煤岩瓦斯动力灾害主控地质体理论及地质作用机理

1.西安科技大学 能源学院,陕西 西安 710054; 2.重庆大学 资源及环境科学学院,重庆 400044

煤岩瓦斯动力灾害; 发生机理; 主控地质体; 地质作用机理; 层序地层

Main controlling geological body theory and geological effect mechanisms of coal and gas dynamic disaster
DONG Guo-wei1,HU Qian-ting2

(College of Energy Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,China; 2.College of Resources and Environmental Science,Chongqing University,Chongqing 400044,China)

coal and gas dynamic disaster; occurrence mechanism; main controlling geological body; geological effect mechanism; sequence stratigraphy

DOI: 10.13800/j.cnki.xakjdxxb.2017.0102

备注

为研究煤岩瓦斯动力灾害地质作用机理,初次提出了控制煤岩瓦斯动力灾害的“主控地质体”的概念,并进行了定义及分类,采用理论分析、实验室实验、现场实测及现场考察等手段进行了相关研究。研究认为:煤系地层区域沉积体系、地层层序位置决定着煤层厚度、顶底板岩性及粒度、煤层赋存状况等,越靠近海(湖)侵体系域最大海(湖)泛面位置,煤层瓦斯赋存量越大(顶底板石灰岩煤层除外)、煤层煤岩瓦斯动力灾害危险性越大,解释了煤层群中不同煤层煤岩瓦斯动力灾害程度差异; 煤岩瓦斯动力灾害地质作用机理为地层沉积埋藏作用、地质构造作用、热作用、生烃作用等时空配置控制着煤层的改造程度、瓦斯的生成、保存及逸散程度,以及自重应力、构造应力的分布情况,进而控制煤岩瓦斯动力灾害区域分布及灾害程度; 初步建立了主控地质体理论、分析方法及判识依据。研究成果在水城矿区进行了应用,验证了该方法的合理性和适用性。

In order to study coal and gas dynamic disaster geological effect mechanisms,the concept,definition and classification of main controlling geological body for coal and gas dynamic disaster were firstly put forward,and the geological effect mechanisms were studied through theoretical analysis,laboratory experiment and field measurement. The results show that coal and gas dynamic disaster geological effect mechanisms indicate that the coal seam thickness and top and floor lithology and particle size and occurrence status and etc. are controlled by sedimentary system and sequence stratigraphy of coal measure strata,and the closer coal seams to the sea(Lake)flooding surface position of the(lake)transgressive system tract,the more coal seam gas(except for coal seams with limestone roof and floor),and the more dangerous coal seam gas dynanic disasters will be.Coal and gas danger degree differences in the same coal seam group were explained; coal and gas dynamic disaster geological effect mechanisms indicate that coal seam transformation degree,gas generation,storage and dissipation degree,gravity stress and tectonic stress distribution and the regional distribution and disaster degree of coal rock and gas dynanic disaster are controlled by spatial-temporal collocation of strata sedimentary buried and geological tectonism and thermal evolution effect and hydrocarbon generation etc.The theory and analysis methods and decision rules of main controlling geological bodies are preliminarily established.The research results are applied in Shuicheng mining area,and the rationality and applicability are verified.