Structural process of buried hill formation and oil and gas accumulation law in Pre-Mesozoic of Jiyang Depression, China

A new round buried hill oil and gas accumlation exploration has been processing along with the success of Futai oilfiled in these years. The paper analyzes the buried hill structural setting and its developmental process in of Pre-Mesozoic the Jiyang depression in on the basis of structural evolution in the area of the Bohai Bay basin. It points out that two periods of uplift and downgrade and gently folds established bases for buried hill structure terrain, that the structure movement in Ind-chinese epoch improved buried hill reservoir's capability, and that the tensional block faulting formed fault block and denudated buried hill since Yanshanian period. In the Jiyang depression, the buried hill hydrocarbon reservoir haves diversity and zonation. Large-scale buried hill belt formed in Pre-Mesozoic is the advantaged area of oil and gas accumulation, but it is not an abundant area, and all kinds of buried hills near hydrocarbon depression are important places of prospecting.