以鄂尔多斯盆地靖边气田东北部统5 井区马家沟组马五段上部地层为对象, 研究了高分辨率层序地层对沉积微相和储层在垂向上分布的控制作用。马五_{1— 4} 亚段构成了一个长期基准面下降半旋回, 其又可划分为5 个中期基准面沉积旋回及多于26 个短期基准面沉积旋回。研究结果表明: 长期基准面旋回对统5 井区乃至靖边气田的马五_{1— 4} 亚段沉积微相和储层的控制作用是概略性的; 中、短期基准面旋回控制着陆表海台地碳酸盐潮坪沉积微相在垂向上的细微变化, 因而也控制着古风化壳型孔洞白云岩储层在垂向上的分布。该项研究成果可推广至其它地区相似的地层和储层研究。

The control of high resolution sequence stratigraphy on the vertical distribution of sedimentary microfacies and reservoirs in upperMa 5 member of Majiagou Formation in Tong 5 well block of Jianbian Gas Field in Ordos Basin is studied. Ma 5 _{1- 4} submember is an asymmetric long-term base level cycle which can be divided into five middle-term base level cycles and more than 26 short-termbase level cycles. The study result shows that the sedimentarymicrofacies and reservoirs of Ma 5 member of Majiagou Formation in Tong 5 wellblock of Jingbian Gas Field are probably dominated by long-term base level cycle. The control action of middle-term and short-term base level cycles on the distribution of sedimentary microfacies and reservoirs is distinguished. Middle-term and short-term base level cycles control the vertical subtle change of sedimentary microfacies of carbonate tidal flat in continental sea tableland, and control the vertical distribution of vugular dolomite reservoir ofweathered crust. It is feasible to divide the cycles ofMa 5 _{1- 4} by high resolution sequence stratigraphy. The achievement of this research can be applied to the analogous reservoir studies in other areas.