和什托洛盖盆地石炭系太勒古拉组泥页岩岩矿特征  

The Lithological Feature of Carbonaceous Tailugula Formation Mud Shale in Hoxtolgay Basin

作　　者：史美超[1] 白洪海[1] 郑曦 冷平武 Shi Meichao;Bai Honghai;Zheng Xi;Leng Pingwu(No.9 Geolgical Party,BGMRED of Xinjiang,Urumuqi,Xinjiang,830000,China)

机构地区：[1]新疆维吾尔自治区地质矿产勘查开发局第九地质大队,新疆乌鲁木齐830000

出　　处：《新疆地质》2017年第3期245-249,共5页Xinjiang Geology

摘　　要：和什托洛盖盆地上石炭统太勒古拉组具有页岩气勘探潜力。为详细了解太勒古拉组泥页岩岩矿特征及其对页岩气勘探开发的影响,采用X射线衍射仪定量分析法,对其中的泥页岩岩矿特征进行了较全面的系统分析,结果表明太勒古拉组泥页岩具以下特征:(1)脆性矿物百分含量均值超过50%,表明可压裂性较好;(2)黏土矿物以伊利石和绿泥石为主,且随着伊利石含量的增多,伊/蒙间层含量大致呈相应降低的规律;(3)太三段泥页岩黏土矿物组合为高岭石+伊蒙混层+绿泥石+伊利石,加之其有机质镜质体反射率深部平均为1.15%,地表平均为1.20%,表明太三段已进入中成岩阶段;(4)黏土矿物、石英+长石及碳酸盐岩含量与井深相关性较差;盆地西南缘及东南缘脆性矿物含量略高于南缘,盆地北缘脆性矿物含量略低于盆地南缘,黏土矿物反之;(5)该组沉积于滨海环境,与川南筇竹寺组和龙马溪组海相泥页岩的形成环境不同。The Carboniferous Tailugula Formation has shale gas exploration potential in Hoxtolgay basin.In order to understand detailed and evaluate the geologic characteristics of the shale gas in the Tailugula Formation,which using X ray diffraction quantitative analysis the characteristics of the carbonaceous mud shale.The results show that:(1)The percentage of brittle minerals in the Tailugula Formation is more than 50%,which means that the fracturing property is better;(2)Clay minerals content is given priority to with illite and chlorite,and along with the increase in content of illite,the ratio of Iraq/layer between content roughly presents the corresponding lower law;(3)The 3rd member of Tailugula shale clay minerals include kaolinite+illitemixedlayer+chlorite+illite,and the vitrinite reflectance depth averaged 1.15%,surface averaged 1.20%,shows that mud shale of the 3rd member of Tailugula has entered the middle diagenetic stage;(4)There was no significant correlation among the content of clay minerals,quartz+feldspar and carbonate rocks and the depth change of the carbonate rocks.The brittle minerals content of the southwest and the southeast margin of the basin which is slightly higher than that of the south rim.The brittle minerals content of the north margin of the basin is slightly lower than the south margin;and Clay minerals vice versa.(5)The mud shale formed in the littoral environment,that are different from the Qiongzhusi Group of south Sichuan and Longmaxi Group Marine mud shale formation environments.

关 键 词：和什托洛盖盆地 石炭系 太勒古拉组 泥页岩 岩矿特征 

分 类 号：P618.13[天文地球—矿床学]