From section by section analyses of strata sedimentary facies, rhythmite division and study on salt basin sedimentary characteristics have recognized the sedimentary formation of shallow lacustrine lagoon evaporite.
This paper summarized the two pilot test in air injection into the S ⅱ~(7 + 8) sand member (positive rhythmite) in the north well pattern in the closed well spa - cing pilot test area during the late period in waterflooding.