南华北二叠系含煤地层沉积环境与煤层弹性参数的关系  

Relationship Between Sedimentary Environment of Coal-bearing Strata in Permian and Elastic Parameters of the Coal in Southern North China

作　　者：陈飞 张冀 徐娟 侯海海 Chen Fei;Zhang Ji;Xu Juan;Hou Haihai(College of mining engineering and geology,Xinjiang Institute of Engineering,Urumqi,Xinjiang,830023,China;Geological Society of,Urumqi,Xinjiang,830000,China;College of mining,Liaoning Technical University,Fuxin,Liaoning,123000,China)

机构地区：[1]新疆工程学院矿业工程与地质学院,新疆乌鲁木齐830023 [2]新疆维吾尔自治区地质学会,新疆乌鲁木齐830000 [3]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《新疆地质》2024年第3期392-396,共5页Xinjiang Geology

摘　　要：为揭示不同成煤环境下煤层弹性参数变化,以南华北盆地二叠系海陆过渡相成煤环境为研究区域,对采自不同古地理单元的煤样在常温常压下进行三维超声测试实验,同时以含煤岩系砂泥比值作为确定古地理单元的主要依据,对研究区内含煤地层沉积环境与煤层弹性参数的关系进行研究。结果表明:各煤样纵波速度均大于横波速度,走向上纵横波速>倾向>垂向,3个方向纵横波速随砂泥比值的增大呈先降后升的趋势;各煤样走向上的杨氏模量>体积模量>剪切模量,三者随砂泥比值的增大呈先降后升的趋势,而泊松比随砂泥比值的增大则先升后降;随海岸线由北向南不断前移,沉积环境由三角洲分流平原到三角洲前缘,纵横波速、杨氏模量、体积模量和剪切模量呈现先减小后增大的趋势,而泊松比正好相反,呈先增大后减小的趋势,预测相应的煤层气含气量先增大后减小,煤层裂隙密度先增高后降低。In order to study change of elastic parameters in coal-bearing strata under different sedimentary environment,ultrasonic experiment of five coal samples and the relationship between sedimentary environment and elastic parameters were studied,which took from different paleogeography unit in Southern North China.The results show that Pwave velocities in all samples exceed their S-wave(strike>dip>vertical),and the velocities,Young's modulus,bulk modulus and shear modulus decreased firstly and increased then with the increasing of sand-mud ratio,but the variation trend of Poisson's ratio is just opposite.For sedimentary environment of each coal sample,the change of each parameter is the same with the above from delta distributary channel to the delta front,meanwhile coal-bed methane and fracture density increased firstly and then decreased.

关 键 词：南华北盆地 二叠系 沉积环境 弹性参数 超生实验 煤层气 

分 类 号：P588.2[天文地球—岩石学] P512.2[天文地球—地质学] P534.46