摘要
鄂尔多斯盆地东部地区上古生界天然气成藏地质条件优越，气藏埋深浅，勘探成本低，是继榆林、鸟审旗、苏里格气田之后又一个重点勘探区。本文根据有关资料，将盆地东部上古生界沉积体系划分为冲积体系、湖泊三角洲体系、河控海相三角洲体系、障壁海岸体系和开阔海碳酸盐岩台地体系，探讨了该地区的岩相古地理演化与有利储集相带展布。研究结果认为三角洲平原分流河道和三角洲前缘水下分流河道砂体分布层系最多，横向叠合连片范围大，是该区最有利的储集相带。研究区北部东胜-准格尔旗-神木-瑶镇一带，是最有利储集相带分布区。
The geological condition of pool-forming of upper Paleozoic in eastern Ordos basin is excellent, further more, the burieddepth of gas reservoirs is shallow, therefore it＇s exploration cost of natural gas is low. For all these reasons, eastern Ordos basin is an important exploration area after Yulin.Wushenqi and Sulige gas filed exploration. Based on the relative data, the depositional system of Upper Paleozoic in eastern Ordos basin was determined as five types： fan system, lacustrine delta regime, fluvial-dominated marine delta regime, barrier-coast system and carbonate rock platform in open sea system. At the same time, this paper also systematically studied the evolution of lithofacies palaeogeography .distribution of the favorable reservoir zone in Upper Paleozoic, eastern Ordos basin. After careful research, it is shown that the inter-distributary sand bodies deposited in delta plain and front were the most favorable reservoir zone in this area owing to it＇s widespread superposing, the best distribution area of favorable reservoir zone is Dongsheng-Zhungeerqi-Shenmu-Yaozhen region.
