陕北斜坡中部TBC地区侏罗系延安组延10与延9沉积相研究

On the sedimentary Facies of Yan-9 and Yan-10,in Yan'an Formation,Jurassic,in TBC Area of Central Section ofthe Shanbei Slope,Ordos Basin

沉积相分析是研究砂体分布进而寻找油藏富集区的关键技术,对于油田勘探开发具有重要的意义。本研究区位于鄂尔多斯盆地西南部吴旗县境内。从测井资料的详细分析入手,结合岩心观察、描述以及区域地质资料对该地区进行了沉积相的判识与标定,确定在侏罗纪初期主要为河流相沉积,到延9期逐渐发展成为河湖三角洲相沉积,并进行了亚相和微相的划分。

The analyzing of sediment index is the key technology to research the distribution of sand as to explore the oil-rich area, which is fairly meaningful to the oil exploration. This research area locates in the Wuqi county in the Ordos basin. To start with the analyzing of the well survey materials, according to the observation and description of the core, and with studying of the reginal geological materials, we give a definition and demarcation of the sediment index in this area. We define that it is manly river sediment in Jurassic, towards the Yan-9, it gradually turned into river and lake delta sediment. We also distinguished the sub-facies and micro-facies.