鱼卡煤田煤层气藏沉积控气作用探讨  

Discussion on Deposition Controlling Role on Coalbed Methane Reservoirs in Yuqia Coalfield

作　　者：严康文[1] 文怀军 郭晋宁 张文龙 刘娜娜[4] 

机构地区：[1]青海大学地质工程系,青海西宁810016 [2]青海煤炭地质局,青海西宁810001 [3]青海煤炭地质105勘探队,青海西宁810007 [4]青海大学化工学院,青海西宁810016

出　　处：《煤炭工程》2015年第10期111-114,共4页Coal Engineering

基　　金：中国地质调查局地质调查项目经费:柴达木盆地北缘富煤区侏罗系煤层气;页岩气资源远景调查(12120114019501)

摘　　要：鱼卡煤田侏罗系煤炭资源量丰富,具有形成煤层气藏的巨大潜能。为了研究沉积作用对鱼卡煤田煤层气藏成藏的控制作用,通过对鱼卡地区侏罗系沉积体系、沉积相以及沉积微相的研究,探讨了不同沉积体系和沉积微相对煤层顶底板封盖性能的控制以及不同沉积体系对煤储层空间展布的影响。研究结果表明:不同沉积体系中,煤储层与顶底板构成不同的组合关系,对煤层气藏封盖性能不同;曲流河三角洲沉积体系中下三角洲平原相带和湖泊沉积体系中滨浅湖相带为最有利成煤环境,利于煤层气藏的成藏;湖湾沼泽微相中形成的封盖层较间湾沼泽微相中更利于煤层气藏保存。The Yuqia coalfield reserves abundant Jurassic coal resources,and great potential for the formation of coalbed methane reservoirs. In order to study the controlling role of sedimentation to the CBM reservoir in Yuqia coalfield,according to the research on the Yuqia Jurassic sedimentary system,sedimentary facies and sedimentary microfacies,this paper discusses the control of different sedimentary systems and sedimentary microfacies on coal roof and floor closure performance and the effects of different depositional systemthe on the spatial distribution of coal reservoirs. The results show that： in different depositional systems,coal reservoirs and roof and floor constituted different combinations relations with different capping performance for the CBM reservoir; the lower delta plain facies in meandering river delta sedimentary system and shallow lacustrine facies in lacustrine depositional system are the most favorable coal- forming environment and beneficial to accumulation of coalbed methane reservoirs; the capping layer formed in bay marsh microfacies is more conducive to preservation of coalbed methane reservoirs than in between bay marsh.

关 键 词：鱼卡煤田 煤层气 沉积体系 沉积相 沉积微相 

分 类 号：TD11[矿业工程—矿山地质测量]