鄂尔多斯盆地马岭油田高分辨率层序地层分析及沉积体系研究

按照基准面旋回原理, 将马岭油田侏罗系延安组和富县组划分为2个长期、6个中期、22个短期旋回层序; 较为详细地介绍了基准面旋回对沉积相的控制作用; 长期旋回基准面的变化可以影响和控制河流种类、发育规模和相组合模式, 中期旋回的上升半旋回和下降半旋回可能发育同一种河流相类型; 在综合岩心、录井、测井及单井相的分析基础上, 识别出该区辫状河、曲流河和网状河3种沉积类型。 

ANALYSIS OF HIGH-RESOLUTION SEQUENCE STRATIGRAPHY AND STUDY OF DEPOSITIONAL SYSTEMS IN THE MALING OIL FIELD, ORDOS BASIN

Based on the theory of base-level cycles,two long-term,six medium-term and twenty-seven short-term cyclic sequences can be distinguished in the Jurassic Yan'an Formation and Fuxian Formation in the Maling oil field,Ordos basin. This paper introduces in more detail the controls of the base level on sedimentary facies.The change in base level of the long-term cycles may affect and control the types,development scales and facies association patters of streams,and the ascending half and descending half of the medium-term cycle may give rise to the same type of fluvial facies.On the basis of an analysis of cores,well records,well logs and single-well facies,three types of sediments,namely,the sediments of braided streams,meandering streams and anastomosed streams,are distinguished in this area.