Sedimentary facies and palaeogeographic characteristics of the Miocene coal-bearing basin in Xam Nua area, Laos
Chen Lei1, Qi Yong’an1, Yang Wentao1, Wang Haiquan2
1 Institue of Resources and Environment,Henan Polytechnic University,Jiaozuo 454003,Henan; 2 Henan Province General Research Institute of Coal Geology Exploration,Zhengzhou 450052,Henan
Abstract：Based on data analysis and statistics of a large number of wells,utilizing theories and methods of stratigraphy,sedimentology and lithofacies palaeogeography,thirteen rock types,five sendimentary facies and two depositional systems were recognized in the Neogene Miocene coal-bearing basin in Xam Nua area,Laos. The lithofacies palaeogeographic map was drawn by the single factor analysis and multifactor comprehensive mapping method. The lithofacies palaeogeographic features can be summarized as follows: the steep slope belt was located in southwestern margin of the basin, where the alluvial fan-fan delta-lacustrine system was developed; the gentle slope belt was located in northeastern part of the basin where the braided river delta-lacustrine system was developed; the provenance areas were located in western margin of the basin and the Triassic old land in the northeast of the basin; the water flowed from the southwest and the northeast to the central basin; the largest sedimentary thickness occurred at the central basin.
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