现代地质Issue(5)：1087-1095,9.
青海木里三露天天然气水合物钻孔岩心构造裂隙特征
Structural Fracture Characteristics of Cores from Gas-hydrate Drillholes in Sanlutian of Muli Coalfield,Qinghai
摘要
Abstract
Through observation and statistical analysis of gas-hydrate drilling cores in Sanlutian mining area,the characteristics of fractures were discussed from the point of linear density,dip angle and filling degree.The oc-currence type of gas hydrates and the basic feature of structural fractures in the study area were confirmed.The influence of fractures on the formation of gas hydrate was also discussed.The results showed that the gas hydrate mainly occurred in siltstone,dark mudstone and oil shale,and about 62.5% of gas hydrate occurred in struc-tural fractures,which are mainly low-dip angle fractures and unfilled fractures with proportion of 50.37% and 73.68%,respectively;in addition,the density of fractures in the overlying strata reduced to some extent.It is concluded that the development of fractures has important effect on the formation of gas hydrate in the study are-a:firstly,the unfilled fractures have provided migration passages and accumulation spaces for hydrocarbon ga-ses;secondly,the fractures with low-dip angles make the strata have low permeability vertically and formations have poor connectivity,greatly limiting the upward diffusion of hydrocarbon gases;finally,the reduction of frac-tures in the overlying strata also inhibits the upward diffusion of hydrocarbon gases,playing the role of cap rocks.关键词
三露天井田/天然气水合物/裂隙Key words
Sanlutian mining field/natural gas hydrate/fracture分类
天文与地球科学引用本文复制引用
陈利敏,秦荣芳,蒋艾林,王林杰,曹代勇,李永红,王伟超..青海木里三露天天然气水合物钻孔岩心构造裂隙特征[J].现代地质,2015,(5):1087-1095,9.基金项目
高等学校博士学科点专项科研基金项目（20110023110003）；中央高校基本科研业务费专项资金项目（2010YD11）；神华青海能源开发有限责任公司项目“青海省天峻县聚乎更煤矿区三露天天然气水合物调查评价”（SHQHNY201307001）。 （）
