Eboliang Ⅲ structure is one of the macrostructures in Qaidam Basin with trap area up to 470km2 in the Neogene Xiayoushashan Formation. In this paper,the authors studied the systematically the sedimentary environment evolution and provenance direction in Eboliang Ⅲ structure by using the new data of Wells Eshen 1,Eshen 2,and Eshen 7, which were drilled in succession at the east and west structural high points in recent three years. By synthetic analysis with petrology,palaeontology and geochemistry,some new points about the sedimentary environment evolution and provenance direction were obtained. The structure from the Shangganchaigou Age to Shizigou Age was under a deposition process with constantly deepening water, which was completely opposite to the previous viewpoint. Altun Mountains provenance provided main sedimentary clastics for Eboliang Ⅲ Structure. On this basis,the single well and multi well analysis has been developed to confirm the sedimentary evolution process,providing a theoretical basis for further exploration and deployment,and obtaining the corresponding exploration effect.
Kong Hongxi,Zhao Jian,Hou Zesheng et al. Provenance analysis and sedimentary environment evolution of the Neogene in Eboliang Ⅲ structure of Qaidam Basin[J]. JOPC, 2015, 17(1): 51-62.
