Urxun Northern Sub-sag in Hailar Basin is a dustpan-shaped fault depression, faulting to the west and overlapping to the east, and the developed steep and gentle slopes control the deposition and reservoir distribution. In order to determine the characteristics of upper high-yield sand body sedimentary reservoirs in Sand Group I (TⅠ) in Tongbomiao Formation and clarify the distribution rules of high-quality sand bodies, a systematic study was conducted on the sedimentary type, sedimentary characteristics and sedimentary model of upper sand body of Oil Group I (TⅠ) in Tongbomiao Formation according to lithofacies, logging facies, seismic facies characteristics, grain size analysis, etc. The results of the study showed that the upper sand body of Tongbomiao TⅠ in the study area was mainly developed with sublacustrine fan deposition, and two sedimentary patterns, namely gravel-rich sublacustrine fan and sand-rich gravel bearing sublacustrine fan, were established through the study of the palaeogeomorphic characteristics, source supply background and triggering mechanism. During the strong tectonic movement in the late period of Tongbomiao Formation, the gravel-rich sublacustrine fan was developed with steep slope and controlled by faulting, while the sand-rich gravel bearing sublacustrine fan was developed with gentle slope and controlled by faulting and gravity. According to the existing exploration evaluation, the gravel-rich sublacustrine fan was considered to be the main target area, and the reservoir accumulation mechanism should be further studied to optimize the targets for the sand-rich gravel bearing sublacustrine fan. The research results have effectively promoted the optimization of favorable reservoirs in the Tongbomiao Formation of Urxun Northern Sub-sag, as well as the deployment of well positions. After further evaluation and optimization of the two types of sublacustrine fans, the available reserve is expected to be 500×104t. There is much for reference of the study results for further oil and gas exploration and development of Tongbomiao Formation.
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