摘要
煤层气成藏条件和富集规律研究是勘探开发的基础,针对准噶尔盆地南缘煤层气勘探开发现状,从"生气、储集、保存"3个方面进行了分析研究。煤储层的生气能力对煤层气能否富集影响较小,研究区西山窑组煤储层空气干燥基Langmuir体积平均22.2m^3/t,八道湾组空气干燥基Langmuir体积平均25.87m^3/t,煤储层的储集性能较好。煤层自身封闭作用、煤层顶底板的封闭作用、煤层埋深及上覆岩层压力有利于煤层气的保存,构造运动和水文地质条件对煤层气保存的影响不一。在此基础上总结出四种煤层气富集规律和构造控气和水动力构造控气两种控气模式,其中逆冲推覆构造是控制本区煤层气富集的重要因素,构造控气是主要的控气模式。
CBM reservoiring condition and enrichment pattern study is the basis of exploration and exploitation.In allusion to the CBM exploration and exploitation status quo in the southern Junggar Basin have carried out analytic studies from three aspects of CBM generation,accumulation and preservation.Coal reservoir gas generation capacity has less impact on if CBM can be enriched.The Xishanyao Formation coal reservoir air-dried basis average Langmuir volume is 22.2m^3/t,and that of the Badaowan Formation is 25.87m^3/t,so the later has better coal reservoir accumulation capability.Sealing effects of coal itself,coal roof and floor,coal buried depth and overburden strata pressure are beneficial to CBM preservation,while the tectonic movement and hydrogeological condition have different impacts.On these bases have summarized four CBM enrichment patterns and two CBM control modes,in which,the thrusting nappe structure is the major factor to control CBM enrichment and structural CBM control is the main CBM control mode.
作者
贾秉义
Jia Bingyi(Xi’an Research Institute,China Coal Technology and Engineering Group Corp,Xi’an,Shaanxi 710054)
出处
《中国煤炭地质》
2018年第11期40-43,共4页
Coal Geology of China
基金
国家科技重大专项课题(2016ZX05045-002-001
2016ZX05045-002-002)
