Sedimentary characteristics of the Jurassic in western north margin of Qaidam Basin
Liu Xin1,2, Zhu Shifa1,2, Du Jianjun3, Liu Chenglin2,3, Qin Yi1,2, Zhang Jiatang1,2
1 State Key Laboratory of Petroleum Resources and Prospecting,China University of Petroleum(Beijing),Beijing 102249; 2 College of Geosciences,China University of Petroleum(Beijing),Beijing 102249; 3 Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081;
Abstract：The medium-small basins including Suhai Hu Basin,in north margin of Qaidam Basin,are potential strategic replacement fields of oil and gas resources in western China,and the preliminary work has revealed that Mesozoic source rocks developed in western north margin of Qaidam Basin have a certain exploration potential. It is essential that the analysis of sedimentary characteristics and environments is of great significance to the study of the distribution of source rocks and effective reservoirs. However,up to now,the little cognition of the sedimentary characteristics and environments has restricted the further oil-gas exploration work in this area. Through a series of technical means,such as outcrop observation,drilling data and geochemical data analysis,it is the sedimentary systems and environments in Jurassic that have been studied preliminarily. All of those will support the further oil-gas exploration. In the study,fan delta and lake depositions were developed in Suhai Hu Basin in the Early and Middle Jurassic,and the dominant braided river facies were developed in the Late Jurassic. Meanwhile,during Jurassic Period the sedimentary provenance probably came from the northern Qilian Mountain. In the Jurassic Period,the delta-marsh-lacustrine depositional system,containing rich coal seams,was well developed in the southern margin of Sertengshan Mountain,and the sedimentary provenance came from the northwestern and northeastern areas. In Lenghu area,the deep to semi-deep lacustrine deposits were developed in the Huxishan Formation in the Early Jurassic,and the sedimentary scource provenance probably came from the nearby Altun Mountain. According to the geochemistry analysis of mudstone samples,rocks in the study area mainly form in reduction environments,and different samples contain the similar distribution patterns of REE. The analysis of tectonic-sedimentary evolution shows that the western north margin of Qaidam Basin was on the initial rift stage in the Early Jurassic,and the sedimentary center of the lacustrine basin was located in Lenghu area. In middle age of the Middle Jurassic,corresponding to the Member 4 of Dameigou Formation,the interior of Suhai Hu Basin was rifted,while the sedimentary center was moving toward to east. Afterward, corresponding to Member 7, a big lacustrine basin was formed due to lake flooding in this area. The source rocks of Jurassic were mainly developed during the rising stage of the lake level when the Member 5 to Member 7 of Dameigou Formation deposited.
Liu Xin,Zhu Shifa,Du Jianjun et al. Sedimentary characteristics of the Jurassic in western north margin of Qaidam Basin[J]. JOPC, 2017, 19(4): 595-608.
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