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为理清鄂尔多斯盆地延长组中部层序地层格架与有利储层分布,在岩心、测井和地震资料综合解释的基础上,利用基准面升降等高分辨率层序地层分析方法,将SQ3层序划分为5个中期基准面旋回(MSC1—MSC5),建立了高分辨率层序地层格架。高分辨率层序地层单元沉积相构成与有利储层分布研究结果表明,SQ3层序有利储集区的分布受控于层序发育位置,MSC1旋回有利储层分布于辫状河三角洲前缘中部至湖盆边缘一带,靠近湖盆中心部位薄层透镜状油藏发育;MSC2—MSC4旋回有利储层主要分布于辫状河三角洲前缘中部至湖盆中心方向,水下分流河道砂体与烃源岩呈指状交互接触,油气成藏条件最为有利。
In order to sort out the sequence stratigraphic framework and favorable reservoir distribution in the central Yanchang Formation of Ordos Basin, based on the comprehensive interpretation of core, well logging and seismic data, using the high resolution sequence stratigraphic analysis method such as datum elevation, the SQ3 layer The sequence is divided into five medium-term basal plane cycles (MSC1-MSC5), and a high-resolution sequence stratigraphic framework is established. Sedimentary facies formation and favorable reservoir distribution in high-resolution sequence stratigraphic units indicate that the distribution of SQ3 sequence favorable reservoirs is controlled by sequence stratigraphy and that the favorable circulation of MSC1 is distributed in the middle of the braided river delta front To the edge of the lake basin, and close to the lenticular reservoir in the central part of the lake basin. The favorable reservoirs of the swirling of the MSC2-MSC4 are mainly distributed in the central part of the braided river delta front to the center of the lake basin. The underwater distributary channel sand body and hydrocarbons Source rock finger-like interaction, the most favorable hydrocarbon accumulation conditions.