Abstract: Secondary oil pools in middle-shallow layer of Junggar Basin center are controlled by location and scale of Paleoreservoir.
The paper reveal adjusting and controlling effect for second oil pool on Paleo-reservoir and hydrocarbon accumulation
due to formation and evolution of Chepaizi—Mosuowan Paleo-uplift. Starting with well logging，seismic，oil，gas and water data，
using GOI of fluid inclusions，oil-water interfaces of Paleo-reservoir are identified. Based on restoration of Paleo-structure，
areas of Paleo-reservoir are identified by types of anticline oil pools. Consulting parameters of proven Paleo-reservoir，the
scales of Paleo-reservoir were identified by distribution and thickness of sand bodies. Monocline was formed after tilting from
south to north in Junggar Basin. Paleo-reservoir was destroyed. Considering comprehensively factors of structure，fault，unconformity
and sandbodies，the directions and paths of hydrocarbon migration and accumulation and the developing areas of
secondary oil pools are identified. The main exploration objects should be middle-shallow layer of lithologic and stratigraphic
oil reservoir and exploration direction should be from the“bridge”to the slope zones，which changes the idea of looking for
litho-structural reservoir and thus guided the discovery of Mo 17.

Key words: Junggar Basin, Chepaizi—Mosuowan Paleo-uplift, Paleo-reservoir, secondary oil pool, lithologic and stratigraphicoil reservoir