鄂尔多斯盆地中部马五_1亚段高分辨率层序地层格架中风化成岩模式和储层特征  

Diagenesis Model and Reservoir Characteristics within High Resolution Sequence Stratigraphic Framework in the Mawu-1 Submember in Ordos Basin,China

作　　者：李儒峰[1] 鲍志东[1] 

机构地区：[1]石油大学盆地与油藏研究中心,北京昌平102200

出　　处：《沉积学报》1999年第3期390-396,共7页Acta Sedimentologica Sinica

基　　金：石油大学基础研究基金

摘　　要：以层序地层学理论为指导，研究了鄂尔多斯盆地中部奥陶系风化壳储层的层序地层特征，建立了马五１亚段的高分辨率层序地层格架，在其内识别出了４ 个准层序；通过建立海平面变化与风化成岩（ 岩溶） 作用的关系模式，从成因上阐明了层间岩溶和后期高级别的风化成岩（ 岩熔） 作用的发生过程和控制因素，揭示了在碳酸盐岩高分辨率层序地层格架中，不同级别的海平面变化周期控制着不同级别的沉积层序和风化成岩（ 岩溶） 作用；分析了准层序与储层物性的关系，认为在鄂尔多斯盆地中部奥陶系风化壳储层中，准层序界面控制着层间岩溶的发育，是影响马五１ 亚段风化壳储层性质的主要因素。Based on the theory of sequence stratigraphy, the sequence stratigraphic characteristics of Ordovician weathering residuals in central Ordos Basin were studied, and the high resolution sequence stratigraphic framework for the Mawu-l submember was established, in which 4 parasequences, i.e., Mawu1-1, Mawu1-2, Mawu1-3 and Mawu1-4 were identified. Generally, the parasequence sets of Mawu-l submember formed at the descent stage of sea-level, when the frequent change of sea-level resulted in multiple marines flooding surfaces and transgressive surfaces, and the deposits mainly consist of abnormal salinity possessing gypsum flat rocks. A parasequence may include one or more weathering-diagenesis cycles resulted from the change of sea-level. The top erosion surface of a parasequence corresponds to the maximum descent stage of sea-level. The relationship pattern between sea-level variation and weathing-diagenesis (karstification) was set up in this paper. The processes and controlling factors for inter-layer karstification and the weathering-diagenesis (karstification) at the later stage were presented from the genesis point of view. It was revealed that in carbonate high-resolution sequence stratigraphic framework, the sea level varying periods of different hierarchies controlled the sedimentary stratigraphy and weathering-diagenesis (karstification) of different hierarchies. Thus the multi-stage and multi-cycle characteristics of carbonate weathering residuals were determined. Therefore, the establishment of weathering-diagenesis pattern for parasequeces of Mawu1 submember is useful for further understanding of distribution pattern of weathering residuals, and for the effective prediction of weathering-crust reservoirs. The relationship between parasequences and reservoir characteristics were also analyzed. It was declared that reservoir characteristics of prapasequences 1 to 4 are integrated reflection of sedimentation and diagenesis. The influences of parasequence boundaries on the weathering-crust reservoir of

关 键 词：鄂尔多斯盆地 层序地层 储层 成岩模式 储层 

分 类 号：P618.130.2[天文地球—矿床学] P534[天文地球—地质学]