摘要
通过沉积学、层序地层学和岩相古地理学的分析方法,对鄂尔多斯盆地东北部地区二叠系上、下石盒子组碎屑岩物源区、层序地层格架和砂体展布规律进行分析。鄂尔多斯盆地东北部地区石盒子组砂岩碎屑颗粒矿物学及石英阴极发光特征显示,其母岩主要为变质岩,这与盆地北部阴山古陆大量出露的太古代变质杂岩相一致;沉积学特征表明,研究区上、下石盒子组均为超长期旋回,下石盒子组包含5个长期旋回,而上石盒子组包含4个长期旋回,每个长期旋回包含2个中期旋回,表现为河流-三角洲沉积环境,新建立的古地理图与砂体的三维模型揭示了在盆地演化历史中浅湖相带和三角洲相带的迁移过程。综合分析认为,二叠纪鄂尔多斯克拉通陆内坳陷盆地东北部主要接受北部相对较高的阴山古陆物源输入,研究区内分别发育东、西部的河流-三角洲系统,鄂尔多斯盆地东北部具有北高南低、相对平坦的缓坡古地貌特征,为探讨该区域能源成藏特征及勘探提供了理论支撑。
By the analysis method of sedimentology,sequence stratigraphy and lithofacies palaeogeography,the provenance,sequence stratigraphic framework and sand bodies distribution of the Shihezi Formation of Permian in the northeastern Ordos Basin were analyzed.The debris particles of sandstones and CL images of quartz of the Shihezi Formation in the Northeastern Ordos Basin indicated that the parent rocks might origin from metamorphic rock mainly.It coincided with the Archaean metamorphic complex of Yinshan terrane.It showed that the Lower Shihezi Formation had 5 long-term cycles and the Upper Shihezi Formation had 4 long-term cycles.The sedimentary system of the Shihezi Formation is a river-delta depositional system.The new paleogeographic map and the three-dimensional model of the sand body reveal the migration process of the shallow lake facies belt and delta facies belt in the basin evolution history.The comprehensive analysis showed that the northeastern part of the intracontinental depression in the Ordos Craton Basin mainly accepts the input of source materials of Yinshan palaeocontinent.The study area developed east and west river-delta system.The characteristics of palaeogeomorphology in northeastern Ordos Basin was higher in northern part and gentle slope,help for the exploration of energy.
作者
王安迪
密文天
陈安清
辛杰
迟瀚韬
WANG An-di;MI Wen-tian;CHEN An-qing;XIN Jie;CHI Han-tao(Sichuan Key Laboratory of Natural Gas Geology,Southwest Petroleum University,Chengdu 610500,China;Key Laboratory of Western China’s Mineral Resources of Gansu Province,Lanzhou University,Lanzhou 730000,China;Geomathematics Key Laboratory of Sichuan Province,Chengdu University of Technology,Chengdu 610059,China;Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Central South University,Changsha 410083,China;Key Laboratory of Geoscience Spatial Information Technology of Ministry of Land and Resources,Chengdu University of technology,Chengdu 610059,China;School of Mines,Inner Mongolia University of Technology,Hohhot 010051,China;School of Earth Science and Mineral Resources,China University of Geosciences (Beijing),Beijing 100083,China)
出处
《科学技术与工程》
北大核心
2019年第3期12-22,共11页
Science Technology and Engineering
基金
中国地质大学构造与油气资源教育部重点实验室开放课题(TPR-2017-13)
中南大学有色金属成矿预测与地质环境监测教育部重点实验室开放基金(2017YSJS06)
西南石油大学天然气地质四川省重点实验室开放基金(2016trqdz08)
内蒙古工业大学科学研究重点项目(ZD201322)
国土资源部地学空间信息技术重点实验室开放基金(KLGSIT2016-02)
数学地质四川省重点实验室开放基金(scsxdz201602)
兰州大学甘肃省西部矿产资源重点实验室开放课题(WCRMGS-2014-06)资助
