ANALYSIS OF HIGH-RESOLUTION SEQUENCE STRATIGRAPHY AND STUDY OF DEPOSITIONAL SYSTEMS IN THE MALING OIL FIELD, ORDOS BASIN
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摘要: 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。Abstract: 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.
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图 1 研究区构造位置图
Ⅰ.天池-环县坳陷; Ⅱ.鄂尔多斯西缘逆冲推覆带; Ⅲ.六盘山压剪盆地; Ⅳ.北祁连褶皱系
Figure 1. Tectonic location map of the study area
图 2 岭215井高分辨层序地层旋回划分
Figure 2. Cycles of high-resolution sequence st ratigraphy of well Ling215
图 4 研究区高分辨率层序划分剖面图
1.沙坝; 2.天然堤; 3.决口扇; 4.泛滥平原; 5.沼泽; 6.转换面; 7.心滩; 8.河道沉积
Figure 4. Section of high-resolution sequence partitioning of the study area
图 5 延8段晚期沉积微相展布图
1.物源方向; 2.沙岩尖灭线; 3.岩性界线; 4.井位、井号; 5.层序地层格架测线方向
Figure 5. Distribution of sedimentary microfacies at the late stage of the Yan 8 period
图 6 延8段早期沉积微相展布图
1.物源方向; 2.沙岩尖灭线; 3.岩性界线
Figure 6. Distribution of sedimentary microfacies at the early stage of the Yan 8 period
图 7 延8段中期沉积微相展布图
(图例同图 6)
Figure 7. Distribution of sedimentary microfacies at the middle stage of the Yan 8 period
表 1 沉积微相的垂向模式
Table 1. Vertical pattern of sedimentary microfacies
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