通过岩心和薄片观察,结合测井资料,综合古沉积格局分析,系统总结了鄂尔多斯盆地靖边气田北部奥陶系马五7亚段沉积微相类型,并选取白云岩含量、石灰岩含量、颗粒白云岩含量等单因素等值线图,以单因素分析多因素综合作图法理论为指导,精细刻画了研究区沉积相平面展布特征.研究表明:①靖边气田北部在奥陶世马五7亚期具有"隆洼相间型"的古沉积格局特征;②研究区马五7亚段发育颗粒滩、白云岩坪、灰质白云岩坪和石灰岩洼地等微相类型;③颗粒滩相是优质储层发育的有利相带,主要分布在靖西台坪和靖东次隆的凸起带上.

Based on the comprehensive analysis of cores, thin sections, well logging data and paleo-sedimentary setting, the types of sedimentary microfacies of Majiagou Submember-57 of Ordovician in northern Jingbian Gas Field of Ordos Basin are systematically summarized. Furthermore, guided by the theory of single factor analysis and multi-factor synthesis mapping, single factor contour maps of dolomite content, limestone content, granular dolomite content were selected, and the plane distribution of sedimentary facies in the study area are described in detail. It is indicated that: (1) the paleo-sedimentary setting of Majiagou Submember-57 of Ordovician in the northern part of Jingbian Gas Field show the characteristics of "alternation with uplift and depression"; (2) microfacies such as grain bank, dolomite flat, limy dolostone flat, and the depression of limestone developed; (3) the grain bank is favorable microfacies for high-quality carbonate reservoirs, which mainly distributes on the platform in the western Jingbian and the secondary uplift belt in the eastern Jingbian.