Abstract：The sandstones in the Lower Member of the Jurassic Zhiluo Formation in northeastern Ordos Basin has been recognized as major reservoirs of uranium in northeastern Ordos Basin. Although previous studies on the sedimentology of the uranium-bearing sandstones in the basin have been usually focused on regional distribution of the uranium-bearing sandstones in northern Ordos Basin received very few attention. Based on large quantities of well data and outcrop measurements in this study, the Lower Member of Zhiluo Formation is divided into two sub-members (J2z1-1, J2z1-2) in northern Ordos Basin. The main types of sedimentary facies identified in the Zhiluo Formation include fluvial facies and deltaic facies. During the deposition of the lower sub-member, the main depositional facies developed include gravelly to sandy braided fluvial deposits and deltaic deposits in the northeastern part of the study area. The main depositional facies gradually changed to sandy braided and meandering fluvial deposits during the deposition of the upper sub-member. Meandering fluvial systems were widely developed during deposition of the upper member, especially toward the top of the member. This study found that the development of uranium ore is mainly controlled by factors such as material composition of the source rock, distribution and evolution of favorable depositional systems, and climate condition. The analysis of facies and the development of the depositional model of the Zhiluo Formation could potentially have important applications for the exploration of uranium deposits in northern Ordos Basin.
Xue Rui,Zhao Junfeng,Yan Zhandong et al. Sedimentary characteristics and evolution of the Jurassic Zhiluo Formation in northern Ordos Basin[J]. JOPC, 2017, 19(6): 999-1012.
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