现代地质Issue(5)：1073-1086,14.
青海聚乎更矿区三露天井田中侏罗统沉积环境
Depositional Environments of the Middle Jurassic in the Sanlutian Mining Field of the Juhugeng Mining Area in Qinghai Province
摘要
Abstract
The Juhugeng mining area in Qinghai Province is the primary discovery site of the gas hydrates in the mid-latitude of the global land,with the gas hydrates being preserved in the Middle Jurassic coal-bearing series of the Sanlutian mining field.This paper analyzed the depositional environments of the coal-bearing series in the Sanlutian mining field by using the borehole cores and logging curves.The palaeogeographic outlines of each lithological member of the Middle Jurassic have been reconstructed based on the single borehole facies analysis and the cross-section facies correlations.The lithology of the Lower Member of the Muli Formation is mainly fine conglomerates,pebbly sandstone and coarse-grained sandstone,reflecting a braided river-dominated environ-ment.The Upper Member of the Muli Formation is characterized by the thick sandstone interbedded with thick coal seam,indicating a gradual deepening process and development of the deltaic environment.The Lower Member of the Jiangcang Formation is characterized by the fine-grained sandstones interbedded with mudstones and thin coal seams,signifying a further deepening process and development of the delta front and shore-shallow lake environments.The Upper Member of the Jiangcang Formation consists mainly of oil shale and dark mud-stone containing bivalve fossils,reflecting a shallow to deep lake environment.关键词
中侏罗世/沉积环境/天然气水合物/聚乎更矿区/三露天井田Key words
Middle Jurassic/depositional environment/gas hydrate/Juhugeng mining area/Sanlutian min-ing field分类
天文与地球科学引用本文复制引用
杨致宇,王伟超,邵龙义,刘文进,吕景高,李永红,怀军..青海聚乎更矿区三露天井田中侏罗统沉积环境[J].现代地质,2015,(5):1073-1086,14.基金项目
神华青海能源开发有限责任公司“青海省天峻县聚乎更煤矿区三露天天然气水合物调查评价”项目（SHQHNY 201307001）；中国地质调查局油气资源调查中心“我国非常规能源矿产调查评价选区研究”子课题（1212011220794）。 （）
