古地理学报Issue(4)：427-440,14.DOI:10.7605/gdlxb.2014.04.036
中上扬子地区晚奥陶世岩相古地理及其油气地质意义
Lithofacies palaeogeography of the Late Ordovician and its petroleum geological significance in Middle-Upper Yangtze Region
摘要
Abstract
Miaopo, Baota, Linxiang (Jiancaogou ), Wufeng and Guanyinqiao Formations were formed during the Late Ordovician in the Middle-Upper Yangtze Region.Based on outcrops and cores ob-servations,combining with the previous research,the lithology,palaeontology,ecology and laboratory a-nalysis were used to divide the facies into tidal flat,shallow marine shelf,and deep water basin facies in study area.Among them,tidal flat facies was characterized by the deposits of limestones,dolomites,cal-careous siltstones and siltstones.Shallow marine shelf facies was mainly composed of “chapping grain”limestones,nodular limestones,shales and silty shales.While black carbonaceous shales,silty shales, and siliceous shales were deposited in the deep water basin,which predominantly produced graptolite as-semblages living by floating camp.The lithofacies palaeogeographic analysis shows that there was a strong inter-plate collision and extrusion in the South China Plate,which was influenced by the Caledonian Tec-tonic Movement in the Late Sandbian-Early Katian Age of the Late Ordovician.During that period,the Central Sichuan and Western Sichuan-Central Yunnan-Central Guizhou-Xuefeng Uplifts gradually swelled up and expanded,meanwhile the relative sea level rose and the rimmed carbonate platform was submerged and deposited a wide range of shallow marine shelf facies“chapping grain”and nodular limestones.In the late Katian and Hirnantian Age of the Late Ordovician,those uplifts continued to expand,and the Middle-Upper Yangtze region mostly began to deposit black carbonaceous shales,silty shales and siliceous shales in the limits of uplifts movements.Especially for the Yibin-Luzhou area in southeastern Sichuan,Wang-cang-Nanjiang area in northern Sichuan and the Wulong-Daozhen area in eastern Chongqing and northern Guizhou,the black siliceous and carbonaceous shales show good hydrocarbon potential,and could be the key study areas for the further exploration and development for source rocks and shale gas.关键词
中上扬子地区/晚奥陶世/岩相古地理/油气地质Key words
Middle-Upper Yangtze Region/Late Ordovician/lithofacies palaeogeography/petro-leum geology分类
天文与地球科学引用本文复制引用
牟传龙,葛祥英,许效松,周恳恳,梁薇,王秀平..中上扬子地区晚奥陶世岩相古地理及其油气地质意义[J].古地理学报,2014,(4):427-440,14.基金项目
国家科技重大专项“全国油气基础地质研究与编图”（编号2011 ZX05043-005）和中国地质调查局项目“中国岩相古地理编图”（编号1212011120112）联合资助 （）
