摘要
基于不同沉积环境形成的煤在显微组分、储层物性等方面有很大的差异,为了能够在后续的研究中找出沉积环境对储层物性的影响,在平顶山煤田采集不同煤层的多个样品,利用光学显微镜进行煤岩显微组分鉴定分析,对平顶山煤田南部二叠系煤层的煤相进行了分析研究。结果表明:平顶山煤田南部地区煤层显微组分以镜质组为主,主要矿物为黏土类矿物及黄铁矿。根据不同煤相参数之间的差异性将研究区煤相划分为:较浅水覆水森林沼泽、湿地草本沼泽、弱覆水湿地草本沼泽、潮湿森林沼泽相、低位沼泽五种类型。庚20煤层沉积环境由湿地草本沼泽到低位沼泽再转换为较浅水覆水森林沼泽;己15煤层由底部湿地草本沼泽变为中上部弱覆水湿地草本沼泽。戊8煤层从底部的湿地草本沼泽转变为潮湿森林沼泽,后转变为湿地草本沼泽,最终转化为较浅水覆水森林沼泽。
The coal formed based on different sedimentary environments has great differences in micro-composition and reservoir physical properties.In order to find out the impact of the sedimentary environment on the reservoir physical properties in the subsequent research,different coal seam samples were collected and analyzed by using optical microscope,and the coal facies of Permian coal seam in southern Pingdingshan Coalfield was analyzed and studied.The results show that the microscopic composition of coal seam in the southern area of Pingdingshan Coalfield is dominated by vitrinite group,and the main minerals are clay minerals and pyrite.According to the differences between different coal facies parameters,the coal facies in the study area are divided into five types:shallow-water covered forest swamp,wetland herbaceous marsh,shallow-water covered wetland herbaceous marsh,moist forest marsh facies,and low-level marsh.The depositional environment of Geng20 coal seam changed from wetland herbaceous marsh to low low-lying marsh and then to shallow-water covered forest marsh;Ji15 coal seam changed from bottom wetland herbaceous marsh to middle-upper part shallow-water covered wetland herbaceous marsh.The Wu8 coal seam changed from a wetland herbaceous marsh at the bottom to a moist forest marsh,then to a wetland herbaceous marsh,and finally into a shallow-water covered forest marsh.
作者
翟迎铨
李猛
潘结南
王振至
王相龙
牟朋威
葛涛元
ZHAI Yingquan;LI Meng;PAN Jienan;WANG Zhenzhi;WANG Xianglong;MOU Pengwei;GE Taoyuan(Institute of Resources&Environment,Henan Polytechnic University,Jiaozuo 454003,China;Henan Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region,Jiaozuo 454003,China;Key Lab of Coalbed Methane Resources&Reservoir Formation Process,Ministry of Education,China University of Mining&Technology,Xuzhou 221116,China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2020年第6期191-198,共8页
Coal Science and Technology
基金
国家自然科学基金资助项目(41772162)
河南省高校科技创新团队支持计划资助项目(17IRTSTHN025)。
关键词
沼泽演化
平顶山煤田
煤岩显微组分
煤相
marsh evolution
Pingdingshan Coalfield
coal-rock microstructure
coal facies
