Abstract:

Oil-bearing horizons of the drape anticline oilfields in the Bozhong depression are mainly the Neogene Minghuazhen and Guangtao formations,and they are mainly distributed in structures such as salient and low sa-lient.The Bozhong kitchen is the major hydrocarbon source for PL19-3,QHD32-6 and CFD11-1 oilfields in the Bozhong depression.The drape anticline oil/gas fields generally have the genetic features such as being adjacent to hydrocarbon kitchen,quality reservoirs,good reservoir-seal combinations,favorable structural locations and excellent carrier systems.In combination with the analysis of the factors resulting in the failure of exploratory wells on the salient and low salient structures,we believe that the analysis of hydrocarbon migration conditions is the key to searching for large drape anticline oilfields in the Neogene,while the analyses of reservoirs and reservoir-seal combinations are the focus in the Paleogene.

Key words: hydrocarbon kitchen, carrier system, large drape anticline oilfield, Bozhong Depression