XIANG Cai-fu,HU Jian-wu.2003.Ore-forming Process and Petroleum Accumulation during Fluid Migration in the Youjiang Basin, South China[J].Acta Geoscientica Sinica,24(5):423-428. |
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