恩洪矿区主要煤层含气特征及主控地质因素
Gas-bearing Characteristics and Main Controlling Geological Factors of Main Coal Seams in Enhong Mining Area
李金龙 1杨顺江 2王宗礼 3陈志柱 1王坚1
作者信息
- 1. 云南省煤田地质局,云南昆明 650000
- 2. 云南省一九八煤田地质勘探队,云南昆明 650217
- 3. 云南省煤炭产品质量检验站,云南曲靖 655000
- 折叠
摘要
立足恩洪矿区地质背景及含煤性,统计分析大量实验测试结果,梳理三个主要煤层含气量的分布特点,研究了气成分组成以及吸附性能.结果表明,该区16煤比9煤吸附煤层气的性能更强,煤层埋深600 m左右吸附气量最大;主要煤层皆为欠饱和煤层,瓦斯分带以沼气带和氮气-沼气带为主,气体中甲烷占比随埋深增大而增高,但受煤层重烃浓度异常高以及气样采取时进入空气影响,煤层埋深800 m甲烷浓度仍低于80%;主要煤层含气量具有向斜控气的特征,从上到下煤层含气量递增.含气量受煤层厚度、埋深以及地下水活动综合影响,沉积作用和地质构造是影响该区煤层含气性的主控地质因素.
Abstract
Based on the geological background and coal-bearing properties of the Enhong mining area,this article analyzes a large number of experimental test results,combs the distribution characteristics of gas content in three main coal seams,and studies the gas composition and adsorption performance.The adsorption performance of coalbed methane in coal seam 16 is stronger than that in coal seam 9,and the maximum gas adsorption capacity is obtained when the coal seam is buried at a depth of about 600 m.The main coal seams are undersaturated coal seams,and the gas zoning is dominated by marsh gas zone and nitrogen-methane zone.The proportion of methane in the gas increases with the increase of burial depth,but due to the abnormally high concentration of heavy hydrocarbons in the coal seam and the influence of air entering during gas sampling,the methane concentration in the coal seam at a depth of 800 m is still lower than 80%.The gas content in the main coal seams has the characteristic of syncline-controlled gas,and the gas content increases from top to bottom.The gas content is affected by the comprehensive influence of coal seam thickness,burial depth,and groundwater activity,and sedimentation and geological structure are the main geological factors affecting the gas content in the coal seam..
关键词
含气特征/主控地质因素/沉积作用/地质构造/恩洪矿区Key words
gas-bearing feature/dominant geological factors/sedimentation/geological structure/Enhong mining area引用本文复制引用
基金项目
云南省矿产资源国情调查项目(M53A00722001061)
出版年
2024
NETL
NSTL
万方数据