Method of sedimentary basin reconstruction and compilation of lithofacies - paleogeographic maps

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Method of sedimentary basin reconstruction and compilation of lithofacies - paleogeographic maps

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Title: Method of sedimentary basin reconstruction and compilation of lithofacies - paleogeographic maps
Author: Tran, Nghi
Abstract: A secondary basin corresponds with a second order depositional cycle, is limited by two erosional surfaces which are also the boundaries of a seismic sequence. In other words, a secondary basin is a component of an overall sedimentary basin. A secondary basin is formed at the same time with a tectonic phase where the three most important factors are faulting, subsidence and uplifting. Basin-forming faults are usually normal faults and are called "syn-depositional fault". The reconstruction of a sedimentary basin, is rather complicated, but it is very necessary for basin analysis, facial analysis and compilation of lithofacies-paleogeographic maps, as the dimensions and thickness of the present secondary basin are not the same as of the primitive basin. To get a true picture of the primitive basin one must carry out the following steps: - Drawing the recontructed geologic sections - Reconstructing the sediment thickness - $$h_1 = h_2\roof t 3 {K.\frac {P_1}{P_2}}$$ where $h_1$ is the primitive thickness $h_2$ is the present thickness K is the shrinkage coefficient (depending on the rock type) - - $P_1$ is the primitive common porosity - $P_2$ is the present common porosity - Reconstructing the integrated geologic-sedimentary sections: - + Width of the basin $$L_1=C.[L_2-\sum_{t=1}^n L_{1i}+\sum_{t=1}^mL_{2i}+\sum_{t=1}^fL_{3i}]$$ where $C$ is a correction coefficient: $C=l.25$ (digenetic stage), 1.55 (catagenetic stage) and 1.9 (metagenetic stage). + Thickness of the basin: $H_1 = ch_2$ - Reconstructing the boundaries of the basin - Reconstructing the isopach map - Compiling the lithofacies-paleogeographic map.
URI: http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/9206
Date: 2009

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