鄂尔多斯盆地中部古地貌油藏类型及勘探前景

Types and exploration prospects of palaeo-geomorphic reservoirs in central Ordos Basin

鄂尔多斯盆地中部侏罗系油藏得到重大突破,在区域地质背景研究基础上,通过分析研究区的油气藏特征来确定其油藏成藏模式,并建立有利区预测筛选原则,进行有利区评价与预测。研究结果表明:基于研究区不同层位、不同井区油气藏特征的分析,发现该区侏罗系油藏的主导要素为构造要素;研究区主要发育斜坡、河间丘、古河和高地4种古地貌单元;根据“斜坡带的构造高点、古河的构造高点、古高地中的有利聚集单元”这一筛选原则建立有利区分类标准,分别进行了研究区富县组、延10及延9有利区预测。

A major breakthrough has been made in the Jurassic reservoir in the central Ordos Basin.Based on the study of regional geological background,the reservoir formation model is determined by analyzing the characteristics of the reservoir in the study area.The principle of prediction and screening of the favorable area is established to evaluate and forecast the favorable area.The results show that based on the analysis of reservoir characteristics of different strata and different well areas in the study area,it is found that the dominant factors of Jurassic reservoirs in this area are structural factors.There are four types of palaeo-geomorphic units in the study area,slope,river hill,ancient river and highland.According to the selection principle of"tectonic high point of slope belt,tectonic high point of ancient river and favorable aggregation unit in ancient highland",the classification standard of favorable areas is established,and the favorable areas of Fuxian formation,Yan 10 and Yan 9 in the study area are predicted respectively.