摘要
基于大量钻井资料分析及数据统计,运用地层学、沉积学和岩相古地理学等理论和研究方法,在老挝桑怒地区新近纪中新世含煤盆地内识别出13种岩石类型、5种沉积相和2种沉积体系。依据单因素分析多因素综合作图法,定量恢复了该地区中新世的岩相古地理格局。当时沉积古地理特征表现为:陡坡带位于盆地西南缘,发育冲积扇—扇三角洲—湖泊沼泽沉积体系;缓坡带位于盆地东北缘,发育辫状河三角洲—湖泊沼泽沉积体系;物源剥蚀区位于盆地西南缘及东北部三叠纪古陆;水流方向由西南部及东北部汇入盆地中心;沉积最大厚度区位于盆地中心区域。
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 deltalacustrine system was developed; the gentle slope belt was located in northeastern part of the basin where thebraided 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.
作者
陈磊
齐永安
杨文涛
王海泉
Chen Lei Qi Yong＇an Yang Wentao Wang Haiquan(lnstitue of Resources and Environment, Henan Polytechnic University, Jiaozuo 454003, Henan Henan Province General Research Institute of Coal Geology Exploration, Zhengzhou 450052, Henan)
出处
《古地理学报》
CAS
CSCD
北大核心
2016年第5期819-832,共14页
Journal of Palaeogeography：Chinese Edition
基金
2015年度河南省国土资源科技项目(编号:2015-49)
河南省煤炭地质勘察研究总院委托项目联合资助~~
关键词
岩相古地理
沉积相
中新世
老挝桑怒
lithofacies palaeogeography
sedimentary facies
Miocene
Xam Nua area in Laos
