Abstract:

Over the past decade, Yinggehai basin has been in a trough period of exploration. Based on the comparative study method, the formation and evolution mechanisms between Yinggehai basin and Jiyang depression have been analysed. Studies have shown that the two have many similarities: Both of which are controlled by large-scale after the first L-dextral strike-slip fault. The tectonic evolution experienced rift, rift-depression transform period, depression. Developed multiple deposition cycles，deposition and subsidence centers migrated. Depositional systems are diversity. Both have abnormal formation pressure. Therefore, using Jiyang depression successful experience in hydrocarbon exploration for reference to guide Yinggehai basin gas accumulation study will open up a new prospect for gas exploration in Yinggehai basin.

Key words: formation mechanism, sedimentary characteristics, Yinggehai basin, Jiyang depression, petroleum exploration