鄂尔多斯盆地“崆峒山砾岩”成因初步分析  

ORIGIN ANALYSIS OF THE "KONGTONG CONGLOMERATE" IN ORDOS BASIN

作　　者：刘化清[1] 李相博[1] 白云来[1] 冯明[1] 房乃珍[1] 廖建波[1] 

机构地区：[1]中国石油勘探开发研究院西北分院,甘肃兰州730020

出　　处：《天然气地球科学》2006年第5期668-671,共4页Natural Gas Geoscience

基　　金：中国石油天然气股份公司"鄂尔多斯盆地中生界石油勘探目标优选评价"项目(编号:060106)资助

摘　　要：“崆峒山砾岩”是延长组在盆地西缘的相变产物,可能形成于延长组中晚期(长7-长1期),对应于鄂尔多斯西南缘前陆盆地形成期。其砾石成份以石灰岩砾石和砂岩砾石为主。通过与邻区前三叠系野外露头追踪对比,发现“崆峒山砾岩”中的石灰岩砾石与中奥陶统三道沟组灰岩特征相似,而石英砂岩砾石则与二叠系山西组砂岩特征相近,进一步的微观岩石学特征、稀土元素及微量元素特征对比结果证明了这一点。The usually called ＂Kongtong Conglomerate＂, possiblely aged middle-late of Late Triassic, is the facies change sediment of the Yangchang formation in the west margin of Ordos basin, and its component are mainly pebbles of limestone and sandstone. Outdoor investigation show that these pebbles resemble the limestone of the middle Ordovician Sandaogou formation and the sandstone of the lower Permian Shanxi formation separately. Further studies of the micro-petrography, the rare earth elements （REE）and the microelements also demonstrate the approximate result.

关 键 词：崆峒山砾岩 延长组 物源 三道沟组 山西组 长7期 

分 类 号：TE122.2[石油与天然气工程—油气勘探]