【摘要】 对于鄂尔多斯盆地东北部主力含层段二叠系山西组尤其是山2段的沉积相研究众说纷纭,不同的观点导致对各个沉积体系内部的砂岩展布解释与砂层对比产生了很大差异,进而加大了高效砂体分布预测和勘探部署的难度。为此,在前人研究的基础上,结合测井、地震、岩心、露头等资料,对该区山西组沉积相进行了综合研究。结果指出,河流冲积作用是控制鄂尔多斯盆东部高效储层形成与分布的基本因素,进而提出湿地—强侵蚀限制性河道下切谷充填沉积体系的新观点,并提出了相应的沉积模式和勘探思路。更多还原

【Abstract】 There is much disagreement over the sedimentary facies of the Permian Shanxi Formation, especially its second member, which is the main pay zone in the northeastern part of the Ordos Basin, leading to great variations of the interpreted sandbody distribution and sandstone correlation results for each sedimentary system, thus further increasing the difficulties of prediction of high quality sandbodies and exploration deployment. The sedimentary facies of the Shanxi Formation in this area is comprehensively studied based on previous understandings and in combination with the logging, seismic, core and outcrop data. The results show that fluvial outwash is a fundamental factor controlling the formation and distribution of the high quality reservoirs in the eastern Ordos Basin. A new sedimentary system concept of wetland-strong erosion-restricted channel incised valley fill is proposed and the corresponding sedimentary models and exploration directions are presented.更多还原