New Discussion on Isochronous Framework of Lacustrine Formation:An Example from Reservoir Es_3~(2+3) of the Gaoshangpu Oil Field in Eastern Hebei

In the recent 30 years,the theory of sequence stratigraphy,which has been applied widely in the fields of petroleum,coal,and mineral resources,develops greatly.As the theory of sequence stratigraphy makes more and more development,its limitation is being exposed:the multi-genres have different view on the sequence order,division and even the definition.Every genre has a special advantage on some problems,however they could not solve others.The uniform manipulation criterion is not easily made.The study of the amalgamation among different genres is still little.In the lacustrine formation investigation,these problems are especially serious.More and more research shows that any single sequence stratigraphy genre cannot meet the need of investigation completely.Therefore a new methodology on how to syncretize the multi-genre sequence stratigraphy is discussed in this paper.The study shows that the classic sequence stratigraphy and the high-resolution sequence stratigraphy have more advantages on the investigation deepness,systematic methods and the application scopes than others.The characters of the two sequence stratigraphy on theoretical basis,sequence order and sequence boundary also shows that there has great possibility theoretically on their syncretization.An example is taken from reservoir Es32+3 of the Gaoshangpu oil field in eastern Hebei Province to set up the isochronous formation framework on the basis of the macroscopic and microscopic characteristics.Structure patterns,sedimentary features and production reveal that the formation framework is reasonable.In a word,it is very significant theoretically and practically to amalgamate the classic and high-resolution sequence stratigraphy organically to the lacustrine formation investigation.