Abstract: Lots of exploratory wells were drilled around the slope zone of Structure 428 in the past two years, and significant discoveries were made in Paleogene reservoirs. However, the structural trips for next drilling and exploration were very limited. In order to clarify the exploration potential of the area, comprehensive study was done on regional structure-sedimentary evolution features, from the perspective of regionalstereoscopic exploration. The control of structural evolution to sedimentary patterns and their distribution range was analyzed, and its effect on hydrocarbon accumulation was also discussed. On the basis of establishing regional sedimentary patterns, the hydrocarbon reservoir accumulation regulation of the area was clarified. It was believed that a large scale structure-lithologic hydrocarbon reservoir existed under the second member of Paleogene Dongying Formation, and oil and gas was mainly controlled by the development situation and distribution range of reservoirs under regional mudstone cap rock. The establishment of the sedimentary pattern god rid of the constraint of the idea of pure exploration of structural reservoirs. It was proposed that the exploration idea of structural-lithologic reservoir be set for the slope zone of Structure 428. The establishment of hydrocarbon accumulation pattern expanded the exploration potential of the area and provided technical support for next overall exploration evaluation of hydrocarbon reservoirs in the area

Key words: Bozhong sag, Shijiutuo swell, Structure 428, hydrocarbon accumulation regulation, complex reservoir