鄂尔多斯盆地南部彬县-宜君地区中生界油气地质特征及勘探前景

Petroleum Geologic Features and Exploration Prospect of Cenozoic in Binxian-yijun Area in the South of Erduosi Basin

彬县－宜君地区位于鄂尔多斯盆地南部伊陕斜坡与渭北隆起的过渡部位。延长组深湖－浅湖亚相暗色泥岩、页岩（油页岩）厚度大，有机质类型好，有机质丰度和成熟度高，生油条件好；长２＋３油层组及长６油层组上部的河口坝、远砂坝、浊积砂及侏罗系的古河道砂是主要的储层类型；纵向上多套生储盖组合及多种圈闭类型为油气富集提供了有利条件；因此，本区中生界油气勘探前景十分广阔。认为：东南部为油气运聚的主要指向，且为有利储集相带及局部构造发育区，是下一步油气勘探的重点部位，岩性－构造复合圈闭是主要的勘探类型。

Binxian-Yijun area is located in the transition zone between Yixia slope and Weibei uplift in the south of Erduosi basin. The dark mudstone and shale (oil shale) of deep lake - shallow lake subfacies in the Yanchang Formation have large thickness, favorite organic mater type, high organic abundance and maturity and favorite hydrocarbon generation conditions. The mouth bar, distal bar, turbidite sandstone and paleochannel sandstone of Jurassic in T3Y4 and the upper of layer Chang 6 are the main reservoir types. The multiple source-reservoir-cap rock combinations in vertical and the multiple trap types provide favorable conditions for enrichment of hydrocarbon. Thus petroleum exploration prospect is bright in Cenozoic in this area. Favorable reservoir facies tracts and local structures develop in the southeast the main directional area of hydrocarbon migration. Lithologic-structural combination traps are the main exploration types.