摘要
古叙煤矿区石宝矿段龙潭煤系地层主要为龙潭组处于扬子地台东南边缘海陆交界地带,厚度76.25~105.62 m,含煤11~24层,煤层总厚度8.44~27.15 m,可采煤层8层。根据岩性、岩相等,可将煤层从上到下可分为3段,上段为较闭塞海湾沉积环境,因海进海退及灾害频繁,产煤量少,仅C 13、C 14、C 15可采;中段为较闭塞海湾—潮坪沉积环境,因构造活动趋于平稳,成煤厚度较大,C 17、C 20、C 23、C 24煤层接近,基本全区可采;下段为障壁岛—泻湖沉积环境,因地裂运动,可采区仅C 25层。三段厚度差异较大,反映了二叠纪晚期地裂运动对该地区影响较大,沉积环境差异是本区成煤条件的主要控制因素。
The Longtan coal measures strata in Shibao section of the Guxu coal mining area are mainly located at the junction of sea and land in the southeast margin of the Yangtze platform,with thickness of 76.25105.62 m,containing 1124 coal seams,total thickness of coal seam 8.4427.15 m,and 8 recoverable coal seams.According to the lithology and rock equivalence,the coal seam can be divided into three sections from top to bottom.The upper section is a relatively occluded bay sedimentary environment,with less coal production due to frequent transgression,regression,and disasters,only C 13,C 14 and C 15 can be mined;The middle section is a relatively occluded bay-tidal flat sedimentary environment.Due to the tectonic activity tends to be smooth,the thickness of coal formation is larger,and the C 17,C 20,C 23 and C 24 coal seams are close,basically the whole area can be mined;The lower section is a barrier island-lagoon sedimentary environment,and due to the ground rift movement,only the C 25 layer can be mined.The large difference in thickness among the three sections reflects the large influence of Late Permian ground fissure movement on the area,and the difference in sedimentary environment is the main controlling factor for the coal-forming conditions in this area.
作者
师晓文
杨帆
宋靓靓
李健雄
SHI Xiaowen;YANG Fan;SONG Liangliang;LI Jianxiong(The Sixth Geological Brigade of Sichuan Province,Luzhou 646000,Sichuan,China)
出处
《吉林地质》
2023年第3期47-50,58,共5页
Jilin Geology
关键词
龙潭组
沉积环境
成煤条件
古叙矿区
Longtan Formation
deposition environment
coal-forming conditions
Guxu mining area
