摘要
陕北侏罗系含水层富水性不均一,实际矿井涌水量与勘探阶段预测值差异较大,为了提高矿井涌水量预测准确性,科学高效指导矿井防治水,采用沉积微相划分、地学信息定性统计与灰色关联定量分析、微观孔隙结构实验室测试等方法分别研究了陕北侏罗系沉积微相、岩性及其组合、微观孔隙结构与富水性的关系,揭示沉积控水机理,总结沉积控水规律,划分沉积控水模式。结果表明:侏罗系砂岩含水层中粗砂岩、中砂岩等粗碎屑岩厚度越大,富水性越强,泥岩与砂质泥岩等细碎屑岩厚度越大,富水性越弱;砂岩地层风化程度相同时,微观孔隙结构分类级别(包括大孔粗喉型(Ⅰ类)、中孔-中-细喉型(Ⅱ类)、小孔细喉型(Ⅲ类)、小-微孔-微细喉型(Ⅳ类))越低,粒度越粗,含水层富水性越强,风化程度不同时,同时代地层风化程度越强,砂岩微观孔隙结构分类级别越低,粒度越粗,含水层富水性越强;侏罗系直罗组含水层主要为河流沉积体系,曲流河、辫状河沉积相,河道、河漫滩沉积微相,相同沉积相条件下河道较河漫滩沉积微相富水性强,河道岩性以砾岩、粗砂岩、中砂岩为主,延安组上部地层以三角洲沉积体系为主,三角洲平原沉积相,分流河道与分流间湾沉积微相,分流河道较分流间湾沉积微相富水性强,分流河道岩性以中砂岩为主,偶见粉砂岩;研究区沉积控水模式划分为辫状沉积强富水性型、曲流河沉积中等富水性型、三角洲平原分流河道沉积弱富水性型、三角洲平原分流间湾沉积极弱富水性型等4种类型。
There is uneven water-enrichment in Jurassic sandstone aquifers in northern Shaanxi Province,and a great difference between actual mine water inflow and the predicted value at exploration stage.In order to improve the prediction accuracy of mine water inflow,scientifically and efficiently guide mine water prevention and control,this paper respectively studied the relationship between sedimentary micro-facies,lithology and its assemblage,microscopic pore structure and water-enrichment using sedimentary micro-facies division,qualitative statistics of geological information and grey correlation quantitative analysis,laboratory test of microscopic pore structure from the angle of sedimentary water control.The mechanism of sedimentary water control was revealed and the law of sedimentary water control was summarized,then,the sedimentary water control mode was put forward.The results show that:①the thicker the coarse clastic rocks such as coarse sandstone and middle sandstone is,the stronger the water-enrichment it is,and the thicker the fine clastic rocks such as mudstone and sandy mudstone is,the weaker the water-enrichment it is.②When the degrees of weathering are the same,the lower the classification level of sandstone microscopic pore structure(The microscopic pore structure include typeⅠfor large pore and coarse throat,typeⅡfor mesopore and middle-fine throat,typeⅢfor keyhole and fine throat,typeⅣfor small-microporous and micro-fine throat)and the coarser the grain size are,the stronger the water-enrichment aquifer is,while the degrees of weathering are different and the stratigraphic age is the same,the lower the classification level of sandstone microscopic pore structure and the coarser the grain size are,the stronger the water-enrichment aquifer is.③The Zhiluo Formation aquifer is dominated by fluvial sedimentary system,and the sedimentary facies are meandering river and braided river,sedimentary microfacies are channel and floodplain.When the sedimentary facies are the same in Zhiluo Formation
作者
冯洁
侯恩科
王苏健
丁湘
段会军
王磊
FENG Jie;HOU Enke;WANG Sujian;DING Xiang;DUAN Huijun;WANG Lei(China Coal Energy Research Institute Co.,Ltd.,Xi’an 710054,China;College of Geology and Environment Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Shaanxi Coal and Chemical Technology Institute Co.,Ltd.,Xi’an 710065,China;Xi’an Research Institute,China Coal Technology & Engineering Group Corp.,Xi’an 710077,China;Innovation Team of “Mining Geology” for Sanqin Scholar,Xi’an 710065,China;China Coal Xi’an Design Engineering Co.,Ltd.,Xi’an 710054,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2021年第5期1614-1629,共16页
Journal of China Coal Society
基金
国家重点基础研究发展计划(973)资助项目(2014CB047103)
国家自然科学基金面上资助项目(41472234)。
关键词
侏罗系
沉积相
岩性组合
微观孔隙结构
控水规律
控水模式
Jurassic system
sedimentary facies
lithology and its combination
microscopic pore structure
sedimentation water control law
sedimentation water control model
