鄂尔多斯盆地盐池地区长4+5储油层沉积相研究

The research of sendimentary facies in Chang4+5 in Yanchi area,Erdos basin

盐池地区位于鄂尔多斯盆地天环坳陷东端,是近年来勘探开发的重点区块之一。研究区长4+5储油层由台型和坡型三角洲前缘砂体组成,以岩屑长石砂岩和长石砂岩为主。本文以测井相分析及岩心观察的岩石相标志为基础,通过砂地比值分布规律、单井剖面的相序分析,对鄂尔多斯盆地盐池地区长4+5油层组沉积相类型及发育规律进行综合研究。结果表明盐池地区长4+5期的主要沉积体系属于"浅水"湖泊—三角洲沉积体系,发育三角洲前缘亚相和中扇亚相,主要微相类型包括有三角洲前缘水下分流河道、分流间湾、水下天然堤微相和中扇亚相浊积水道、浊积水道前缘、浊积水道间。根据沉积微相展布可以得出研究区的沉积模式。

Yanchi region is located in the eastern end of the Ordos Basin Tianhuan Depression, one of the key blocks for exploration and development in recent years. The Chang 4 ＋5 reservoir by the station and sloping delta front sand body composed mainly of sandstone and arkose. To logging and core observation rock flag is based on the ratio of the distribution law by sand, the phase sequence analysis of the single well profile, a comprehensive study of the Ordos Basin Yanchi 4 ＋5 reservoir Sedimentary facies types and development law . The results showed that the long Yanehi the main depositional system 4 ＋5 belongs shallow lakes - Delta and deposition system, the development of the delta front the subphase fan subfacies, the main microfacies types include underwater distrib utary channels of the delta front, shunt bay, underwater natural levee the mierofacies in fan subfacies turbidite channels, the leading edge of the turbidite channels turbidite channels. According to the the sedimentary microfacies spread can be drawn depositional model for the study area.