Abstract：Abei sag， with 600 km2 of area，is one of the most promising exploration area in northeastern Erlian Basin, Inner Mongolia. Considering the complicated geological structure of Abei sag，based on core，logging，well logging and seismic data，this paper analyzed the depositional characteristics and distribution laws of nearshore subaqueous fans in the Lower Cretaceous in northern steep slope zone of the Abei sag in Erlian Basin.The results show that the subaqueous fan and the fan-delta facies were different in lithologic series，sedimentary structure，grain size characteristics，well logging curve and seismic reflection structure，which indicated the gravity flow depositional environment.The deposition of northern steep slope zone developed large-scale nearshore subaqueous fans，and the distribution scale of the fan bodies reduced to northern provenance step by step in ascending order during the Aershan Age.The dark colored mudstones of deep lacustrine and half-deep lacustrine was formed，which the sand bodies of the near-shore subaqueous fans cut down during Tenggeer Age.It makes the study area of the nearshore subaqueous fans have superior oil and gas accumulation conditions.
Liang Guanzhong,Tan Jiancai,Wei Li et al. Sedimentary characteristics of nearshore subaqueous fans of the Lower Cretaceous in Abei sag of Erlian Basin，Inner Mongolia[J]. JOPC, 2013, 15(1): 31-42.
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