Abstract
Based on seismic, geological, logging and mud logging data, the seismic reflection, electrical, sedimentary and production characteristics of Tongbomiao formation and Nantun formation in a depression are compared, and a set of horizons above Tongbomiao formation in a depression are studied. The results show that the original Tongbomiao formation is actually the fourth oil formation of the first member of Nantun Formation. It is a slope fan sedimentary system overlying the Tongbomiao formation and is a lithologic reservoir. This set of strata is mainly distributed in the steep slope break zone of the basement uplift area. Because it is the same strong reflection axis as Tongbomiao strata in the earthquake, it is difficult to distinguish them. It has been mistaken for Tongbomiao strata for a long time. The re-recognition of this set of reservoirs is of great significance for searching for lithologic reservoirs, tapping the remaining potential of the developed fault block structures at low positions and improving the effect of water injection development.
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