Mesozoic-Cenozoic Structural Evolution in Qaidam Basin and Its Control Over Oil and Gas
Xu Fengyin1, Yin Chengming1,2, Gong Qinglin3 and Shen Ya3//1 PetroChina Qinghai Oilfield Company, Dunhuang City, Gansu Province 736202; 2 Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou City, Guangdong Province 510640; 3 CNPC BGP, Zhuozhou City, Hebei Province 072751
Based on the comprehensive analysis of regional structure background, boundary conditions, basement properties, structural movement, unconformable surface, stratigraphic distribution, sedimentary characters, structural evolution history, it is considered that the Miozoic-Ceozoic structural evolution of Qaidam Basin has undergone two structural cycles of extension and compression, which can be divided into four evolution stages including the Early to Middle Jurassic extensional rift and depression stage, the Late Jurassic to Cretaceous compression depression and uplift stage, the Paleocene(Lulehe age) to Early Miocene(Shangyoushashan age) integer compression depression and the western Qaidam Basin regional pull-apart feeble rift stage, as well as Late Miocene(Shizigou age) to Quaternary compression inversion stage. The basin structural evolution controls the distribution and evolution of hydrocarbon resource rocks, the formation of traps, as well as the migration, accumulation and preservation of oil and gas, and further controls the distribution of oil and gas.
【CateGory Index】： P618.13