三维地震及电法综合勘探在内蒙古东部煤田的应用

Application of Integrated 3D Seismic and Electric Prospecting in an Eastern Inner Mongolia Coalfield

本次探区位于内蒙东部,现开采层段为Ⅱ2a煤层,该矿在初探阶段用比拟法予计矿井涌水量,对各含水层及其相互间水力联系缺乏认识,致使建井采煤期间多次发生突水溃砂现象。为查明开采层段煤层顶板含水层分布规律、埋藏条件及水力联系,并查明勘探区内构造情况,对该区进行三维地震及电法综合勘探。使用三维地震方法查明了测区内Ⅱ2a煤层底板及几个主要含水层底界面的起伏形态和深度,解释断层14条,其中煤层发育有1条断层、6号含水层发育10条小断层,4号含水层发育有3条小断层;利用电法基本控制了区内含水层富水性和分布情况,查明了含水层的分布形态和埋深。

The exploration area is located in eastern Inner Mongolia,the II2 coal seam is mining in this stage.The mine's expected inflow growth was assimilated with neighboring mines at the preliminary exploration stage,resulted in lack understanding of hydraulic connection between aquifers,thus brought about water and sand bursting many times during mine constructing and mining.In order to find out mining sector roof aquifer distribution pattern,burial condition,hydraulic connection and structures in the area,integrated 3D seismic and electric prospecting carried out.By the use of 3D seismic prospecting,floor undulation pattern,depth of II2 coal seam and some main aquifers in the area were identified,14 faults were found including 1 in coal seam,10 minor faults in No.6 aquifer,3 minor faults in No.4 aquifer.While by electric prospecting,aquifer water yield properties and distribution were basically controlled,distribution pattern and burial depth identified.