摘要
通过常规矿物成份分析、石英阴极发光、重矿物特征、古流向和砂体展布特征研究等方法,对鄂尔多斯盆地北部盒8气层组进行了物源分析。结果显示,盆地北部碎屑物质受到阴山古陆控制,太古界和元古界变质岩系为主要母岩类型,西北、北部和东北三个物源方向为研究区主要的物源方向。古物源与沉积体系具有良好的空间配置关系,典型相标志分析表明,盒8段研究区主要为近源陆相河流沉积体系,包括西部陡坡型砂砾质辫状河沉积、中部缓坡型砂质辫状河沉积以及东部的多河道低弯度曲流河沉积。高能水道心滩为研究区最有利的储集砂体,其次为边滩沉积。物源和沉积相特征的研究为储集相带预测,储层评价以及勘探部署奠定了基础。
The types of the parent rocks and directions of sediment supply are discussed on the basis of the types and compositions of the sandstones,cathodoluinescence image of quartz,heavy mineral assemblages,geochemical and palaeogeographic framework during the deposition of the 8th member of the Xiashihezi formation in the northern ordos basin.The results of from this study have disclosed that the classical debris in the northern ordos basin is mainly controlled by yinshan old land,the main sedimentary provenance of the 8th member of the Xiashihezi formation was from the archaean and proterozoic metamorphic rocks,and three sources are detailed divided which come from north-west,north and north-east.There are good spatial combination of paleoprovenance and depositional.Studies of the typical sign shows nature of proximal continental facies of fluvial depositional systems in the studied area,including scarp braided-stream of sand and gravel deposits in the west,flat gradient braided-stream of sand deposits in middle and meandering stream sediment in the east.The high energy watercourse channel bars are the most favorable reservoir,secondly are point bar deposits.The study of provenance and sedimentary laid a foundation for the anticipation of advantageous facies belts,evaluating reservoir and exploration deployment.
出处
《物探化探计算技术》
CAS
CSCD
2010年第1期41-47,118-119,共7页
Computing Techniques For Geophysical and Geochemical Exploration
基金
国家自然科学基金(40602012)
关键词
物源分析
沉积特征
鄂尔多斯盆地
盒8段
provenance analysis
sedimentary characters
the ordos basin
the 8th member of Xiashihezi formation
